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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW/SKL] GPU hangs with programs using compute shaders"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96291">96291</a>
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<th>Summary</th>
<td>[BDW/SKL] GPU hangs with programs using compute shaders
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>git
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Drivers/DRI/i965
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<th>Assignee</th>
<td>idr@freedesktop.org
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<th>Reporter</th>
<td>eero.t.tamminen@intel.com
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
<div>
<pre>Setup:
- SKL GT2
- Ubuntu 16.04:
- latest Ubuntu kernel 4.4.0-22 (upstream v4.4.8 + i915 driver from v4.6-rc3)
- GfxBench v4: <a href="https://gfxbench.com/linux-download/">https://gfxbench.com/linux-download/</a>
- Mesa from today (f87352d76966b6e4b0ab5fa9129ccd1ade0c2e7a)
Use-case:
- Start GfxBench
- Run Manhattan v3.1 test
- Run Car Chase test
Expected outcome:
- No hangs
Actual outcome:
- recovered GPU hangs and long pauses in Manhattan v3.1 output
- recovered GPU hangs and no output from Car Chase
Notes:
- I remember running these tests early this year using Mesa GL/GLSL overrides,
after CS was added for GLES, with *no* hangs i.e. this seems regression
- I get hangs also with Ubuntu's Mesa 11.2
- Hangs are compute shading related as I get hangs only with tests using CS
- SynMark CSDof tests has similar hangs, but CSCloth doesn't. CSDof requires
SIMD32 for CS, but GfxBench tests and CSCloth don't
I tested also these kernels, but they didn't help:
- Ubuntu kernel 4.4.0-2 (Upstream 4.4 with i915 from same version)
- drm-intel-nightly kernel 4.6-rc4 (right after SKL PIPE_CONTROL fix)
- yesterday's drm-intel-nightly (4.7.0-pre)</pre>
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