Xorg crashed with SIGFPE in Phw770_ProgramMemoryTimingParameters() happens when I change the user without logging out the active user

[Accorte]

It is not possible to change the user when another user is still logged in using a gui, terminal sessions are not affected.
I had this bug on Jaunty and still have it on Karmic.
I'm using a ATI HD4890 with a well running fglrx driver.

ProblemType: Crash
Architecture: amd64
CrashCounter: 1
Date: Mon Nov 2 12:04:28 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/Xorg
MachineType: System manufacturer System Product Name
NonfreeKernelModules: fglrx
Package: xserver-xorg-core 2:1.6.4-2ubuntu4 [modified: usr/lib/xorg/modules/extensions/libdri.so usr/lib/xorg/modules/extensions/libglx.so]
ProcCmdLine: root=UUID=258a027a-8976-4f1b-807b-a97136106834 ro quiet splash
ProcCmdline: /usr/bin/X :1 -br -verbose -auth /var/run/gdm/auth-for-gdm-7vkkOI/database -nolisten tcp
ProcEnviron:
 LANG=de_DE.UTF-8
 PATH=(custom, no user)
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu7
 libgl1-mesa-glx 7.6.0-1ubuntu4
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2
 xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu1
Signal: 8
SourcePackage: xorg-server
StacktraceTop:
 Phw770_ProgramMemoryTimingParameters ()
 ?? ()
 PHM_DispatchTable ()
 PHM_SetPowerStateDeferrable ()
 ?? ()
Title: Xorg crashed with SIGFPE in Phw770_ProgramMemoryTimingParameters()
Uname: Linux 2.6.31-14-generic x86_64
UserGroups:

dmi.bios.date: 06/05/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1604
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A78T-E
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1604:bd06/05/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A78T-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
fglrx:
 Nov 2 10:48:48 Shogun kernel: [ 2456.517603] [fglrx:fireglAsyncioIntDisableMsgHandler] *ERROR* IRQMGR returned error 1 when trying to disable interrupt source ff000035
 Nov 2 10:48:48 Shogun kernel: [ 2456.545784] [fglrx:fireglAsyncioIntEnableMsgHandler] *ERROR* IRQMGR returned error 1 when trying to enable interrupt source ff000035
system:
 distro: Ubuntu
 architecture: x86_64kernel: 2.6.31-14-generic

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug report is public and visible to everyone but I noticed that it has an attachment named 'CoreDump.gz'. It is possible that this contains sensitive information so I've set it back to private.

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #449069, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Francis De Brabandere (francisdb)]

What happened to the bug of wich this one is a duplicate? We are having the same issue here at work with non x64 hardware. I usually lock the screen in the evening and since 2 days when trying to log in in the morning X is frozen.