[compiz] compiz works really strange with external monitor

[Artur]

Maybe the following description would help a bit to find a reason ?
I have similar example. It wasn't always like this, it started in the past after one of upgrades of compiz (months ago, I think shortly after beryl-compiz merge). It may be also due to upgrade of Xorg (from 1.2 to 1.3).

The virtual size of my screen is 1280x1024, display resolution is 1024x768. When screensaver is started it usually displays only on part of the screen (of size 1024x768 or a bit smaller), like on the following "sketch":

+----------------.----+
|screen 1280x1024.    |
|     +----------.----+
|     |          .    |
|     | screen saver  |   ..... dots mark out boundaries of visible area
|.....|...........    |
|     |  <= 1024x768  |
+-----+---------------+

However sometimes (rarely) screensaver starts on the whole 1280x1024 area. I could not find any rule.

The result of the mentioned xinerama test is always the same:
Head 0: num 0, Origin 0 0, Size 1280 1024

It happens with different kinds of hardware and in different Linux distributions.

Regards.
Artur

W dniu 2008-02-05 07:01, Danny Baumann pisze:
-- 
> Hi,
> 
>>> Hi, u found this bug with compiz turned on:
>>>
>>> "metacity doesn't know what is the full screen resolution"
>>> https://bugzilla.redhat.com/show_bug.cgi?id=431302
>>>
>>> Can you please look at it and say if this looks like a compiz, X,
>>> gnome which bug :)
>>>
>>> Thank you very much in advance,
>>> Valent.
>> On Fedora bugzilla[1] Matej suggested[2] that this is compiz bug, 
> 
> Oh, how I love this "I don't know why and give no reason, but I blame
> compiz". :-/
> 
>> but
>> I attached[3] a new image that shows same bug on KDE 4.0. AFAIK KDE
>> 4.0 uses its own compositing and not compiz so this looks maybe as
>> some underlaying bug? X.org maybe?
> 
> I'm inclined to say that this is broken Xinerama information provided by
> the driver.
> 
>> If you think it is a compiz bug just tell me and I will enter new bug
>> in compiz bugzilla.
> 
> You already have opened one in the Compiz Fusion bugzilla[1] - that's
> enough ;-)
> I've added a test tool to this bug; please provide its output.
> 
> Regards,
> 
> Danny
> 
> [1] http://bugs.opencompositing.org/show_bug.cgi?id=765
>