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

["Michel Dänzer" <michel@daenzer.net>]

On 06.11.2015 05:23, Pavel Machek wrote:
> Hi!
> 
>>>> 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.
> 
> No, it does not:
> 
> pavel@half:~$ cat /proc/cmdline
> BOOT_IMAGE=(hd0,2)/l/linux/arch/x86/boot/bzImage root=/dev/sda4
> resume=/dev/sda1 radeon.dpm=0
> 
> ..and same issue. And yes, it looks like an underflow to me. How can I
> debug reclocking / underflows?

Does radeon.disp_priority=2 help?


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer