Bug#878170: xserver-xorg-video-radeon: Fails to match video to vsync

Anton Ivanov anton.ivanov at kot-begemot.co.uk
Wed Oct 11 08:58:38 UTC 2017

It tears in full screen with and without compositing in xfce

On 11 October 2017 09:40:59 BST, "Michel Dänzer" <michel at daenzer.net> wrote:
>On 10/10/17 07:50 PM, Anton Ivanov wrote:
>> Package: xserver-xorg-video-radeon
>> Version: 1:7.8.0-1+b1
>> Severity: important
>> Dear Maintainer,
>> Radeon (and amdgpu for that matter) in stretch no longer match frames
>> to vsync correctly. This is observable with vdpau, opengl and plain
>> xvideo. 
>> This used to work correctly in jessie so this is a recent regression.
>> This is also observable in both full screen and windowed mode. The
>> bottom ~5-10% of the picture updates on the wrong vsycn which is
>> clearly visible especially in action sequences and animation.
>> Tested with vlc, mplayer, xine and other software in a variety of
>> output modes. I think I have eliminated other possible common factors
>> leaving the video driver (and/or firmware) the most likely culprit.
>The only possibilities for reliably avoiding tearing in Xorg have
>1. Using a compositing manager which uses OpenGL for rendering
>2. Running an application in fullscreen, using page flipping (i.e. the
>  application must use something like OpenGL / VDPAU / VA-API / ... for
>   rendering / presentation, but not something like XVideo or even pure
>   X11)
>3. Enabling TearFree
>Note that 1.+2. are not sufficient when using rotation or other
>transforms via the RandR extension.
>Does your setup fall under any of these cases? If not, you may just
>gotten lucky before.
>Earthling Michel Dänzer               |              
>Libre software enthusiast             |             Mesa and X

Sent from my Android device with K-9 Mail. Please excuse my brevity.
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