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Message-ID: <563C0F85.8070204@daenzer.net>
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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