Bug 110379

Summary: [CI][SHARDS] igt@kms_frontbuffer_tracking@fbc-rgb101010-draw-* - fail - Failed assertion: !mismatch
Product: DRI Reporter: Martin Peres <martin.peres>
Component: DRM/IntelAssignee: Swati Sharma <swati2.sharma>
Status: NEW --- QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: high CC: intel-gfx-bugs, swati2.sharma
Version: DRI git   
Hardware: Other   
OS: All   
Whiteboard: ReadyForDev
i915 platform: KBL, SKL i915 features: display/Other

Description Martin Peres 2019-04-10 12:13:25 UTC

Starting subtest: fbc-rgb101010-draw-mmap-gtt
(kms_frontbuffer_tracking:1166) igt_debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file ../lib/igt_debugfs.c:419:
(kms_frontbuffer_tracking:1166) igt_debugfs-CRITICAL: Failed assertion: !mismatch
Subtest fbc-rgb101010-draw-mmap-gtt failed.
Comment 1 CI Bug Log 2019-04-10 12:15:30 UTC
The CI Bug Log issue associated to this bug has been updated.

### New filters associated

* SKL KBL WHL: igt@kms_frontbuffer_tracking@fbc(psr)?-rgb101010-draw-* - fail - Failed assertion: !mismatch (No new failures associated)
Comment 2 Mika Kahola 2019-08-22 10:12:11 UTC
kms_frontbuffer_tracking tests tracking mechanisms and its related features such as framebuffer compression (FBC), panel self refresh (PRS) and display refresh rate switching (DRRS).

Worst case scenario for a user is black or frozen screen. One may experience flickering too. 

Comment 3 Swati Sharma 2019-08-22 12:27:26 UTC
Based on bug history issue is seen only 5% times on KBL platform whereas seen 95% times on shard-skl. On KBL, reproduction rate is quite low - issue occurred 5 times almost 3 months back whereas on shard-skl issue is seen recently (almost a week back). May be we can drop, KBL from the affected platforms.

IGT has 100% failure rate. IGT is getting failed because of CRC mismatch issue. Issue is happening for the following subtests:


The real subtest to be executed depends on whether the pixel format(rgb101010) is supported by the features being tested or not. Need to check which subtest is actually failing (draw_subtest(t) or badformat_subtest(t)).

In last 15 runs https://intel-gfx-ci.01.org/tree/drm-tip/shards-all.html?testfilter=@fbcpsr-rgb101010-, issue is not seen.

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