I tried 3.16.0 just using radeon.dpm=0 (without softlockup_panic=1) and I got a different stack trace. Shorter. It repeats itself every about 30 seconds more or less. Keyboard lights don't flash. The same message keeps coming out.
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4298034/+files/20150114_003043.png
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4298034/+files/20150114_003043.png
2015-01-13 23:19 GMT-03:00 Michel Dänzer <michel@xxxxxxxxxxx>:
On 14.01.2015 03:20, Federico wrote:
> I tried setting vga=791, but the panic messages done appear on screen,
> only the normal kernel boot log until the key lights start flashing.
Sounds like the panic happens after vesafb is already shut down in
favour of radeon.
> Also tried a video capture, but the text goes too fast even for the LCD
> to update the image.
>
> Do you know how to set the console font size as a kernel parameter?
Search for '8-.*font' in Documentation/svga.txt.
Other possibilities would be serial console or possibly netconsole.
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