Public bug reported:
After I switch between sessions (switch to new user session via
Kstart->leave->switch_user, but also when switching to text console via
Ctrl+Alt+F1), and after I try to go back to the original session, the
screen is completely garbled, i.e. the screen is filled with blinking
black&white triangles of all shapes and sizes, sometimes there is a
functional mouse cursor.
Here are the things I tried in order to narrow down the issue:
- In system settings (Display and Monitor ---> Compositor ---> Rendering
Backend) I switched from OpenGL 3.1 to OpenGL 2.0
- I changed display drivers from nvidia-346 to nvidia-346-updates
- I disabled screen lock
- I disabled virtual desktops
Neither of the above actions improved matters.
Here are the things which I also noticed:
- Restarting sddm (sudo service sddm stop) restores a functioning login screen
- Typing Ctrl+Alt+F1 on the login screen, and then Alt+F7 to go back gives me a
working login screen
- Killing kwin_x11 kills the window decorations, but restores a working screen
image.
- I frequently saw kwin running at 100% system load, which I vaguely remember
to be an old issue with kwin, it may be unrelated to my current woes
- nothing of value shows up in dmesg
The above points tell me, that this is not a graphics driver issue, but
one in kwin, but obviously I may be wrong. If so, please let me know. I
am more than willing to test debug versions of kwin, self compiled if
necessary, or whatever it takes to track down the root issue.
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: kwin 4:5.2.2a-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Sep 25 14:23:18 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-09-25 (1094 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120423)
SourcePackage: kwin
UpgradeStatus: Upgraded to vivid on 2015-09-16 (9 days ago)
** Affects: kwin (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug vivid
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https://bugs.launchpad.net/bugs/1499717
Title:
Session switching broken
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