Bug#656015: [2.6.39 -> 3.0 regression] Monitor EDID not recognized by Linux kernel 3.x on AMD A6 CPU

[Jonathan Nieder <jrnieder@gmail.com>]

tags 656015 + moreinfo
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Jonathan Nieder wrote:
> Grigor Gatchev wrote:

>> After upgrading kernel from 2.6.39 to 3.0.0, monitor gets switched off
>> during kernel boot. Otherwise all is OK (I can ssh in, etc).
>>
>> The following lines are found in the syslog:
>>
>> [drm] Radeon display connector HDMI-A-1: No monitor connected or invalid EDID
>> [drm] Radeon display connector VGA-1: No monitor connected or invalid EDID
>>
>> The bug persists also in kernels 3.1.0, 3.1.0-1 and 3.2.0-rc7.
>> Kernels up to 2.6.39 incl. work fine.
[...]
> Please report this upstream at http://bugs.freedesktop.org/, product DRI,
> component DRM/Radeon, and let us know the bug number so we can track
> it.  Be sure to attach full "dmesg" output from booting an affected
> kernel, and Xorg.0.log if applicable.

Thanks again for a clear report.  Did you get a chance to report it
upstream?

Sincerely,
Jonathan