Bug#682099: xserver-xorg-video-ati: EXAPixmaps=On screen tearing at high resolution under certain configurations

Alex Deucher alexdeucher at gmail.com
Fri Jul 20 11:33:12 PDT 2012

On Fri, Jul 20, 2012 at 1:45 PM, Michel Dänzer <daenzer at debian.org> wrote:
> On Don, 2012-07-19 at 23:43 +1000, James Robertson wrote:
>> Package: xserver-xorg-video-ati
>> Version: 1:6.14.4-5
>> Severity: normal
>> Dear Maintainer,
>> I have a Lenovo R500 laptop with an "[AMD] nee ATI RV620 [Mobility Radeon HD 3400
>> Series]" graphics chip
>> I recently obtained 2x AOC monitors with a 1920x1080 resolution and have
>> these connected via DVI and VGA to a laptop docking station.
>> The laptop only supports a maximum of 2 displays at once.
>> With the laptop display disabled I get screen tearing and corruption when
>> using 1 or both of the external monitors with 1920x1080 resolution.
>> But strangely if I set one of them to a lower resolution such as 1680x1050
>> (the other still at 1920x1080) the screen tearing issue dissapears.  Odd given
>> a single display gets the tearing...
>> If using the laptop's display in conjunction with either DVI or VGA
>> connected monitor at 1920x1080 I experience no tearing.

Also note that rendering can only be synchronized to one head at a
time to avoid tearing.  If you have windows that span multiple heads,
you may get tearing on the non-synced heads.


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