radeon vs radeonhd drivers

[Simon Thum]

Alex Deucher wrote:
> On Thu, Nov 13, 2008 at 7:54 AM, Simon Thum <simon.thum at gmx.de> wrote:
>> Gene Heskett wrote:
>>> But its not that simple either, cuz when running the radeon driver, I get
>>> random screen blanking for 1-10 seconds at a time, and for a change it
>>> doesn't seem to be tied to the time of day since its doing it right now and
>>> it is 10 pm.
>> I'm experiencing the exact same thing, but it doesn't happen on every
>> Xorg session (about every third).
>>
>> It has been OK with the 6.8.0 version of the radeon driver, if it helps.
> 
> Please try the coherent_mode output attribute and see if that helps.
> If not we may need to tweak the plls for your monitor.
So, again I got the issue. coherent_mode was 0.
I swithed to 1, but it crept up again after 3 min or so. Then, I
switched back to zero. Since then, it ran fine (a few hours now).

Doesn't sound like this could help someone track it down, but anyway...