[Bug 432521] [NEW] kdm does not restart X server (that crashed on logout)

[Achim Bohnet]

Public bug reported:

Binary package hint: kdm

Problem:
Intel gfx driver crashes on logout (see LP #432509) from KDE session. 
User does not get a login screen again.  Instead the screen is a black screen
and Alt-F1,2,3, etc show now effect, screen still completely black.
ps output shows that no X server is running.
Bug is that kdm does not start a new X server

Hack/Workaround:
remote login and running:

  service kdm reload

gives a shiny now login screen.

Configuration detail see apport attachment in
https://bugs.launchpad.net/ubuntu/+bug/432509

Tail of End of session and Head of Start of session kdm.log snippet:

...
Backtrace:
0: /usr/bin/X(xorg_backtrace+0x26) [0x4f0086]
1: /usr/bin/X(xf86SigHandler+0x41) [0x485091]
2: /lib/libc.so.6 [0x7f4611750530]
3: /usr/lib/libdrm_intel.so.1(drm_intel_bo_alloc+0) [0x7f460fd288e0]
4: /usr/lib/xorg/modules/drivers//intel_drv.so(i830_allocate_memory+0x24a) [0x7f460ff6495a]
5: /usr/lib/xorg/modules/drivers//intel_drv.so(i830_allocate_2d_memory+0xb4) [0x7f460ff65274]
6: /usr/lib/xorg/modules/drivers//intel_drv.so [0x7f460ff5afa7]
7: /usr/lib/xorg/modules/drivers//intel_drv.so [0x7f460ff5f420]
8: /usr/bin/X(AddScreen+0x1d4) [0x4336e4]
9: /usr/bin/X(InitOutput+0x76f) [0x46efdf]
10: /usr/bin/X(main+0x1fe) [0x433dee]
11: /lib/libc.so.6(__libc_start_main+0xfd) [0x7f461173babd]
12: /usr/bin/X [0x433429]
Saw signal 11.  Server aborting.

X.Org X Server 1.6.3
Release Date: 2009-7-31
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-23-server x86_64 Ubuntu
Current Operating System: Linux alleehol 2.6.31-10-generic #34-Ubuntu SMP Wed Sep 16 01:09:15 UTC 2009 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.31-10-generic root=UUID=c81e0cef-ccb2-4fb0-9d11-02e85ba75a4c ro quiet splash
Build Date: 09 September 2009  12:45:08AM
xorg-server 2:1.6.3-1ubuntu6 (buildd at crested.buildd)
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
...


Achim

** Affects: kdebase-workspace (Ubuntu)
     Importance: Undecided
         Status: New

-- 
kdm does not restart X server (that crashed on logout)
https://bugs.launchpad.net/bugs/432521
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