Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080

From
Pavel Machek <hidden>
Date
2015-11-05 20:26:25
Also in
dri-devel, lkml
Reply to
Christian König, 2015-11-05
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RADEON_PLL_PREFER_MINM_OVER_MAXP).
The flickering would vanish completely if that's the reason for the issue
you are seeing.
Try setting ref_div_min and ref_div_max to 2 in
 radeon_compute_pll_avivo().
Ok, I did this, but no luck, still flickers. But the flicker only
happens when something changes on screen, like dragging a big
window. Is that consistent with wrong PLL timings?
Does it go away with radeon.dpm=0?  Sounds more like either memory
reclocking happening outside of vblank, or underflow to the display
controllers.
Sounds like my suspicion was right, that doesn't seem to be a PLL issue
after all.

Just to rule out the obvious your system works fine with windows and you
don't have a extra long cable for the monitor or something like
this?
Cable is something like 2 meters. It does not seem to be EMI, because
it only happens when the display is being updated.

The system had some thermal issues before, but a) there's big fan
cooling it now and b) it does not get worse with more usage. I don't
think its heat.

I don't have Windows for a test, sorry.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Thread (17 messages) 17 messages, 5 authors, last reply 2015-11-06
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