[Panel-devel] Latest changes screwed Xinerama setups

Lukas Appelhans l.appelhans at gmx.de
Wed Oct 31 15:32:06 CET 2007


Am Mittwoch, 31. Oktober 2007 15:23:57 schrieb Aaron J. Seigo:
> On Wednesday 31 October 2007, Andreas Pakulat wrote:
> > On Mittwoch, 31. Oktober 2007, Aaron J. Seigo wrote:
> > > On Wednesday 31 October 2007, Andreas Pakulat wrote:
> > > > On Mittwoch, 31. Oktober 2007, Lukas Appelhans wrote:
> > > > > Mmh, I saw the blog-entry of apaku, but for me, the complete
> > > > > right screen is empty, I can move windows there, but no plasma.
> > > > >
> > > > > :-( The left screen is my main one and both have 1280x1024 ...
> > > >
> > > > I suggest to write a bugreport about that. I didn't really try
> > > > other arrangements of monitors, so maybe Aaron just fixed the case
> > > > of 2nd screen leftof 1st screen :)
> > >
> > > heh.. well, now it's all generic and no assumptions are made of
> > > ordering.
> > >
> > > looking at his debug output, only one screen (0) is getting a
> > > containment:
> > >
> > > plasma(14529) PlasmaApp::createPanels: Containment name: "Desktop" |
> > > screen: 0 | geometry: QRectF(0,0 1280x1024) | zValue: 100
> > >
> > > the size looks right, it just seems that screen 1 isn't getting a
> > > containment at all.
> >
> > Hmm, I'm not 100% sure how TwinView works, but I think its similar to
> > the MergedFB mode from ATI and also radeon. And those don't provide
> > Xinerama capabilities. Instead they let X11 apps think they handle just
> > 1 large desktop and the driver makes sure the 2 screens "look" into the
> > right parts of that large desktop. So maybe its not the number of
> > containments, but simply the size of the one you do create...
>
> .. in which case we'd get one big containment. but looking at his
> appletsrc, we're not. =/
>
> twinview actually provides a xinerama compatible interface which provides
> the proper responses to "how many screens" and "what is their geometry".
> you can turn this off, but then you should expect all sorts of brokenness
> as apps are generally written to xinerama, not proprietary approaches like
> twinview / mergedfb.
>
> i can imagine that there is some brokenness somewhere along the way (who
> knows, maybe QDesktopWidget is broken here even... doubtful, but possible;
> i haven't looked that deep into the code)

If it wasn't changed in the last two weeks, it isn't broken^^
It worked correctly at all time, but for perhaps 1 week it is broken 
now... :-(
So don't know, I hope you can find a solution

Thx

Lukas


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