During igt/kms_flip on an SNB-2520m machine, monitor ELD G246HYL: [ 384.622585] [drm:intel_hdmi_detect [i915]] [CONNECTOR:46:HDMI-A-1] [ 384.650610] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1) [ 384.650659] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry [ 384.650956] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1) [ 384.650968] [drm:drm_dp_dual_mode_detect] DP dual mode HDMI ID: (err -6) [ 384.650979] [drm:drm_detect_monitor_audio] Monitor has basic audio support [ 384.651016] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 162 https://intel-gfx-ci.01.org/CI/Patchwork_2916/fi-snb-2520m/dmesg-during.log
This sporadic bug has been triggered on fi-snb-2520n by various tests on CI_DRM testing: 2016-10-28 CI_DRM_1778/fi-snb-2520m/igt@kms_force_connector_basic@force-edid: [ 418.279645] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 147 2016-10-31 CI_DRM_1782/fi-snb-2520m/igt@kms_force_connector_basic@force-edid [ 413.919373] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 158 2016-11-02 CI_DRM_1792/fi-snb-2520m/igt@kms_force_connector_basic@force-connector-state [ 402.714977] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 224 2016-11-03 CI_DRM_1798/fi-snb-2520m/igt@kms_force_connector_basic@force-load-detect: [ 417.697562] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 161 2016-11-07 CI_DRM_1806/fi-snb-2520m/igt@kms_pipe_crc_basic@bad-source [ 432.017861] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 117 See also already resolved bug 98228.
Seeing this issue with kms_force_connector_basic@force-edid on SNB. https://intel-gfx-ci.01.org/CI/Trybot_279/fi-snb-2520m/igt@kms_force_connector_basic@force-edid.html [ 405.905695] Setting dangerous option load_detect_test - tainting kernel [ 405.906442] Setting dangerous option load_detect_test - tainting kernel [ 406.074360] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 33
Do we have a full list of all testcases affected by this? If this only happens with kms_force_connector then it would very likely be a pure software bug (but don't ask me where ...).
EDID issues not seen lately on CI due to patch https://patchwork.freedesktop.org/series/16556/ merged.
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