Talk:Intel graphics

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Revision as of 19:53, 22 March 2013 by Tomaszc (Talk | contribs) (Disable VSYNC: new section)

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Setting gamma and brightness

Intel offers no way to adjust these at the driver level. Luckily these can be set with xgamma and xrandr.

Adding acpi_backlight=vendor to the kernel boot line allows the backlight to be changed on the Intel HD 3000 via xbacklight without root access. Perhaps a note could be added to provide this option. papabean (talk) 02:40, 14 January 2013 (UTC)

acpi_backlight=vendor stopped working a few kernels ago. (No. I did not revert to be certain).

However, intel-gpu-tools in the community repository includes the intel_backlight utility which allows one to manually set the backlight level.

papabean (talk) 04:36, 11 February 2013 (UTC)

Best performance options

In my experience (i5 CPU w/ HD4000, Z77 mobo) the best performance can be had with the following options:

  • SNA acceleration method
  • Vertical sync enabled
  • TearFree option enabled
  • i915.semaphores=1 kernel option turned on

Using the ck kernel specific to the CPU architecture also seems to make the video performance more consistent, but not necessarily any faster.

Disable VSYNC

I suggest that the restoration of this entry, it was very useful

To disable VSYNC, adjust /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:

<device screen="0" driver="dri2">
   <application name="Default">
   <option name="vblank_mode" value="0"/>