I'm seeing a similar issue -- the user on the second simultaneously started X server does not get Compiz effects. In fact they don't get any 3D acceleration at all, and there may also be problems with movie playback.
Comparing ~/.xsession-errors for the two users, the point of divergence is just after the following lines: Checking for Composite extension: present. Checking screen 1Comparing resolution (1680x1050) to maximum 3D texture size (2048): Passed. In the success case (1st user), we have the following lines: Checking for Software Rasterizer: Not present. Checking for nVidia: not present. Checking for FBConfig: present. running under gnome seesion, checking for gnomecompat Checking for Xgl: not present. /usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format I/O warning : failed to load external entity "/home/user1/.compiz/session/10ea06d6867fce9488124827842310992400000054350019" ** (nm-applet:5683): DEBUG: applet_common_device_state_changed /usr/bin/compiz.real (cube) - Warn: Failed to load slide: /usr/share/gdm/themes/Human/ubuntu.png In the failure case (2nd user), we have: Checking for Software Rasterizer: present. Software rasterizer detected, abortingaborting and using fallback: /usr/bin/metacity Window manager warning: Failed to read saved session file /home/user2/.config/metacity/sessions/108c4cc618867bb54c12482962177451700000089280019.ms: Failed to open file '/home/user2/.config/metacity/sessions/108c4cc618867bb54c12482962177451700000089280019.ms': No such file or directory Failed to play sound: Sound disabled So the presence of the "Software Rasterizer" (presumably in the X server) appears significant. Going further to compare /var/log/Xorg.0.old (success) and /var/log/Xorg.20.log (failure), the latter has the following lines (there are other diffs preceding this that may be significant, see attachment): (II) [drm] DRM interface version 1.0 (EE) [drm] Could not set DRM device bus ID. (EE) intel(0): [dri] DRIScreenInit failed. Disabling DRI. So, at least in my case, the problem appears to be that the second X server is unable to initialise DRI (Direct Rendering Infrastructure -- acceleration), so the problem lies with the X server rather than within Compiz. I guess this may be driver/hardware-specific? I have on-board Intel G35 graphics. Question: does this case (Compiz on two simultaneous X servers) work for anyone, with any graphics hardware? ** Attachment added: "Diff between successful and failing /var/log/Xorg.NN.log" http://launchpadlibrarian.net/30391194/Xorg-log.diff -- Multiple users cannot run desktop effects simultaneously https://bugs.launchpad.net/bugs/383753 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
