Change login while other user is logged in: sometimes crashes/freezes/hangs

[LaunchpadUser]

When trying to login with a user account while another user is already logged in, Ubuntu sometimes crashes/hanges/freezes!

This bug exists for many years, so for many Ubuntu versions - even in the latest LTS versions with fresh standard installation (Unity), 64 Bit. During the years of this bug, I had different computers (hardware) with different graphics cards (nVidia, AMD) different Ubuntus (32 Bit, 64 Bit, LTS, non-LTS). This bug bugs us for so many years because we have two computers (exchanged every couple of years with fresh Ubuntu installations) that each has multiple login accounts (for all family members). Every once in a while one user wants to login while another is already logged in. The login screen allowws to login while another user is logged in, so this should basically work. Other scenario is, the the logged in user simple loggs in to another user via the system menu (top right).

The results are miscellanious: sometimes it works, sometimes, the graphics get distorted, sometimes, the screen just turns black (sometimes with a white cursopr line blinking), sometimes it freezes, sometimes it crashes. All in all: it's very unstable and buggy.

Last messages in /var/log/kernel.log:

---------------------
...
Jun 15 19:53:11 PC-M kernel: [ 17.365242] type=1400 audit(1434390791.618:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=867 comm="apparmor_parser"
Jun 15 19:53:11 PC-M kernel: [ 17.365253] type=1400 audit(1434390791.618:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cupsd" pid=867 comm="apparmor_parser"
Jun 15 19:53:11 PC-M kernel: [ 17.365575] type=1400 audit(1434390791.618:10): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=867 comm="apparmor_parser"
Jun 15 19:53:11 PC-M kernel: [ 17.417132] r8169 0000:01:00.0 eth0: link down
Jun 15 19:53:11 PC-M kernel: [ 17.417157] r8169 0000:01:00.0 eth0: link down
Jun 15 19:53:11 PC-M kernel: [ 17.417203] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
Jun 15 19:53:11 PC-M kernel: [ 17.417589] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
Jun 15 19:53:11 PC-M kernel: [ 17.429647] type=1400 audit(1434390791.682:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/lightdm/lightdm-guest-session" pid=923 comm="apparmor_parser"
Jun 15 19:53:12 PC-M kernel: [ 18.455730] fglrx_pci 0000:00:01.0: irq 86 for MSI/MSI-X
Jun 15 19:53:12 PC-M kernel: [ 18.456922] <6>[fglrx] Firegl kernel thread PID: 1358
Jun 15 19:53:12 PC-M kernel: [ 18.457010] <6>[fglrx] Firegl kernel thread PID: 1359
Jun 15 19:53:12 PC-M kernel: [ 18.457112] <6>[fglrx] Firegl kernel thread PID: 1360
Jun 15 19:53:12 PC-M kernel: [ 18.457222] <6>[fglrx] IRQ 86 Enabled
Jun 15 19:53:12 PC-M kernel: [ 18.465425] <6>[fglrx] Reserved FB block: Shared offset:0, size:1000000
Jun 15 19:53:12 PC-M kernel: [ 18.465427] <6>[fglrx] Reserved FB block: Unshared offset:f9b4000, size:4000
Jun 15 19:53:12 PC-M kernel: [ 18.465429] <6>[fglrx] Reserved FB block: Unshared offset:f9b8000, size:548000
Jun 15 19:53:12 PC-M kernel: [ 18.465430] <6>[fglrx] Reserved FB block: Unshared offset:ff00000, size:100000
Jun 15 19:53:12 PC-M kernel: [ 18.465431] <6>[fglrx] Reserved FB block: Unshared offset:7ffd7000, size:29000
Jun 15 19:53:12 PC-M kernel: [ 18.520520] <6>[fglrx] ATIF platform detected with notification ID: 0x81
Jun 15 19:53:13 PC-M kernel: [ 18.962467] <3>[fglrx:IRQMGR_callback_hifreq_interrupt] *ERROR* irqSourceID = 0x60000400 is unknown
Jun 15 19:53:13 PC-M kernel: [ 19.553859] r8169 0000:01:00.0 eth0: link up
Jun 15 19:53:13 PC-M kernel: [ 19.553876] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
Jun 15 19:53:41 PC-M kernel: [ 47.439360] audit_printk_skb: 153 callbacks suppressed
Jun 15 19:53:41 PC-M kernel: [ 47.439363] type=1400 audit(1434390821.722:63): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=3231 comm="apparmor_parser"
Jun 15 19:53:41 PC-M kernel: [ 47.439370] type=1400 audit(1434390821.722:64): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=3231 comm="apparmor_parser"
Jun 15 19:53:41 PC-M kernel: [ 47.439688] type=1400 audit(1434390821.722:65): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=3231 comm="apparmor_parser"
----------------------

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18
Uname: Linux 3.13.0-52-generic x86_64
NonfreeKernelModules: fglrx
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CompizPlugins: [core,composite,opengl,maximumize,compiztoolbox,decor,resize,gnomecompat,snap,grid,move,imgpng,extrawm,vpswitch,unitymtgrabhandles,place,mousepoll,wall,regex,session,animation,fade,expo,workarounds,scale,ezoom,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Jun 15 20:23:28 2015
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus: fglrx-updates-core, 15.200, 3.13.0-52-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Kaveri [Radeon R7 200 Series] [1002:130f] (prog-if 00 [VGA controller])
   Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:0123]
InstallationDate: Installed on 2014-09-13 (274 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-52-generic root=UUID=45c777b5-e370-47a4-b762-bd3254d9699e ro nomodeset quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg crash
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/25/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F5c MX
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: F2A88X-D3H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF5cMX:bd03/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnF2A88X-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Mon Jun 15 19:53:12 2015
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 AIGLX error: failed to open /usr/X11R6/lib64/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib64/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
 AIGLX error: failed to open /usr/lib64/dri/fglrx_dri.so, error[/usr/lib64/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
 AIGLX error: failed to open /usr/X11R6/lib/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2.7
xserver.video_driver: fglrx

[LaunchpadUser (lpusr)]

@Christopher M. Penalver: "bios-outdated"? This computer is only 9 months old! And just to remember: this bug occured on my older computer's, too.

[penalvch (penalvch)]

LaunchpadUser, thank you for reporting this and helping make Ubuntu better.

As per http://www.gigabyte.com/products/product-page.aspx?pid=4714#bios an update to your computer's buggy and outdated BIOS is available (F6). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?

If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette .

Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report.

Once the BIOS is updated, and the information above is provided, then please mark this report Status New.

Thank you for your understanding.

[LaunchpadUser (lpusr)]

I don't see any point doing such a risky thing like updating a bios! This bug I described is for years in Ubuntu - with 6 different computers (2 * 3), different CPUs, different chipsets, different graphics cards, different RAM, etc.! I does not have to do anything with the BIOS.

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]