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

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Message-ID: <20151106124554.GA3630@amd>
Date:	Fri, 6 Nov 2015 13:45:54 +0100
From:	Pavel Machek <pavel@....cz>
To:	Michel Dänzer <michel@...nzer.net>
Cc:	Alex Deucher <alexdeucher@...il.com>,
	"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 Fri 2015-11-06 11:25:09, Michel Dänzer wrote:
> 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?

Tried this, and no change, still flickers.

pavel@...f:~$ cat /proc/cmdline
BOOT_IMAGE=(hd0,2)/l/linux/arch/x86/boot/bzImage root=/dev/sda4
resume=/dev/sda1 radeon.dpm=0 radeon.disp_priority=2
pavel@...f:~$

I searched for some more config options, and tried:

pavel@...f:~$ cat /proc/cmdline
BOOT_IMAGE=(hd0,2)/l/linux/arch/x86/boot/bzImage root=/dev/sda4
resume=/dev/sda1 radeon.dpm=0 radeon.disp_priority=2
radeon.amdgpu_runtime_pm=0 radeon.bapm=0 radeon.sched_hw_submission=0
radeon.enable_semaphores=0
pavel@...f:~$

..still flickers.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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