Bug 99500

Summary:	Graphical Glitches when running beignet
Product:	Beignet	Reporter:	Artyom <artyomtnk>
Component:	Beignet	Assignee:	Zhigang Gong <zhigang.gong>
Status:	RESOLVED MOVED	QA Contact:
Severity:	major
Priority:	medium
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
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.

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