Intel graphics
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Since Intel provides and supports open source drivers, Intel graphics are now essentially plug-and-play.
For a comprehensive list of Intel GPU models and corresponding chipsets and CPUs, see this comparison on wikipedia.
Contents
Installation
Prerequisite: Xorg
Install the xf86-video-intel package which is available in the official repositories. It provides the DDX driver for 2D acceleration and an XvMC driver for video decoding on older GPUs. It pulls in intel-dri as a dependency, providing the DRI driver for 3D acceleration.
If you want to use hardware accelerated video decoding/encoding on newer GPUs, install the VA-API driver provided by libva-driver-intel package also, available in the official repositories.
You may need to install lib32-intel-dri in 64-bit systems to use 3D acceleration in 32-bit programs.
Configuration
There is no need for any kind of configuration to get the X.Org running (an xorg.conf
is unneeded, but needs to be configured correctly if present).
For the list of options, type man intel
.
KMS (Kernel Mode Setting)
KMS is required in order to run X and a desktop environment such as GNOME, KDE, Xfce, LXDE, etc. KMS is supported by Intel chipsets that use the i915 DRM driver and is enabled by default as of kernel v2.6.32. Versions 2.10 and newer of the xf86-video-intel driver no longer support UMS (except for the very old 810 chipset family), making the use of KMS mandatory[1]. KMS is typically initialized after the kernel is bootstrapped. It is possible, however, to enable KMS during bootstrap itself, allowing the entire boot process to run at the native resolution.
vga
or nomodeset
from your boot configuration.To proceed, add the i915
module to the MODULES
line in /etc/mkinitcpio.conf
:
MODULES="i915"
Now, regenerate the initramfs:
# mkinitcpio -p linux
and reboot the system. Everything should work now.
Tips and tricks
Choose acceleration method
The DDX driver allows to preset your desired acceleration method. The default method is UXA, which is more stable but slower than SNA. SNA has improved performance, but still considered experimental. Check benchmarks done by Phoronix [2]. These can be found here for Sandy Bridge and here for Ivy Bridge. UXA is still a solid option, if experiencing trouble with SNA.
If you want to use the new SNA method, create /etc/X11/xorg.conf.d/20-intel.conf
with the following content:
Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "sna" EndSection
Setting scaling mode
This can be useful for some full screen applications:
xrandr --output LVDS1 --set PANEL_FITTING param
where param
can be:
center
: resolution will be kept exactly as defined, no scaling will be made,full
: scale the resolution so it uses the entire screen orfull_aspect
: scale the resolution to the maximum possible but keep the aspect ratio.
If it does not work, you can try:
xrandr --output LVDS1 --set "scaling mode" param
where param
is one of "Full"
, "Center"
or "Full aspect"
.
KMS Issue: console is limited to small area
One of the low-resolution video ports may be enabled on boot which is causing the terminal to utilize a small area of the screen. To fix, explicitly disable the port with an i915 module setting with video=SVIDEO-1:d
as you kernel command line parameter in your bootloader. See Kernel parameters for more info.
If that does not work, you may also try disabling TV1 or VGA1 instead of SVIDEO-1.
H.264 decoding on GMA 4500
The libva-driver-intel package provides MPEG-2 decoding only for GMA 4500 series GPUs. The H.264 decoding support is maintained in a separated g45-h264 branch, which can be used by installing libva-driver-intel-g45-h264AUR package, available in the Arch User Repository.
Setting gamma and brightness
Intel offers no way to adjust these at the driver level. Luckily these can be set with xgamma
and xrandr
.
Gamma can be set with:
xgamma -gamma 1.0
or:
xrandr --output VGA1 --gamma 1.0:1.0:1.0
Brightness can be set with:
xrandr --output VGA1 --brightness 1.0
Troubleshooting
Glxgears shows low performance results
glxgears
is not a benchmark tool for performance comparison between multiple systems.If you run glxgears
in order to check your system's graphics performance, you may notice it showing results around 60 FPS. For example:
[...] 311 frames in 5.0 seconds = 61.973 FPS 311 frames in 5.0 seconds = 62.064 FPS 311 frames in 5.0 seconds = 62.026 FPS [...]
That is not caused by performance regression, but because the system graphics are using vertical synchronization, which is your display's native frames per second.
Disable VSYNC
To disable VSYNC just add in your /etc/X11/xorg.conf.d/20-intel.conf
in Section "Device"
the string Option "SwapbuffersWait" "false"
.
Alternatively, set vblank_mode
to 0
in ~/.drirc
and make sure that driver
is set to dri2
:
~/.drirc
<device screen="0" driver="dri2"> <application name="Default"> <option name="vblank_mode" value="0"/> </application> </device>
Blank screen during boot, when "Loading modules"
If you are using "late start" KMS and the screen goes blank when "Loading modules", it may help to add i915
and intel_agp
to the initramfs. See KMS above.
Alternatively, appending the following to the kernel command line seems to work as well:
video=SVIDEO-1:d
Tear-free video
If you are using the SNA acceleration method, you can get rid of video tearing by adding
Option "TearFree" "true"
to the Device section of /etc/X11/xorg.conf.d/20-intel.conf
X freeze/crash with intel driver
There is a know problem with the i845G chipset, which causes that the GPU hangs after a while.
If you have issue with X crashing, or GPU hang, or problem with frozen X, then the fix may be to disable the GPU usage with the "NoAccel" option:
/etc/X11/xorg.conf.d/20-intel.conf
Section "Device" Identifier "old intel stuff" Driver "intel" Option "NoAccel" "True" EndSection
Adding undetected resolutions
This issue is covered on the Xrandr page.
See also
- http://intellinuxgraphics.org/documentation.html (includes a list of supported hardware)
- KMS — Arch wiki article on kernel mode setting
- Xrandr — If you have problems setting the resolution
- Arch Linux forums: Intel 945GM, Xorg, Kernel - performance