[Pkg-xfce-devel] Bug#466687: Bug#466687: Bug#466687: xfce4: windows are not being redrawn correctly when moving - nv/nvidia driver Xinerama, dualhead

[Jan Capek]

Hi,

Yves-Alexis Perez wrote:
> On Wed, Feb 20, 2008 at 03:55:44PM +0000, Jan Capek wrote:
>>> Can you retry this with the nv or vesa driver? Is compositing enabled?
>> I will try w/ the above drivers if I get them to work. Nv doesn't seem 
>> to work with xinerama. Compositing is not enabled.
> 
> Make sure compositing is disabled in xorg.conf. (if the "Compositor" tab
> appears in the Window Manager tweaks you need to disable it manually).
> 
>>> Can you retry without xinerama too?
>> This is already with xinerama.
> 
> I asked you to try _without_.
Disabling xinerama 'solves' the problem however at that point I am stuck 
with 2 independent screens that are not of much use for me.

I am not sure, maybe I should file a bug somewhere in the 'nv', 'nvidia' 
driver area. However, this bug seems to trigger with xfce4 only.

I have made a research and tried the following configurations for dual 
head so far:
- nvidia driver (2 instances of the device) + Xinerama - this gives me 
satisfying performance, however the above bug occurs in xfce4

- nvidia driver + TwinView option (X.org's xinerama is disabled) - this 
works fine, however, the performance is VERY BAD. Moving windows around 
is fine. Switching desktop and redrawing of all windows on the freshly 
switched desktop is very very slow

- nv driver - doesn't support dual head on my nvidia card, xrandr 
extension doesn't show all connected screens. I will take a look at the 
problem further here.


If anybody can think of a testcase, to duplicate the issue in a 
different environment than xfce4, I would be more than happy to try that.

I am attaching the two configurations + xrandr output of the twinview 
one + relevant X.org logs.

Best regards,

Jan
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