touch-packages team mailing list archive

Thread
Date
[Bug 1452255] Re: Xorg freeze - on lockscreen

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sun, 10 May 2015 02:00:02 -0000
Reply-to: Bug 1452255 <1452255@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Páll Haraldsson, thank you for reporting this and helping make Ubuntu
better. As per http://www.dell.com/support/home/us/en/19/product-
support/product/precision-t1650/drivers an update to your computer's
buggy and outdated BIOS is available (A18). 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 Confirmed.

Thank you for your understanding.

** Tags added: bios-outdated-a18

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1452255

Title:
  Xorg freeze - on lockscreen

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  What I know for sure:

  Locked screen - machine was frozen when I got back after
  minutes/seconds. Has happened several times before but does not happen
  most/all of the time.

  Of course very annoying (so I'll switch from nouveau to propriatary as
  a desperate move.. I really do not want to, would rather file bugs and
  see them fixed. Filing is what I can do, do not trust myself to fix or
  debug as random. I may move back if it helps with debugging).

  I wouldn't have thought Xorg was to blame (maybe it isn't) as machine
  only freezes this way when I lock screen (yes, I get oom for chrome
  and "almost freezes", but can get to a virtual terminal - eventually,
  but that is different). Also I've reported other bug about lockscreen
  where password field if missing. This seems unrelated as here it is
  not. In hte other bug the mouse pointer may not have been frozen (I
  can't remember for sure).

  [I have dual-screen, not sure if important - seemed to be for other
  bug..]

  CAPS LOCK etc. lights are frozen and can't go to virtual screen. Still
  FLock light toggles, I think only the keyboard handles that..

  Going over updates not installed, nothing important seems missing (as
  the update-manager shows *now*), I frequently do not update
  everything.

  E.g. libdrm-intel1 should not matter, I updated nouveau version
  recently:

  2015-04-21 13:47:52 status installed libdrm-nouveau2:amd64
  2.4.60-2~ubuntu14.04.1

  and booted before getting the freeze but at least this was updated but
  not rebooted before the freeze:

  2015-05-04 09:35:32 upgrade libmetacity-private0a:amd64 1:2.34.13-0ubuntu4 1:2.34.13-0ubuntu4.1
  2015-05-04 09:35:33 upgrade metacity-common:all 1:2.34.13-0ubuntu4 1:2.34.13-0ubuntu4.1

  Last rebootprior to freeze(?):

  $ who -b /var/log/wtmp.1 |tail -1
           system boot  2015-04-28 14:11

  While I get no response to (other) keys, I see that the kernel sees
  them in syslog (all relevant there starting w/nouveau):.

