re: odd radeondrmkms messages: edid checksum failure

[matthew green <mrg%eterna.com.au@localhost>]

> > i see this very occasionally on a radeon 4500 kernel messages:
> > 
> > DRM error in drm_edid_block_valid: EDID checksum is invalid, remainder is 208
> > drm kern error: Raw EDID:
> > 00 ff ff ff ff ff ff 00 3d cb 33 0b 00 00 00 00
> > 00 15 01 03 80 10 09 78 0a ae a5 a6 54 4c 99 26
> > 14 50 54 20 00 00 01 01 01 01 01 01 01 01 01 01
> > 01 01 01 01 01 01 01 1d 80 18 71 1c 16 20 58 2c
> > 25 00 c4 8e 21 00 00 9e 01 1d 80 d0 72 1c 16 20
> > 10 2c 25 80 c4 8e 21 00 00 9e 00 00 00 fc 00 48
> > 54 2d 52 33 39 30 0a 20 20 20 20 20 00 00 00 fd
> > 00 17 f0 0f 7e 11 00 0a 20 20 20 20 20 20 01 fb
> > 
> > it doesn't seem to affect anything, but it's odd, so i'm reporting it here.
> 
> Sounds like an i2c error - guess we need to retry reading the EDID
> block from the monitor if the checksum is wrong. This is odd, I've seen
> monitors not responding the first time around, but no actual bit errors
> in the data.

i guess i failed to mention this happens at run time.  perhaps after
unblanking the display?  it doesn't happen at boot time (that i've
seen) and it doesn't seem to affect run-time usage...

thanks.


.mrg.