igt@kms_color@pipe-[abc]-*gamma* - Failed assertion: !mismatch

Submitted by Marta Löfstedt @marta

Assigned to Uma Shankar @uma_mnnit

Link to original bug (#104782)

Description

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4176/shard-apl8/igt@kms_color@pipe-a-degamma.html

(kms_color:2797) igt-debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file igt_debugfs.c:356:
(kms_color:2797) igt-debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-A-degamma failed.

Blocking

• Bug 105978

added CI feature: display/Other platform: ICL platform: TGL priority::low severity::normal + 1 deleted label

Marta Löfstedt @marta said:

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4293/shard-apl8/igt@kms_color@pipe-a-legacy-gamma.html

(kms_color:2005) igt-debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file igt_debugfs.c:370:
(kms_color:2005) igt-debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-A-legacy-gamma failed.

Marta Löfstedt @marta said:

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4338/shard-apl2/igt@kms_color@pipe-b-gamma.html

(kms_color:1717) igt-debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file igt_debugfs.c:370:
(kms_color:1717) igt-debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-B-gamma failed.

Marta Löfstedt @marta said:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_6/fi-cfl-8700k/igt@kms_color@pipe-a-legacy-gamma.html

(kms_color:1541) igt_debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file ../lib/igt_debugfs.c:370:
(kms_color:1541) igt_debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-A-legacy-gamma failed.

Francesco Balestrieri @baleboy said:

Last seen: None according to cibuglogger. Can we close it?

LAKSHMINARAYANA VUDUM @l4kshmi said:

This issue was not seen last 6 months. This issue occurred only once few hundred's of runs ago. Closing this bug.

Martin Peres @mupuf said:

Guess who's back?

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4666/shard-apl4/igt@kms_color@pipe-b-degamma.html

Martin Peres @mupuf said:

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4671/shard-kbl2/igt@kms_color@pipe-c-legacy-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4945/shard-kbl3/igt@kms_color@pipe-c-legacy-gamma.html

Starting subtest: pipe-C-legacy-gamma
(kms_color:2304) igt_debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file ../lib/igt_debugfs.c:392:
(kms_color:2304) igt_debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-C-legacy-gamma failed.

Martin Peres @mupuf said:

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4945/shard-skl2/igt@kms_color@pipe-c-legacy-gamma.html

Starting subtest: pipe-C-legacy-gamma
(kms_color:2227) igt_debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file ../lib/igt_debugfs.c:392:
(kms_color:2227) igt_debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-C-legacy-gamma failed.

Martin Peres @mupuf said:

Also seen on WHL, CFL and BXT!

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_121/fi-whl-u/igt@kms_color@pipe-c-legacy-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_121/fi-cfl-s3/igt@kms_color@pipe-c-legacy-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_121/fi-cfl-guc/igt@kms_color@pipe-c-legacy-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_121/fi-cfl-8700k/igt@kms_color@pipe-c-legacy-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_121/fi-cfl-8109u/igt@kms_color@pipe-c-legacy-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_121/fi-bxt-j4205/igt@kms_color@pipe-c-legacy-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_121/fi-bxt-dsi/igt@kms_color@pipe-c-legacy-gamma.html

Starting subtest: pipe-C-legacy-gamma
(kms_color:2339) igt_debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file ../lib/igt_debugfs.c:392:
(kms_color:2339) igt_debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-C-legacy-gamma failed.

Martin Peres @mupuf said:

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4677/shard-skl3/igt@kms_color@pipe-b-gamma.html

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4981/shard-skl3/igt@kms_color@pipe-b-gamma.html

Starting subtest: pipe-B-gamma
(kms_color:2123) igt_debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file ../lib/igt_debugfs.c:392:
(kms_color:2123) igt_debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-B-gamma failed.

