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[Launchpad Bug Tracker <590109@xxxxxxxxxxxxxxxxxx>]

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After some user switches using either the switch user appet or "switch
from..." or on the login screen, my computer hangs.

Note that this does not happen every time I switch users, only after
about every 3rd switch. The only resolution I found for the freeze is a
cold restart.

My hardware is a Lenovo W500 laptop, with 2 graphic adapters. I disabled the ATI adapter in the BIOS, ubuntu thus only sees the Intel adapter. lspci reports it as: 
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)

Here is the adapter info from Xorg.log:
(--) PCI:*(0:0:2:0) 8086:2a42:17aa:2114 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller rev 7, Mem @ 0xf4400000/4194304, 0xd0000000/268435456, I/O @ 0x00001800/8
(--) PCI: (0:0:2:1) 8086:2a43:17aa:2114 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller rev 7, Mem @ 0xf4200000/1048576


I found the follwing report in my Xorg.log, making me strongly believe
the graphics adapter is the problem here.

(II) intel(0): Modeline "1920x1200"x0.0  125.66  1920 1950 2030 2060  1200 1202 1206 1220 -hsync -vsync (61.0 kHz)
[mi] EQ overflowing. The server is probably stuck in an infinite loop.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e937b]
1: /usr/bin/X (mieqEnqueue+0x1ab) [0x80e8b6b]
2: /usr/bin/X (xf86PostKeyEventP+0x7c) [0x80c276c]
3: /usr/bin/X (xf86PostKeyboardEvent+0x4b) [0x80c283b]
4: /usr/lib/xorg/modules/input/evdev_drv.so (0xb6e79000+0x4bfd) [0xb6e7dbfd]
5: /usr/bin/X (0x8048000+0x6d5bf) [0x80b55bf]
6: /usr/bin/X (0x8048000+0x122794) [0x816a794]
7: (vdso) (__kernel_sigreturn+0x0) [0xb787e400]
8: /usr/lib/xorg/modules/libfb.so (fbOddTile+0x118) [0xb739fa48]
9: /usr/lib/xorg/modules/libfb.so (fbTile+0x8c) [0xb739fb0c]
10: /usr/lib/xorg/modules/libfb.so (fbFill+0x36f) [0xb739766f]
11: /usr/lib/xorg/modules/libfb.so (fbPolyFillRect+0x1b4) [0xb7397964]
12: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb73bc000+0x63392) [0xb741f392]
13: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb73bc000+0x5ce0d) [0xb7418e0d]
14: /usr/bin/X (0x8048000+0xd9195) [0x8121195]
15: /usr/bin/X (miPaintWindow+0x1c2) [0x809ef82]
16: /usr/bin/X (miWindowExposures+0xc7) [0x809f317]
17: /usr/bin/X (0x8048000+0x1386d8) [0x81806d8]
18: /usr/bin/X (miHandleValidateExposures+0x78) [0x81b26c8]
19: /usr/bin/X (0x8048000+0x7839f) [0x80c039f]
20: /usr/bin/X (xf86EnableDisableFBAccess+0x74) [0x80c0464]
21: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb73bc000+0x5b412) [0xb7417412]
22: /usr/bin/X (0x8048000+0x144454) [0x818c454]
23: /usr/bin/X (xf86Wakeup+0x23f) [0x80b5a6f]
24: /usr/bin/X (WakeupHandler+0x52) [0x80779f2]
25: /usr/bin/X (WaitForSomething+0x1a2) [0x80a3f92]
26: /usr/bin/X (0x8048000+0x2a1b0) [0x80721b0]
27: /usr/bin/X (0x8048000+0x1ed7a) [0x8066d7a]
28: /lib/tls/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0xb75b6bd6]
29: /usr/bin/X (0x8048000+0x1e961) [0x8066961]


Please advise how to solve this problem

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Freeze when switching user (Intel Graphics, Lenovo W500)
https://bugs.launchpad.net/bugs/590109
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