All DKMS patches merged upstream

All Fedora/CentOS/RHEL patches that were in the DKMS build in Fedora/EPEL are now merged upstream; along with additional patches from Debian and Ubuntu.

Additions are many:

  • Inter-dependency logic between modules (spl, zfs, etc.)
  • Additional parameters for skipping creation of ram disks, running depmod, etc
  • Fix templates for package generation
  • Systemd unit file
  • Tons of fixes, especially with dkms parameters, cleanup of remaining folders and recent bash shells

There are test builds available, if you happen to use DKMS please leave some feedback. These need some testing on all supported distributions (that is RHEL/CentOS 5, 6 and 7; and Fedora 19, 20, 21), so it will stay in the testing repositories for quite some time until I get some feedback.

End of summer updates

Just came back from holiday and work travel; just in time for another batch of changes for the repositories:

  • MakeMKV has been updated to version 1.8.12.
  • HandBrake has been updated to the current development version for Fedora 20, 21 and 22. It enables now x265 by default and uses even less bundled libraries. It also uses the system libappindicator for notifications.
  • Flash plugin package has been updated to version
  • Spotify it’s now at version As announced previously in another post, the original i386 build was reverted by upstream to 0.9.4 without even notifying and it stayed locked at this version for months. As such, I completely removed i386 support for it. I’ve changed the repository page to reflect it.
  • The Nvidia Management library header and man pages (alias GPU Deployment Kit) it’s now at version 340.21, the bundled version in CUDA 6.5. It works with drivers version 340.x and up.

Most of the repositories now support both Fedora 21 and 22, including HandBrake & friends.

Also, I’m building CUDA 6.5 packages now that it has been released. Testers welcome as usual.

Steam and HandBrake repository update

The HandBrake repository has seen some updates; it now contains the current development version for Fedora 20 and later, based on feedback in the previous weeks. It contains less and less bundled libraries and now uses the GTK3 interface.

libdvdnav is now on the final 5.0.0 release. Not much changed since the previous release that contained all the fixes required to avoid the HandBrake crash while opening a DVD for scanning with the default settings.


The Steam package no longer ships a steam-noruntime subpackage, Fedora’s current system libraries diverge too much from the bundled Ubuntu runtime, and Steam refuses to start with them. Most of the games still run fine though, and nothing prevents you from running them without the Ubuntu libraries.

The package now obsoletes steam-noruntime, and it has also been pushed to RPMFusion.

Other Steam updates are for the SteamOS packages, they are now on par with the SteamOS update 126.

Fedora Nvidia drivers: OutputClass for X server 1.16, GPU deployment kit, CUDA enablement, RHEL7 kABI modules

The Nvidia repository has been updated; here is the table that lists the current versions:

Operating system
el6 / el7
f19 / f20
f21 / f22
Driver branchLong LivedShort Lived
Long Lived
Short Lived
Long Lived
Driver version340.46343.22343.22

Basic nvidia driver:

CUDA libraries and tools:

OpenGL Framebuffer Capture:

Nvidia tools:

nvidia-healthmon (x86_64)
Binary kernel
module (kABI):

DKMS kernel

aKMOD kernel

32 bit compatibility on x86_64:

GPU Deployment kit + development:


Quite a few things have changed, the packages are going towards providing the complete packaged CUDA stack. So far, only the GPU deployment kit has been inclued; and the packages allow for parallel installation with the Nvidia CUDA repositories by osboleting/updating packages as required. Here is some details on the things that have been implemented. configuration

  • Starting from Fedora 21, all driver configuration can be managed by simply adding/removing configuration snippets in /etc/X11/xorg.conf.d.
  • Use new OutputClass directive on Fedora 21 server 1.16 (and later) to load the driver and do not rely on an edited /etc/X11/xorg.conf file. This also removes editing of the xorg.conf file from the package scriptlets.
  • Add the IgnoreABI directive by default on Fedora rawhide builds.

Kernel modules

  • Add a new UDev rule in nvidia-driver-cuda for the nvidia-uvm module and make NVIDIA Files section to be loaded latest in case there are other packages providing a custom Files section (thanks Jan P. Springer for spotting these).
  • The binary nvidia-modprobe is now SETUID, but its package is no longer a mandatory requirement for the drivers, so it will not get installed by default.
  • Now that both Redhat Enterprise Linux 7 and CentOS 7 have been released, binary modules (kABI) are now provided for these distributions.

