Bug#667799: Radeon KMS fails on Radeon X850XT (R480) graphics card

[Jonathan Nieder <jrnieder@gmail.com>]

Hi Mike,

Mike Brodbelt wrote:

> Upgrading to any 3.2 kernel has caused video output to fail. On a 3.0.0 kernel
> (linux-image-3.0.0-2-amd64) the system performs as expected, however the 3.2
> kernel packages do not work.
[...]
>                                                          One a 3.0 kernel the
> font visibly changes at this point and boot continues, but on 3.2, all video
> output ceases. The machine completes its boot cycle and is reachable over SSH,
> but console/X display is unreachable, and there is no video output.

Thanks for reporting it.  Am I correct in assuming v3.3 from
experimental behaves the same way?

If so, please report this upstream to <http://bugs.freedesktop.org/>,
product DRI, component DRM/Radeon, and let us know the bug number so
we can track it.

Be sure to include:

 - steps to reproduce, expected result, actual result, and how the
   difference indicates a bug (should be simple in this case)

 - which kernel versions you have tested and result with each

 - full "dmesg" output from booting and reproducing the bug, as an
   attachment

 - perhaps "dmesg" output with the kernel parameter drm.debug=0x6 as
   well

Hopefully someone upstream may have commands to try (e.g. using
radeontool) or patches to narrow down the cause.

Hope that helps,
Jonathan