Re: odd radeondrmkms messages: edid checksum failure

[Michael <macallan%netbsd.org@localhost>]

Hello,

On Mon, 07 Dec 2015 15:02:34 +1100
matthew green <mrg%eterna.com.au@localhost> wrote:

> 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.

have fun
Michael