Bug 107582 - Prefer render nodes instead of X to discover GPU
Summary: Prefer render nodes instead of X to discover GPU
Alias: None
Product: Beignet
Classification: Unclassified
Component: Beignet (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Zhigang Gong
QA Contact:
Depends on:
Reported: 2018-08-15 15:21 UTC by Sven Arvidsson
Modified: 2018-10-12 21:25 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Description Sven Arvidsson 2018-08-15 15:21:31 UTC
At the moment Beignet defaults to using X11/DRI to find the GPU. This makes it hard to use the integrated GPU when a discrete graphics card is used as the primary display driver. 

Beignet reports an unhelpful error message:

 DRM_IOCTL_I915_GEM_APERTURE failed: Invalid argument
 Assuming 131072kB available aperture size.
 May lead to reduced performance or incorrect rendering.
 get chip id failed: -1 [2]

and no devices are found.

The only way to get OpenCL working is by unsetting the DISPLAY variable so X isn't found, and by doing so only non-x applications can use OpenCL.

It would be better if render nodes were used by default (I think these are enabled by default since kernel 3.15?) and X11/DRI only as a fallback. 

Compiling Beignet without X11 gets rid of this problem and seems to work fine in all the environments I tried. (AMD GPU as primary with X11, Intel GPU as primary with X11, from a a headless console environment, etc.)

Possibly X11 support could be removed entirely to cut down on dependencies.

The documentation on https://www.freedesktop.org/wiki/Software/Beignet/ could use an update too. It took far longer to figure out how to get this working than I care to admit ;-)
Comment 1 GitLab Migration User 2018-10-12 21:25:24 UTC
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

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