CUDA support

  • Added the GPU Deployment kit to the repository. This is constructed with NVML (NVIDIA Management Library) included with the drivers plus headers, docs and samples from a separate tarball. The separate tarball is using a different version number than the drivers. This is packaged in the nvidia-driver-NVML and nvidia-driver-NVML-devel packages. Installing these, the gpu-deployment-kit dependency provided by the CUDA repositories is preserved.
  • Along with NVML, the nvidia-healthmon package is provided to monitor TESLA GPU clusters.

Along this, there is the usual assortment of packages refinement (syntax, RPMLint, optimizations, etc.). For additional details, please see the Nvidia driver page.

If you would like to test the CUDA packages please contact me and I will point you to a repository hosting the CUDA packages.

Another batch of big updates for the repositories (Nvidia, HandBrake, Steam, etc…)

Another batch of changes for the repositories. The HandBrake repository has seen some updates:

  • MakeMKV has been updated to version 1.8.11.
  • HandBrake has been updated to the current development version for Fedora 21. It contains additional/different bundled libraries, but the situation is not that bad.
  • libdvdnav is now based on a 5.0.0 snapshot that contains all the fixes required to avoid the HandBrake crash while opening a DVD for scanning with the default settings. Removal of the flag “Use dvdnav (instead of libdvdread)” in the preferences panel is no longer required.

Please test it, I found it much more stable than the previous version. If it works, I might build it also for current Fedora releases.


Regarding the other updates:

  • The Nvidia driver is now at version 340.24 for all CentOS/RHEL and Fedora variants.
  • Nvidia Fedora 21 packages have now aKMOD support
  • Nvidia CentOS/RHEL 7 packages have now binary kABI modules, so you can install the binaries directly without relying on DKMS.
  • The CDRtools suite has been updated to version 3.01a24.
  • The Steam package has been updated to version, the same build has been pushed to RPMFusion. The repository hosted here still contains other SteamOS packages.
  • The Flash plugin package has been updated to version and Skype has been updated to version Both versions have also been pushed to RPMFusion in the form of lpf packages.
  • Spotify it’s still at version 0.9.10; as the x86_64 and i386 builds share the same data package. Upstream has updated the x86_64 build to 0.9.11 but at the same time has reverted the i386 build to 0.9.4, so all Ubuntu users will not get the update anymore. Until this is sorted out, I’m going to leave the current package versions as 0.9.10 for systems that are both 32 and 64 bit. RHEL/CentOS 7 (which is 64 bit only) has the new 0.9.11 version.

As always, any issue just let me know.

Fedora based SteamOS

Screenshot from 2014-06-09 16:39:27I’ve added the packages that make up Valve’s SteamOS customizations to the Steam package repository for Fedora. Although mostly working, some issues cannot be solved due to SteamOS being based on Debian and the main Steam client being binary only and calling specific Debian commands like dpkg.

At the current status, I will not post the packages for review on RPMFusion but will keep them hosted only here until they work a
bit better. For now, just use the packages if you want to tinker with them or help with the porting.

Parts related to PolicyKit are a bit raw, I need to convert the rules to systemd’s logind rules as this is what is used now in Fedora.

Valve improved X-Box gamepad driver for Fedora


I’ve added to the Steam package repository for Fedora an alternative kernel module for xpad, the X-Box gamepad driver. This variant contains patches created by Valve to improve the driver and its behaviour.

The module is available in both akmod (RPMFusion) and dkms package formats.

This made my 3rd party X-Box controller work without any issue in Steam games and in the Big Picture Mode interface!

I’ve added a note on Valve’s wiki and Steam forums regarding it, for installation and instructions just head to to the Steam repository page.

Complex setup with Nvidia Optimus / Nouveau Prime on Fedora 20

This is a re-edit of my previous post about using and configuring an Optimus enabled laptop in Fedora 20/21. It should work on other distributions as well.


My laptop at work is a Dell Latitude E6430. Comes loaded with features and I really like it. Among the various features there’s the fact that this is an Nvidia Optimus enabled laptop, sporting both an Intel video card and an Nvidia one:

$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108GLM [NVS 5200M] (rev a1)

This one is a muxless laptop of the worst kind: video outputs are connected only to specific chips!

Update 23rd May 2014: UEFI console (using efifb) on external monitors has been fixed with bios update version “A14″. Now the UEFI console is also rendered on external monitors if the lid is closed; so I’ve updated the guide.