  May  6 09:55:01 Vinnuryksugan CRON[14155]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  May  6 10:05:01 Vinnuryksugan CRON[14305]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  May  6 10:10:27 Vinnuryksugan kernel: [677054.614186] nouveau E[compiz[2344]] fail ttm_validate
  May  6 10:10:27 Vinnuryksugan kernel: [677054.614191] nouveau E[compiz[2344]] validate vram_list
  May  6 10:10:27 Vinnuryksugan kernel: [677054.614201] nouveau E[compiz[2344]] validate: -12
  May  6 10:10:28 Vinnuryksugan kernel: [677055.299662] nouveau E[   PFIFO][0000:01:00.0] read fault at 0x0007740000 [PAGE_NOT_PRESENT] from PGRAPH/GPC0/TEX on channel 0x001fcba000 [compiz[2344]]
  May  6 10:10:28 Vinnuryksugan kernel: [677055.299688] nouveau E[  PGRAPH][0000:01:00.0] TRAP ch 4 [0x001fcba000 compiz[2344]]
  May  6 10:10:28 Vinnuryksugan kernel: [677055.299699] nouveau E[  PGRAPH][0000:01:00.0] GPC0/TPC0/TEX: 0x80000049
  May  6 10:10:28 Vinnuryksugan kernel: [677055.299703] nouveau E[  PGRAPH][0000:01:00.0] GPC0/TPC1/TEX: 0x80000049
  May  6 10:12:01 Vinnuryksugan CRON[14409]: (root) CMD (export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin && [ -x /usr/sbin/uptrack-upgrade ] && /usr/sbin/uptrack-upgrade --cron)
  May  6 10:12:09 Vinnuryksugan kernel: [677156.263221] nouveau E[Xorg[1177]] failed to idle channel 0xcccc0001 [Xorg[1177]]
  May  6 10:12:24 Vinnuryksugan kernel: [677171.270132] nouveau E[Xorg[1177]] failed to idle channel 0xcccc0001 [Xorg[1177]]
  May  6 10:12:26 Vinnuryksugan kernel: [677173.271187] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:12:41 Vinnuryksugan kernel: [677188.277961] nouveau E[Xorg[1177]] failed to idle channel 0xcccc0000 [Xorg[1177]]
  May  6 10:12:56 Vinnuryksugan kernel: [677203.284882] nouveau E[Xorg[1177]] failed to idle channel 0xcccc0000 [Xorg[1177]]
  May  6 10:12:58 Vinnuryksugan kernel: [677205.285829] nouveau E[   PFIFO][0000:01:00.0] channel 2 [Xorg[1177]] kick timeout
  May  6 10:12:58 Vinnuryksugan kernel: [677205.286008] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:13:00 Vinnuryksugan kernel: [677207.286827] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:13:04 Vinnuryksugan colord: device removed: xrandr-Dell Inc.-DELL P2312H-YJ3JX33IAFJM
  May  6 10:13:04 Vinnuryksugan colord: device removed: xrandr-Dell Inc.-DELL P2312H-YJ3JX33IAF8M
  May  6 10:13:04 Vinnuryksugan colord: Profile removed: icc-9b9c44d46f4e90a2402855cc59555af8
  May  6 10:13:04 Vinnuryksugan colord: Profile removed: icc-3c48fbaae41e31eb84074e6302c31a9d
  May  6 10:13:05 Vinnuryksugan gnome-session[2135]: Gdk-WARNING: gnome-session: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.#012
  May  6 10:13:06 Vinnuryksugan gdm-simple-slave[1107]: Child process 1177 was already dead.
  May  6 10:13:06 Vinnuryksugan gdm-simple-slave[1107]: GLib: Source ID 4 was not found when attempting to remove it
  May  6 10:13:06 Vinnuryksugan gdm-simple-slave[1107]: GLib-GObject: g_object_ref: assertion 'object->ref_count > 0' failed
  May  6 10:13:06 Vinnuryksugan gdm-simple-slave[1107]: GLib-GObject: g_object_unref: assertion 'object->ref_count > 0' failed
  May  6 10:13:06 Vinnuryksugan pulseaudio[14457]: [pulseaudio] client-conf-x11.c: xcb_connection_has_error() returned true
  May  6 10:13:07 Vinnuryksugan pulseaudio[14466]: [pulseaudio] pid.c: Stale PID file, overwriting.
  May  6 10:13:08 Vinnuryksugan pulseaudio[14466]: [pulseaudio] server-lookup.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-zJlDUz1mMS: Connection ref
  used
  May  6 10:13:08 Vinnuryksugan pulseaudio[14466]: [pulseaudio] main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-zJlDUz1mMS: Connection refused
  May  6 10:13:19 Vinnuryksugan kernel: [677226.399528] nouveau E[compiz[2344]] failed to idle channel 0xcccc0000 [compiz[2344]]
  May  6 10:13:34 Vinnuryksugan kernel: [677241.406436] nouveau E[compiz[2344]] failed to idle channel 0xcccc0000 [compiz[2344]]
  May  6 10:13:34 Vinnuryksugan kernel: [677241.406569] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:13:36 Vinnuryksugan kernel: [677243.407384] nouveau E[   PFIFO][0000:01:00.0] channel 4 [compiz[2344]] kick timeout
