Difference between revisions of "Intel graphics"
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Option "DRI" "False"
Option "DRI" "False"
=== Adding undetected resolutions ===
=== Adding undetected resolutions ===
Revision as of 16:22, 28 January 2013
zh-CN:Intel Graphics zh-TW:Intel Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary wiki Template:Article summary wiki Template:Article summary end
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.
- 1 Installation
- 2 Configuration
- 3 KMS (Kernel Mode Setting)
- 4 Module-based Powersaving Options
- 5 Tips and tricks
- 6 Troubleshooting
- 7 See also
Install the 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 as a dependency, providing the DRI driver for 3D acceleration.
Hardware accelerated video decoding/encoding on newer GPUs is possible through the VA-API driver provided by package also, available in the official repositories.
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
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 driver no longer support UMS (except for the very old 810 chipset family), making the use of KMS mandatory. 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.
nomodesetfrom boot configuration.
To proceed, add the
i915 module to the
MODULES line in
Now, regenerate the initramfs:
# mkinitcpio -p linux
and reboot the system. Everything should work now.
Module-based Powersaving Options
The i915 kernel module allows for configuration via
/etc/modprobe.d/i915.conf wherein users can define powersavings options. A listing of options is available via the following command:
$ modinfo i915 | grep power
options i915 i915_enable_rc6=7 i915_enable_fbc=1 lvds_downclock=1
Tips and tricks
Choose acceleration method
- UXA - (Unified Acceleration Architecture) is the mature backend that was introduced to support the GEM driver model.
- SNA - (Sandybridge's New Acceleration) is the faster successor for hardware supporting it.
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 . These can be found here for Sandy Bridge and here for Ivy Bridge. UXA is still a solid option, if experiencing trouble with SNA.
To 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
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 or
full_aspect: scale the resolution to the maximum possible but keep the aspect ratio.
If it does not work, try:
$ xrandr --output LVDS1 --set "scaling mode" param
param is one of
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 in the kernel command line parameter in the bootloader. See Kernel parameters for more info.
If that does not work, try disabling TV1 or VGA1 instead of SVIDEO-1.
H.264 decoding on GMA 4500
The Arch User Repository. Note however that this support is experimental and not currently in active development. Using the VA-API with this driver on a GMA 4500 series GPU will offload the CPU but may not result in as smooth a playback as non-accelerated playback. Tests using mplayer showed that using vaapi to play back an H.264 encoded 1080p video halved the CPU load (compared to the XV overlay) but resulted in very choppy playback, while 720p worked reasonably well . This is echoed by other experiences .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 AUR package, available in the
Setting gamma and brightness
Intel offers no way to adjust these at the driver level. Luckily these can be set with
Gamma can be set with:
$ xgamma -gamma 1.0
$ xrandr --output VGA1 --gamma 1.0:1.0:1.0
Brightness can be set with:
$ xrandr --output VGA1 --brightness 1.0
Glxgears shows low performance results
glxgearsis not a benchmark tool for performance comparison between multiple systems.
glxgears to check system graphics performance, 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 the display's native frames per second.
To disable VSYNC, adjust
Section "Device" the string
Option "SwapbuffersWait" "false".
~/.drirc and make sure that
driver is set to
<device screen="0" driver="dri2"> <application name="Default"> <option name="vblank_mode" value="0"/> </application> </device>
Blank screen during boot, when "Loading modules"
If using "late start" KMS and the screen goes blank when "Loading modules", it may help to add
intel_agp to the initramfs. See the above KMS section.
Alternatively, appending the following kernel parameter seems to work as well:
If using the SNA acceleration method, ablate video tearing by adding the following to the
Device section of
Option "TearFree" "true"
X freeze/crash with intel driver
Some issues with X crashing, GPU hanging, or problems with X freezing, can be fixed by disabling the GPU usage with the
Section "Device" Identifier "Intel Graphics" Driver "intel" Option "NoAccel" "True" EndSection
Alternatively, try to disable the 3D acceleration only with the
Section "Device" Identifier "Intel Graphics" Driver "intel" Option "DRI" "False" EndSection
If you experience crashes and have
Option "TearFree" "true" Option "AccelMethod" "sna"
in your config file, in most cases these can be fixed by adding
to your boot parameters.
Adding undetected resolutions
This issue is covered on the Xrandr page.
Slowness after an upgrade to libGL 9 and Intel-DRI 9
Downgrade to Intel-DRI 8 and libGL 8.
Black textures in video games
Users experiencing black textures in video games may find a solution by enabling S3TC texture compression support. It can be enabled throughor by installing .
This "issue" will be fixed very soon in the newer drivers
Read more about S3TC at: http://dri.freedesktop.org/wiki/S3TC http://en.wikipedia.org/wiki/S3_Texture_Compression
One of the games that is affected by this issue is Oil Rush