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

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Date:	Fri, 6 Nov 2015 11:25:09 +0900
From:	Michel Dänzer <michel@...nzer.net>
To:	Pavel Machek <pavel@....cz>, Alex Deucher <alexdeucher@...il.com>
Cc:	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>,
	"Deucher, Alexander" <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>
Subject: Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080

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@...f:~$ 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
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