LVDS (Internal panel)Intel
VGA (not usable along with the docking station one)Intel
VGA (Docking station)Intel
DVI (Docking station)Nvidia
DisplayPort (Docking station)Nvidia

So to use an external HDMI connection at home you need to drive it through the Nvidia card, it doesn’t matter if Optimus is enabled or not. I regularly use it docked with the lid closed, external keyboard and mouse and 2 external monitors connected to the VGA and DVI outputs of the docking station. Basically while I’m at the office it looks like a normal desktop computer; but sometime I need to disconnect it to go on a meeting; and sometimes I use it at home to play games as well.

Guess what? Free drivers, proprietary drivers, UEFI, UEFI secure boot, multi monitor, outputs changing on the fly… all sorts of fun! I’m impressed by the fact that it all works together.

There are four modes on which I can operate the system:

  • Optimus enabled, free drivers for both Intel and Nvidia cards (implementation is called “Prime”)
  • Optimus enabled, free driver for Intel and proprietary driver for the Nvidia card
  • Optimus disabled, free driver for the Nvidia card
  • Optimus disabled, proprietary driver for the Nvidia card

Each one has its drawbacks, so let’s explain each setup a bit. At the end of the post I’ve made a table with all the pros and cons of each solution.

My current setup is:

  • Fedora 20 x86_64
  • Kernel 3.14.4 (stock Fedora)
  • Nouveau DDX 1.0.9 (stock Fedora)
  • Intel DDX 2.21.15 (stock Fedora)
  • Nvidia proprietary drivers 337.19 (from my repository)
  • VDPAU library 0.7 (stock Fedora)
  • Mesa libraries 10.1.3 (20140509 prerelease, stock Fedora)

UEFI / legacy bios

If secure boot is enabled; there’s no way to use the proprietary Nvidia driver without fiddling with UEFI keys. The module is built separately from the kernel package; so there’s no way for it to have the same signature as the kernel.

When UEFI is enabled, the free drivers work fine and replace the efifb framebuffer driver with their own; thus giving proper modesetting at the correct resolution and a speedy and responsive terminal.

With the proprietary Nvidia driver, the efifb is not replaced; so the console still operates with it and the Nvidia driver only operates the X part. Unfortunately, using this method, the framebuffer console is really slow, the resolution is not optimal, and the EFI framebuffer is exposed onto external monitors only from bios version “A14″. Before the update, pressing CTRL+ALT+Fx jumped me to the console that is shown in the closed laptop lid on the docking station; making it pretty useless.

What UEFI could bring you is the Intel Rapid Start Technology which has been included in kernel 3.11; so make your choices depending on what you need.

Optimus disabled (Nouveau or Nvidia)

When Optimus is disabled, I can freely use the proprietary Nvidia driver or the free Nouveau driver.

Both solutions work; unfortunately performance and feature wise Nouveau cannot compete with the proprietary Nvidia driver.

My main issue is power management; with the Nvidia driver the battery lasts a lot more and the performance difference is abysmal. Nouveau performance is really poor with 3D games (especially Steam commercial ones, with Doom 3 it works fine) and there’s absolutely no power management; at least on my laptop. By playing with performance levels I was only able to overheat the card.

Another thing that does not work with Nouveau is the docking station removal. With the Nvidia proprietary driver I’m able to do the following:

– Disconnect from the docking station: output goes from the external VGA and DVI monitors to the internal LVDS display.

– Reconnect to the docking station: internal LVDS display gets shut off and output goes to VGA and DVI monitors as they were before; one next to the other. I can even close the lid and the computer doesn’t go in standby.

With Nouveau, I’m able to disconnect from the docking station but when reconnecting I need to reconfigure the monitors in their place; and after this, when closing the lid I need to wake up again the computer because it goes on standby.

With the recent Xrandr support to the proprietary drivers I don’t even need to edit che configuration file. Whether I use nvidia-settings or Gnome Displays panel the result is reflected in both implementations and preserved across boots.

Optimus enabled (Nvidia)

To configure Optimus with proprietary drivers perform the following. First of all install the proprietary driver as normal. Now edit the /etc/grub2.cfg file and remove some parameters from the kernel command line. This is required because the Intel driver still need to operate with its KMS driver. So, from this:

nouveau.modeset=0 rd.driver.blacklist=nouveau nomodeset gfxpayload=vga=normal

you should go to this:

nouveau.modeset=0 rd.driver.blacklist=nouveau

After this, edit/recreate the /etc/X11/xorg.conf file with the following contents:

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    Option "NoLogo" "true"
    Option "DPI" "96 x 96"
    # Specify Nvidia PCI device
    BusID "PCI:1:0:0"
    # Make sure X starts also when no outputs are connected to the Nvidia chip
    Option "AllowEmptyInitialConfiguration"
# Slave device
Section "Device"
    Identifier "intel"
    # Simple output, no full Intel driver
    Driver "modesetting"
    # BusID "PCI:0:2:0"
Section "Screen"
    Identifier "intel"
    Device "intel"
Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
# Make sure the Nvidia device is the first in the server
Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"

Make sure to set the correct bus ID for the Nvidia card; for instructions look in the Nvidia documentation. Make sure the integrated Intel card is using modesetting driver and not the native one.

The AllowEmptyInitialConfiguration directive in the Nvidia section is required to let X start with the Nvidia driver without any output attached to the chip, for example while using the internal LVDS monitor.

Upon reboot, you will see KMS running for the Intel card (Plymouth screen) and then the login manager appears on the Nvidia attached panels, while the Intel outputs shut off.

After logging in, you can also check that both drivers are running with the following commands:

$ lsmod | egrep "i915|nvidia"
nvidia              10411255  41 
i915                  796218  2 
i2c_algo_bit           13257  1 i915
drm_kms_helper         50652  1 i915
drm                   283747  5 i915,drm_kms_helper,nvidia
i2c_core               38656  7 drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit,nvidia,videodev
video                  19261  1 i915

To light up the other display some xrandr command is required:

$ xrandr --setprovideroutputsource Intel NVIDIA-0
$ xrandr --auto

Your Intel monitor should now have an extended desktop managed by the Nvidia card. Move windows around, and launch some commands to see that wherever you go you’re using the Nvidia accelerated driver:

$ glxinfo| grep "OpenGL version string"
OpenGL version string: 4.4.0 NVIDIA 337.19
$ vdpauinfo | grep -i string
Information string: NVIDIA VDPAU Driver Shared Library  337.19  Tue Apr 29 19:51:41 PDT 2014

Everything seems to work, except output manipulation. Xrandr, Gnome and Nvidia drivers have a different view.

Xrandr view:

$ xrandr -q | grep conn
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm panning 3360x1050+0+0
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
LVDS-1-0 connected (normal left inverted right x axis y axis)
VGA-1-0 connected 1680x1050+1680+0 (normal left inverted right x axis y axis) 474mm x 296mm

This is what I have in the Nvidia settings panel and in the Gnome Displays panel for the monitors; in one case I see only one of the external monitors, in the other one I have all monitors:

Primary monitor assignment does not work as well. I usally have the Gnome panel on the left monitor. If I try to move it from the Nvidia output I get this feedback:

$ xrandr --output VGA-1-0 --primary
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  139 (RANDR)
  Minor opcode of failed request:  30 (RRSetOutputPrimary)
  Serial number of failed request:  51
  Current serial number in output stream:  53

Putting monitor problems aside, running in this mode does not really give any benefit compared to running it with Optimus disabled and the proprietary Nvidia driver installed. Both cards are running with power management, but the Nvidia card is never shut off, so it doesn’t use less power than when running standalone.

There’s no way to turn off the card with vga_switcheroo, all libraries come from the Nvidia drivers and your desktop is being rendered by the Nvidia card.

GDM configuration for Optimus (Nvidia)

Let’s assume you want to create the above setup in GDM (Gnome Display Manager), making it run automatically the xrandr commands mentioned above.

You need to create a text file with the display name (usually “:0″) to start the commands upon Init time the appropriate GDM configuration directory:

$ cd /etc/gdm/Init/
$ cat \:0 
# Get the xrandr providers
output="$(xrandr --listproviders)"
src=$(echo "$output" | grep " Source" | head -n1 | awk '{print $NF}' | cut -d: -f2)
sink=$(echo -e "$output" | grep " Sink" | head -n1 | awk '{print $NF}' | cut -d: -f2)
# Pass provider or sink and source
xrandr --setprovideroutputsource "$sink" "$src"
# Make sure xrandr sees all the outputs
# xrandr --auto
# Do not move up. Only now xrandr shows the outputs
lvds=$(xrandr | grep -i "lvds" | head -n1 |cut -d " " -f 1)
xrandr --output "$lvds" --off
xrandr --output "$lvds" --auto

The “–off” and then “–auto” is actually redundant, but it helped in a couple of cases.

