Bug 99500 - Graphical Glitches when running beignet
Summary: Graphical Glitches when running beignet
Alias: None
Product: Beignet
Classification: Unclassified
Component: Beignet (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium major
Assignee: Zhigang Gong
QA Contact:
Depends on:
Reported: 2017-01-23 06:52 UTC by Artyom
Modified: 2018-10-12 21:26 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Description Artyom 2017-01-23 06:52:10 UTC
When using beignet (tested 1.2.1 and 1.3.0) graphical glitches appear immediately making desktop unusable, it is even enough to run clinfo

CPU/GPU: i5-3470 with Intel® HD Graphics 2500
OS: Ubuntu 14.04 64 bit:
Kernels: Same behavior on both 4.4 and 3.13

Some of the clinfo output:

Some of clinfo output on Kernel 4.4:

  Platform Profile:                              FULL_PROFILE
  Platform Version:                              OpenCL 1.2 beignet 1.3
  Platform Name:                                 Intel Gen OCL Driver
  Platform Vendor:                               Intel
  Local memory type:                             Global
  Local memory size:                             65536
  Unified memory for Host and Device:            1
  Name:                                          Intel(R) HD Graphics
IvyBridge GT1
  Vendor:                                        Intel
  Device OpenCL C version:                       OpenCL C 1.2 beignet 1.3
  Driver version:                                1.3
Comment 1 dr.moebius 2017-12-30 12:19:51 UTC
I can observe the same behavior on ubuntu 16.04 64bit, beignet/xenial,now 1.1.1-2 amd64 and the same processor as the OP.

This happens e.g. when running `clinfo` or `gimp`, when running without opencl support, `gimp --gegl-disable-opencl`, everything works fine.

searching https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/3rd-gen-core-desktop-specification-update.pdf on page 48 you can find that this seems to be a known and unfixed bug:

Specific source-copy blitter instructions in Intel® HD Graphics 2500 and 4000 processor may result in unpredictable behavior when a blit source and destination overlap.
Comment 2 GitLab Migration User 2018-10-12 21:26:52 UTC
-- GitLab Migration Automatic Message --

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

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/beignet/beignet/issues/67.

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