Bug 741802

Summary: Windows do not show up on second desktop with KDE & nouveau
Product: [Fedora] Fedora Reporter: Chad Feller <cfeller>
Component: xorg-x11-drv-nouveauAssignee: Ben Skeggs <bskeggs>
Status: CLOSED WORKSFORME QA Contact: Fedora Extras Quality Assurance <extras-qa>
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Version: 15CC: airlied, ajax, bskeggs
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Last Closed: 2011-09-28 05:04:16 UTC Type: ---
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Description Flags
Screenshot windows not appearing on second desktop. none

Description Chad Feller 2011-09-27 23:06:14 UTC 
Created attachment 525226 [details]
Screenshot windows not appearing on second desktop.

Description of problem:
When enabling desktop effects with KDE, applications are not displayed on the second monitor.  I can move my mouse over to the second monitor, and see the mouse on the second monitor, but any window I drag over there is effectively not displayed.  However when dragging my mouse over the invisible window on the second monitor, KDE/X11 knows it is there as my mouse changes shape accordingly (e.g., to resize the the window if need be, etc).

This is only an issue if I enable desktop effects with nouveau.  If I leave desktop effects disabled, this isn't an issue.  Additionally, if I switch to the proprietary nvidia driver and enable desktop effects, this also isn't an issue.  So this issue appears to be exclusively between nouveau <--> KDE (w/ desktop effects enabled.

I only enabled the "default" desktop effects.  That is, I only checked the "Enable desktop effects" checkbox, from System Settings.

Version-Release number of selected component (if applicable):

xorg-x11-drv-nouveau-0.0.16-24.20110324git8378443.fc15.x86_64
kdebase-4.6.5-2.fc15.x86_64

How reproducible:
always.  I tried disabling, and re-enabling, rebooting.  It consistently happened.

Steps to Reproduce:
nouveau + KDE + "Desktop Effects" enabled
  
Actual results:
windows are not displayed on second monitor

Expected results:
windows are displayed on second monitor

Additional info:
Hardware:
http://www.smolts.org/client/show/pub_05b04b78-940b-486a-aab9-28394729f2cb

I attached screenshot demonstrating the issue.
Comment 1 Chad Feller 2011-09-27 23:22:51 UTC 
OK, I guess scratch the "always" part under "how reproducible".  

I just switched back the nouveau driver, forgetting that I left desktop effects enabled before rebooting (after I removed the nvidia driver and nuked the xorg.conf), and now everything is working beautifully.

If/when this bug should rear its head again, what debug info do you need?
Comment 2 Ben Skeggs 2011-09-28 05:04:16 UTC 
Very odd.  Hopefully this won't come back :)  I'll close this for now.  If this reoccurs, could you please attach your /var/log/Xorg.0.log, and the output of running the "dmesg" command to this bug.

Thanks again!