Ok two more things:
(a) strike the comments about garbling: this just happens when I switch to a
text console too quickly after gdm starts (so the video is probably still
initializing?). It also happens when X is nicely on vt7 and it doesn't happen
with X on vt2, but with enough delay before switching to vt1. So, I'm guessing:
unrelated
(b) established that when triggering the crash using the Enter key
instead of '2' I get the other backtrace that I remembered from back in
the beginning of my analyzing this bug (I think start/mid july). I
reproduced this twice, and a third time from a perfectly normal vt7
session by manually going to vt1 and forcing isig on (stty -F /dev/tty7
isig):
(II) Sep 10 01:11:00 NVIDIA(0): Setting mode
"CRT:1280x1024_75+0+0,DFP:2048x1152+1280+0"
(II) Power Button: Device reopened after 1 attempts.
(II) Power Button: Device reopened after 1 attempts.
(II) Logitech Optical USB Mouse: Device reopened after 1 attempts.
(II) AT Translated Set 2 keyboard: Device reopened after 1 attempts.
(II) Macintosh mouse button emulation: Device reopened after 1 attempts.
Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e938b]
1: /usr/bin/X (0x8048000+0x61c8d) [0x80a9c8d]
2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb784f410]
3: /usr/bin/X (0x8048000+0x2a1b0) [0x80721b0]
4: /usr/bin/X (0x8048000+0x1ed7a) [0x8066d7a]
5: /lib/tls/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0xb7579bd6]
6: /usr/bin/X (0x8048000+0x1e961) [0x8066961]
Caught signal 3 (Quit). Server aborting
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional
information.
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Logitech Optical USB Mouse: Close
(II) UnloadModule: "evdev"
(II) AT Translated Set 2 keyboard: Close
(II) UnloadModule: "evdev"
(II) Macintosh mouse button emulation: Close
(II) UnloadModule: "evdev"
ddxSigGiveUp: Closing log
--
X starts on wrong tty: pressing enter after 5 minutes crashes X
https://bugs.launchpad.net/bugs/625239
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