| Priority | medium |
|---|---|
| Bug ID | 80683 |
| Assignee | dri-devel@lists.freedesktop.org |
| Summary | EDID valid check ignores errors in CEA blocks |
| Severity | normal |
| Classification | Unclassified |
| OS | All |
| Reporter | stefan.bruens@rwth-aachen.de |
| Hardware | Other |
| Status | NEW |
| Version | DRI CVS |
| Component | DRM/other |
| Product | DRI |
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.
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