  May  6 10:13:36 Vinnuryksugan kernel: [677243.407509] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:13:38 Vinnuryksugan kernel: [677245.408327] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:13:38 Vinnuryksugan kernel: [677245.408344] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000001: 0x0000000b
  May  6 10:13:53 Vinnuryksugan kernel: [677260.463213] nouveau E[chromium-browse[7553]] failed to idle channel 0xcccc0000 [chromium-browse[7553]]
  May  6 10:14:04 Vinnuryksugan kernel: [677271.585741] usb 1-1.2: USB disconnect, device number 6
  May  6 10:14:08 Vinnuryksugan kernel: [677275.470125] nouveau E[chromium-browse[7553]] failed to idle channel 0xcccc0000 [chromium-browse[7553]]
  May  6 10:14:10 Vinnuryksugan kernel: [677277.471035] nouveau E[   PFIFO][0000:01:00.0] channel 5 [chromium-browse[7553]] kick timeout
  May  6 10:14:10 Vinnuryksugan kernel: [677277.471191] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:14:12 Vinnuryksugan kernel: [677279.472005] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:14:12 Vinnuryksugan kernel: [677279.688294] usb 1-1.2: new low-speed USB device number 7 using ehci-pci
  May  6 10:14:12 Vinnuryksugan kernel: [677279.716460] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:14:12 Vinnuryksugan kernel: [677279.784339] usb 1-1.2: New USB device found, idVendor=0461, idProduct=4e22
  May  6 10:14:12 Vinnuryksugan kernel: [677279.784344] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  May  6 10:14:12 Vinnuryksugan kernel: [677279.784347] usb 1-1.2: Product: USB Optical Mouse
  May  6 10:14:12 Vinnuryksugan kernel: [677279.784350] usb 1-1.2: Manufacturer: PixArt
  May  6 10:14:12 Vinnuryksugan kernel: [677279.786693] input: PixArt USB Optical Mouse as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/input/input15
  May  6 10:14:12 Vinnuryksugan kernel: [677279.787045] hid-generic 0003:0461:4E22.0005: input,hidraw0: USB HID v1.11 Mouse [PixArt USB Optical Mouse] on usb-0000:00:1a.0-1.2/input0
  May  6 10:14:12 Vinnuryksugan mtp-probe: checking bus 1, device 7: "/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2"
  May  6 10:14:12 Vinnuryksugan mtp-probe: bus: 1, device: 7 was not an MTP device
  May  6 10:14:14 Vinnuryksugan kernel: [677281.717275] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:14:15 Vinnuryksugan kernel: [677282.174687] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:14:17 Vinnuryksugan kernel: [677284.175505] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:14:25 Vinnuryksugan gdm-simple-slave[14460]: Failed to give slave programs access to the display. Trying to proceed.
  May  6 10:14:26 Vinnuryksugan kernel: [677293.368714] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:14:28 Vinnuryksugan kernel: [677295.369530] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:15:01 Vinnuryksugan CRON[14560]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  May  6 10:15:30 Vinnuryksugan kernel: [677357.059699] nouveau E[gnome-session-c[14557]] failed to idle channel 0xcccc0000 [gnome-session-c[14557]]
  May  6 10:15:45 Vinnuryksugan kernel: [677372.066616] nouveau E[gnome-session-c[14557]] failed to idle channel 0xcccc0000 [gnome-session-c[14557]]
  May  6 10:16:00 Vinnuryksugan kernel: [677387.073528] nouveau E[gnome-session-c[14557]] failed to idle channel 0xcccc0000 [gnome-session-c[14557]]
  May  6 10:16:00 Vinnuryksugan kernel: [677387.073569] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:16:02 Vinnuryksugan kernel: [677389.074382] nouveau E[   PFIFO][0000:01:00.0] channel 4 [gnome-session-c[14557]] kick timeout
  May  6 10:16:17 Vinnuryksugan kernel: [677404.081362] nouveau E[gnome-session-c[14557]] failed to idle channel 0xcccc0000 [gnome-session-c[14557]]
  May  6 10:16:32 Vinnuryksugan kernel: [677419.088273] nouveau E[gnome-session-c[14557]] failed to idle channel 0xcccc0000 [gnome-session-c[14557]]