Prime enabled (Nouveau)

The Open Source implementation of this is actually called “Prime” for obvious reasons.

Here comes the juicy part. With enough maturity on the Nouveau side this would be the perfect setup. To start with this implementation; nothing is required, just install Fedora and everything should be already set up by default. Booting it shows the Plymouth logo on both outputs.

Login in the system, and check that both drivers are running:

$ lsmod | egrep "i915|nouveau"
nouveau               943445  1 
i915                  651861  4 
mxm_wmi                12865  1 nouveau
ttm                    79865  1 nouveau
i2c_algo_bit           13257  2 i915,nouveau
drm_kms_helper         50239  2 i915,nouveau
drm                   274480  8 ttm,i915,drm_kms_helper,nouveau
i2c_core               34242  7 drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit,nouveau,videodev
wmi                    18697  3 dell_wmi,mxm_wmi,nouveau
video                  19104  2 i915,nouveau

Poking around with xrandr will give you totally different outputs from the Nvidia driver:

$ xrandr -q | grep conn
LVDS2 connected 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
VGA2 connected 1680x1050+1600+0 (normal left inverted right x axis y axis) 474mm x 296mm
LVDS-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 connected (normal left inverted right x axis y axis)
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
VGA-1-1 disconnected (normal left inverted right x axis y axis)

But at least they’re consistent with the Gnome Displays panel:

For reasons I don’t understand the Nvidia card appears twice in 2 different but identical providers:

$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x96 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 2 associated providers: 2 name:Intel
Provider 1: id: 0x66 cap: 0x7, Source Output, Sink Output, Source Offload crtcs: 2 outputs: 5 associated providers: 2 name:nouveau
Provider 2: id: 0x66 cap: 0x7, Source Output, Sink Output, Source Offload crtcs: 2 outputs: 5 associated providers: 2 name:nouveau

With the tests I made, there’s no apparent difference when using one or the other. Usage of one card or the other is driven by the DRI_PRIME environment variable. If it’s set to 0, commands run on the Intel card, if it’s set to 1 they will run on the Nvidia card. For example:

$ DRI_PRIME=1 vdpauinfo | grep -i string
Information string: G3DVL VDPAU Driver Shared Library version 1.0

Or even better, to check OpenGL status:

$ glxinfo | grep -e 'OpenGL.*string.*'
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Mobile 
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.1.3
OpenGL core profile shading language version string: 3.30
OpenGL version string: 3.0 Mesa 10.1.3
OpenGL shading language version string: 1.30
$ DRI_PRIME=1 glxinfo | grep -e 'OpenGL.*string.*'
OpenGL vendor string: nouveau
OpenGL renderer string: Gallium 0.4 on NVC1
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.1.3
OpenGL core profile shading language version string: 3.30
OpenGL version string: 3.0 Mesa 10.1.3
OpenGL shading language version string: 1.30

Unfortunately the desktop is very slow, it’s rendered by the Intel driver and put on the Nvidia card for display. I’ve tried changing priority in vga_switcheroo prior to starting X, setting the DRI_PRIME=1 variable at boot, use xrandr to change the provider output source etc. to no avail; the desktop can run only on the first card or it doesn’t work. Usually I get a black screen upon GDM start.

There’s no power management as well, so the Intel card runs normally but the Nvidia one is always on and stuck in an intermediate performance level.

When docking it; I get cloned outputs on all external displays at a very low resolution. Same issue with the Optimus disabled Nouveau driver; the outputs need to be rearranged, the lid closed and the computer needs to be woken up from standby.

Prime power management (Nouveau)

Power management for automatic powerup/shutdown of cards in Optimus systems and runtime management has been introduced in kernel 3.12. Is on by default on Optimus enabled laptops and is enabled by default.