CI Bug Log said:

A CI Bug Log filter associated to this bug has been updated:

{- SKL BXT APL KBL CFL WHL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch -}
{+ SKL BXT APL KBL CFL WHL ICL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch +}

New failures caught by the filter:

• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5598/shard-iclb1/igt@kms_color@pipe-a-degamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5598/shard-iclb1/igt@kms_color@pipe-a-gamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5598/shard-iclb7/igt@kms_color@pipe-c-legacy-gamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5598/shard-iclb7/igt@kms_color@pipe-a-legacy-gamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4824/shard-iclb3/igt@kms_color@pipe-b-legacy-gamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4824/shard-iclb6/igt@kms_color@pipe-a-legacy-gamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4824/shard-iclb7/igt@kms_color@pipe-a-degamma.html

CI Bug Log said:

A CI Bug Log filter associated to this bug has been updated:

{- SKL BXT APL KBL CFL WHL ICL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch -}
{+ SKL BXT APL KBL GLK CFL WHL ICL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch +}

New failures caught by the filter:

• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5598/shard-glk1/igt@kms_color@pipe-c-legacy-gamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5598/shard-glk2/igt@kms_color@pipe-b-degamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5598/shard-glk3/igt@kms_color@pipe-c-degamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4824/shard-glk4/igt@kms_color@pipe-b-degamma.html
  
• https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4824/shard-glk8/igt@kms_color@pipe-c-degamma.html

Jani Saarinen @jani.saarinen said:

Assigned to Uma

CI Bug Log said:

A CI Bug Log filter associated to this bug has been updated:

{- SKL BXT APL KBL GLK CFL WHL ICL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch -}
{+ BSW BXT APL SKL KBL GLK CFL WHL ICL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch +}

New failures caught by the filter:

• https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_225/fi-bsw-n3050/igt@kms_color@pipe-c-degamma.html

Uma Shankar @uma_mnnit said:

This issue is happening due to pipe rounding (an expected behaviour in such scenario, confirmed with hw architect Runyan, Art as well) causing crc to mismatch. Unfortunately the test relies on the crc.
But checked on simulation and dump the pipe bmp output and compared bit by bit with the expected output. The data was matching perfectly. There will no visible impact to user as the framebuffer content is perfect, so user will not be able to see any issues.

Future actions planned is :

• Use pipe writeback to get the framebuffer and check the pixel values directly (need to implement it first)
  
• Use chamelium as a workaround for the lack of pipe writeback
  

All this will need significant implementation on driver side and even the tests need to re-written to align this. We will work on it separately.

CI Bug Log said:

A CI Bug Log filter associated to this bug has been updated:

{- BSW BXT APL SKL KBL GLK CFL WHL ICL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch -}
{+ BYT BSW BXT APL SKL KBL GLK CFL WHL ICL: igt@kms_color@pipe-[abc]-gamma - Failed assertion: !mismatch +}

New failures caught by the filter:

• https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_249/fi-byt-clapper/igt@kms_color@pipe-a-legacy-gamma.html

Jani Saarinen @jani.saarinen said:

Based on assessment lowering priority.

Ville Syrjälä @vsyrjala said:

ICL fixed by

commit 09b25812db10fcbd7937c1b7ca279c5c0d77ba9d
Author: Ville Syrjälä ville.syrjala@linux.intel.com
Date: Fri Apr 12 21:30:09 2019 +0300

drm/i915: Enable pipe HDR mode on ICL if only HDR planes are used

I did forger to add the bugzilla link to the commit :/

LAKSHMINARAYANA VUDUM @l4kshmi said:

(In reply to Ville Syrjala from comment 18)

ICL fixed by

commit 09b25812db10fcbd7937c1b7ca279c5c0d77ba9d
Author: Ville Syrjälä ville.syrjala@linux.intel.com
Date: Fri Apr 12 21:30:09 2019 +0300

drm/i915: Enable pipe HDR mode on ICL if only HDR planes are used

I did forger to add the bugzilla link to the commit :/

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_5080/shard-iclb8/igt@kms_color@pipe-a-degamma.html

Starting subtest: pipe-A-degamma
(kms_color:5428) igt_debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file ../lib/igt_debugfs.c:419:
(kms_color:5428) igt_debugfs-CRITICAL: Failed assertion: !mismatch
Subtest pipe-A-degamma failed.

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_5081/shard-iclb7/igt@kms_color@pipe-c-degamma.html

Still occurring on ICL, does these failures need a separate bug?