in linux/drivers/gpu/drm/drm_edid.c: bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid) { ... if (csum) { if (print_bad_edid) { DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); } /* allow CEA to slide through, switches mangle this */ if (raw_edid[0] != 0x02) goto bad; } ... return true; --- i.e. CEA blocks are always reported as valid. This occurs frequently for me with a Radeon 7750 and a Dell U2713HM connected via DisplayPort, the I2C-over-AUX seems to be buggy and swallows single bytes. If I change the "return true;" to "return !csum;" bad transfers are retried.
Hi, Freedesktop's Bugzilla instance is EOLed and open bugs are about to be migrated to http://gitlab.freedesktop.org. To avoid migrating out of date bugs, I am now closing all the bugs that did not see any activity in the past year. If the issue is still happening, please create a new bug in the relevant project at https://gitlab.freedesktop.org/drm (use misc by default). Sorry about the noise!
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