power : gnome-settings-daemon crashed with SIGSEGV in gnome_rr_screen_get_dpms_mode

This crash has the same stack trace characteristics as bug #956824. However, the latter was already fixed in an earlier package version than the one in this report. This might be a regression or because the problem is in a dependent package.

Status changed to 'Confirmed' because the bug affects multiple users.

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/971353

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This bug has been reported on the Ubuntu localized ISO testing tracker.

A list of all reports related to this bug can be found here:
http://localized-iso.qa.ubuntu.com/qatracker/reports/bugs/971353

bug I D doesn't fix it

This also affects Quantal Ubuntu12.10 64bit on system start. System updated to 18.7.2012 - today.

It happends on a HP 655 Laptop which is relative new hardware, also with dedicated AMD HD 7000 series graphic.

Subscribed..
It happens with my system

AMD Phenom II X4 945
2X2GB DDR III 1333mhz
Asus M4A785TD-M Evo
Gigabyte HD 7850 OC version

Software: Ubuntu 12.04, Kernel 3.2.0.20, 32bits/64bits (problem happens in both)

When I start Ubuntu its all ok
I open firefox, go to youtube, play a video, and firefox crash
Close session, ubuntu crash, the login screen appears to choose the user, but i cant do anything.
Anything that may use some 3d acceleration like changing workspace, crashes

This is a very serious problem, since i need to use windows to work in my desktop

Thanks

Status changed to 'Confirmed' because the bug affects multiple users.

OK, I think I know why this is happening, though I can't reproduce myself. I have uploaded gnome-settings-daemon 3.4.2-0ubuntu12 to quantal-proposed. I'd really appreciate testing by those that get this crash. I'm confident, but not certain I've got the right fix.

[Gory details if you happen to know the code] The idletime signals are firing after the power manager is stopped. idletime is a singleton that hands out references to itself every time it is 'created'. And stop() is expecting a mere unref() to disconnect the signals. But it doesn't if idletime has been reffed more times. So this patch manually disconnect the signals we set up.

This occurred again when quantal-desktop-amd64+mac.iso of 20120905.2 during a live session. Just tried to do some settings change during the live session, such as changing the keyboard layout, timezone change. If it does not occur leave it for some time and this would occur.

ALSO, reported a couple of bugs before for amd64+mac with the crash files but made invalid due to uncompatible symbol files. So may be that need to be looked at as well for live sessions not containing the correct symbol files.
Thanks

The same again during the live session on amd64 hardware. 20120905.2

This doesn't seem reliably reproducable, so I'm just going to mark this Fix Released and see if it still gets reported.

gnome-settings-daemon (3.4.2-0ubuntu12) quantal-proposed; urgency=low

  * debian/patches/bugzilla_segfault_dpms.patch:
    - Update to cover another way to get the same segfault. (LP: #971353)

The Precise Pangolin has reached end of life, so this bug will not be fixed for that release