As far as I can tell, there is nothing interesting in kdm.log or Xorg.1.log (both attached, for a newly generated crash).<div> </div><div>Regards, Thue <div class="gmail_quote">2011/3/4 Michel Dänzer <<a href="mailto:daenzer@debian.org">daenzer@debian.org</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">On Don, 2011-03-03 at 10:33 +0100, Thue Janus Kristensen wrote: > Package: xserver-xorg-video-radeon > Version: 1:6.14.0-1 > Severity: important > > I have a 100% reproducible crash, using these steps: > 1) From inside KDE go "kde menu"->"leave"->"switch user" > 2) "New session" > 3) log in to the new session, with another user, using gnome > 4) Go "gnome panel"->"administrator"->"log [user] out..."->"logout" > 5) The X server crashes, with the following in Xorg.0.log: > > [...] > [ 5654.762] (II) RADEON(0): Modeline "1600x1200"x0.0 162.00 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync (75.0 kHz) > [ 5728.944] (II) AIGLX: Suspending AIGLX clients for VT switch > [ 5734.796] (II) Open ACPI successful (/var/run/acpid.socket) > [ 5734.796] (II) AIGLX: Resuming AIGLX clients after VT switch > [ 5734.797] Unable to retrieve master > [ 5734.797] (EE) RADEON(0): failed to set mode: Permission denied(EE) RADEON(0): failed to set mode: Permission denied The question is why retrieving master fails. Most likely the second X server fails to drop master (in time), maybe it crashes or otherwise doesn't shut down cleanly? Anything interesting in the X or kdm/gdm log file for the second X server? > Backtrace: > [ 5734.797] 0: /usr/bin/X (xorg_backtrace+0x28) [0x45ceb8] > [ 5734.797] 1: /usr/bin/X (0x400000+0x64cd9) [0x464cd9] > [ 5734.797] 2: /lib/libpthread.so.0 (0x7f020cb93000+0xef60) [0x7f020cba1f60] > [ 5734.797] 3: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f020980c000+0xebff1) [0x7f02098f7ff1] > [ 5734.797] 4: /usr/bin/X (xf86ProbeOutputModes+0x146) [0x483316] > [ 5734.797] 5: /usr/bin/X (0x400000+0x8a044) [0x48a044] > [ 5734.797] 6: /usr/bin/X (RRGetInfo+0xd1) [0x4b7cc1] > [ 5734.797] 7: /usr/lib/xorg/modules/extensions/libglx.so (0x7f020a34b000+0x40c2c) [0x7f020a38bc2c] > [ 5734.797] 8: /usr/bin/X (xf86Wakeup+0x3f2) [0x474902] > [ 5734.797] 9: /usr/bin/X (WakeupHandler+0x4b) [0x43aa5b] > [ 5734.797] 10: /usr/bin/X (WaitForSomething+0x1d7) [0x465547] > [ 5734.797] 11: /usr/bin/X (0x400000+0x32b12) [0x432b12] > [ 5734.797] 12: /usr/bin/X (0x400000+0x2573b) [0x42573b] > [ 5734.797] 13: /lib/libc.so.6 (__libc_start_main+0xfd) [0x7f020b8f6c4d] > [ 5734.797] 14: /usr/bin/X (0x400000+0x252c9) [0x4252c9] > [ 5734.797] Segmentation fault at address 0x10 > [ 5734.798] > Fatal server error: > [ 5734.798] Caught signal 11 (Segmentation fault). Server aborting I presume this is basically things going south after the above. -- Earthling Michel Dänzer | <a href="http://www.vmware.com" target="_blank">http://www.vmware.com</a> Libre software enthusiast | Debian, X and DRI developer </blockquote></div> </div>