The situation has improved a lot in 3.13 and 3.14, and at least on my system it works flawlessly:

# cat /sys/kernel/debug/vgaswitcheroo/switch 
1:DIS: :DynPwr:0000:01:00.0

As you can see the second card is dynamically powered. Try to undock the system and check the status again: the second output is no longer needed so the second card shuts off:

# cat /sys/kernel/debug/vgaswitcheroo/switch 
1:DIS: :DynOff:0000:01:00.0

Now, with the laptop undocked, launch a command on the second card:

# DRI_PRIME=1 vdpauinfo | grep -i string
Information string: G3DVL VDPAU Driver Shared Library version 1.0
# cat /sys/kernel/debug/vgaswitcheroo/switch 
1:DIS: :DynPwr:0000:01:00.0

You will notice a slight delay before the command output is returned, but the card is powered on again! This is awesome. Now, after 1 or 2 seconds look again at the card:

# cat /sys/kernel/debug/vgaswitcheroo/switch 
1:DIS: :DynOff:0000:01:00.0

It’s shut off! Dock the laptop again and the monitor should come up again.

Keep in mind that powering up and down cards is a totally different things than power managing and adjusting clocks etc. for a running card. This make the Nvidia card shutdown automatically, not regulate its power levels during usage.

Dual cards can be shut down or powered up on demand through vga_switcheroo. For example, login in your system as root without X running and no outputs connected to the Nvidia chip. Look at the card status with the following command:

# cat /sys/kernel/debug/vgaswitcheroo/switch
1:DIS: :DynOff:0000:01:00.0

This will tell you that the Integrated Graphics Display (IGD) is powered up (Pwr) and that is the primary display (+), while Discrete one (DIS) is dynamically off. To turn on the secondary video card, a single command is required:

# echo > /sys/kernel/debug/vgaswitcheroo/switch
# cat /sys/kernel/debug/vgaswitcheroo/switch
1:DIS: :On:0000:01:00.0

This will power on the Nvidia card. A look at the battery will tell you now that you have half the power because the Nvidia card sucks power along the integrated Intel one.

Turn off the integrated card (IGD), and switch the framebuffer console to the discrete one (DIS):

# echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch
[  879.436727] i915: switched off
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD: :Off:0000:00:02.0

This will move the framebuffer and your shell to the other Nvidia driven monitor and shut down the Intel card. You will see the framebuffer console on the Nvidia output. Sweet, isn’t it?


A Prime enabled laptop with open source drivers does not have any configuration and does not require any manual configuration. The fact that the Nvidia card can power down itself is great and doubles my battery duration! On the screen I have KMS consoles without huge fonts and can have UEFI secure boot enabled! This is really awesome.

Unfortunately though, without proper Nouveau power management and performance improvements added to the fact that I need to reconfigure monitors everytime I move (sometime the output gets all black as well when docking); the experience is not that great. I don’t know why, but when I’m undocked and using only the LVDS internal panel, the Intel performance is fantastic. Problems arise only when it’s docked and Nouveau is enabled as well.

OptimusDisabledDisabledEnabledEnabled (Prime)
ConfigurationVery easy.Already set up.Very complexAlready set up.
Card power
Perfect!Poor performance, no power management.Nvidia card always powered up, renders for all screens.Dynamic video card switching works fine, Nouveau performance not.
Optimus card
power management
N.A.N.A.Nvidia card can't power down.Perfect!
Docking / UndockingPerfect!Manual intervention requiredManual intervention required, unreliableManual intervention required
PerformancePerfect!Pretty bad.Very good, some tearing when moving windows.Bad when using the Nvidia card for output, otherwise perfect!
Bios ConsoleVGA, no KMS.Perfect (KMS)!Perfect (KMS on Intel).Perfect (KMS)!
UEFI ConsoleUses efifb. Somewhat slow.Perfect (KMS)!Perfect (KMS on Intel).Perfect (KMS)!
UEFI secure bootCan't work.Perfect!Can't work.Perfect!

Summing up, my current choice is for the Optimus disabled setup with Nvidia drivers. I can play games, dock, undock, power management works ok and I can drive all outputs easily. And if I need to go in a meeting I don’t need to be extra cautious in shutting down virtual machines, because the system might not go up again. It’s kinda retro style when booting with the text console and battery does not last more than 3 hours, but I can bear it.

If you’re not hunger for games or 3d stuff except the usual desktop compositing, just stick with the default OpenSource drivers and components, there is no setup required and everything works out of the box. My battery charge lasts usually 6 hours on a mixed usage case.

Nvidia has started contributing to the Nouveau driver with support for the GK20A (Nvidia K1) chip and it will be merged in kernel 3.16; let’s hope it will do the same for the other chips and components.

I'm not dumb. I just have a command of thoroughly useless information.

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