Blank screen after updating to Kernel 3.16 with Radeon HD4250 and DVI
markus at gaugusch.at
Mon Nov 10 07:07:19 PST 2014
On Nov 10, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Fri, Nov 7, 2014 at 3:32 PM, Markus Gaugusch <markus at gaugusch.at> wrote:
>> I hope you can help me ...
>> After upgrading my system to openSUSE 13.2 I experienced very bad behaviour
>> - my screen started to go blank during boot, returned again, turned black
>> again and kept black. Sometimes it returned for a short while and went black
>> I was able to get a stable picture by using VGA instead of DVI connection or
>> by using the old kernel from openSUSE 13.1 (linux 3.11.6). So it is
>> definitely a kernel-only problem.
>> I can also get a stable DVI connection with the new kernel if I connect BOTH
>> cables (VGA+DVI)! I have set my screen to "mirroring", so I have the same
>> picture via VGA and DVI now. If I disconnect VGA, it still works, but only
>> until the moment that I run "xrandr". As soon as I reconnect VGA, DVI is
>> stable again.
> Sounds like a pll problem. If you can bisect, that would be great,
> but in the interim, I'd suggest trying the patches on this bug:
Looks promising, I'll try when I'm at the machine again.
> Do you have problems with any any other modes? E.g.,
> xrandr --output DVI-0 --mode 1680x1050
By pure luck I tried this yesterday and 1680x1050 works fine on DVI ...
the funny thing is that if I switch to a VT console and then back, I get a
picture for a very short time, then black again. The monitor also reacts
strange - I can no longer switch it to VGA, it is just blank and black
(but with signal, though no OSD).
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