  May  6 10:16:32 Vinnuryksugan kernel: [677419.088531] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:16:34 Vinnuryksugan kernel: [677421.089347] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:16:34 Vinnuryksugan kernel: [677421.089362] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000001: 0x0000000b
  May  6 10:16:34 Vinnuryksugan dbus[801]: [system] Activating service name='org.freedesktop.systemd1' (using servicehelper)
  May  6 10:16:34 Vinnuryksugan dbus[801]: [system] Successfully activated service 'org.freedesktop.systemd1'
  May  6 10:17:01 Vinnuryksugan CRON[14581]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
  May  6 10:17:02 Vinnuryksugan rtkit-daemon[1753]: Successfully made thread 14592 of process 14592 (n/a) owned by '117' high priority at nice level -11.
  May  6 10:17:02 Vinnuryksugan rtkit-daemon[1753]: Supervising 1 threads of 1 processes of 1 users.
  May  6 10:17:03 Vinnuryksugan kernel: [677450.207824] nouveau W[   PFIFO][0000:01:00.0] INTR 0x00000100: 0x0000000d
  May  6 10:17:03 Vinnuryksugan rtkit-daemon[1753]: Successfully made thread 14593 of process 14592 (n/a) owned by '117' RT at priority 5.
  May  6 10:17:03 Vinnuryksugan rtkit-daemon[1753]: Supervising 2 threads of 1 processes of 1 users.
  May  6 10:17:03 Vinnuryksugan rtkit-daemon[1753]: Successfully made thread 14594 of process 14592 (n/a) owned by '117' RT at priority 5.
  May  6 10:17:03 Vinnuryksugan rtkit-daemon[1753]: Supervising 3 threads of 1 processes of 1 users.
  May  6 10:17:03 Vinnuryksugan rtkit-daemon[1753]: Successfully made thread 14595 of process 14592 (n/a) owned by '117' RT at priority 5.
  May  6 10:17:03 Vinnuryksugan rtkit-daemon[1753]: Supervising 4 threads of 1 processes of 1 users.
  May  6 10:17:03 Vinnuryksugan dbus[801]: [system] Activating service name='org.freedesktop.locale1' (using servicehelper)
  May  6 10:17:03 Vinnuryksugan dbus[801]: [system] Successfully activated service 'org.freedesktop.locale1'
  May  6 10:17:03 Vinnuryksugan colord: Device added: xrandr-Dell Inc.-DELL P2312H-YJ3JX33IAFJM
  May  6 10:17:03 Vinnuryksugan colord: Device added: xrandr-Dell Inc.-DELL P2312H-YJ3JX33IAF8M
  May  6 10:17:04 Vinnuryksugan colord: Automatic metadata add icc-799564c0107355c0f4007c3910253060 to xrandr-Dell Inc.-DELL P2312H-YJ3JX33IAF8M
  May  6 10:17:04 Vinnuryksugan colord: Profile added: icc-799564c0107355c0f4007c3910253060
  May  6 10:17:04 Vinnuryksugan colord: Automatic metadata add icc-2b5aa3f9718945e86771e4a6e1232885 to xrandr-Dell Inc.-DELL P2312H-YJ3JX33IAFJM
  May  6 10:17:04 Vinnuryksugan colord: Profile added: icc-2b5aa3f9718945e86771e4a6e1232885
  May  6 10:17:05 Vinnuryksugan kernel: [677452.208642] nouveau E[   PFIFO][0000:01:00.0] playlist update failed
  May  6 10:17:09 Vinnuryksugan kernel: [677456.673397] nouveau E[   PDISP][0000:01:00.0][0xc000857d][ffff880211de5100] channel stalled
  May  6 10:17:37 Vinnuryksugan kernel: [677484.972754] type=1400 audit(1430907457.872:100): apparmor="DENIED" operation="mkdir" profile="/usr/lib/telepathy/mission-control-5" name="/var/lib/gdm/.config/libaccounts-glib/" pid=14693 comm="mission-control" requested_mask="c" denied_mask="c" fsuid=117 ouid=117
  May  6 10:17:37 Vinnuryksugan kernel: [677484.986245] type=1400 audit(1430907457.884:101): apparmor="DENIED" operation="open" profile="/usr/lib/telepathy/mission-control-5" name="/etc/dconf/profile/gdm" pid=14693 comm="mission-control" requested_mask="r" denied_mask="r" fsuid=117 ouid=0
  May  6 10:25:01 Vinnuryksugan CRON[14709]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  May  6 10:35:01 Vinnuryksugan CRON[14724]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  May  6 10:42:01 Vinnuryksugan CRON[14735]: (root) CMD (export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin && [ -x /usr/sbin/uptrack-upgrade ] && /usr/sbin/uptrack-upgrade --cron)

  May  6 10:42:14 Vinnuryksugan kernel: [678955.138736] atkbd serio0: Unknown key released (translated set 2, code 0xbb on isa0060/serio0).
  May  6 10:42:14 Vinnuryksugan kernel: [678955.138737] atkbd serio0: Use 'setkeycodes e03b <keycode>' to make it known.
  May  6 10:42:14 Vinnuryksugan kernel: [678962.074702] nouveau E[     DRM] GPU lockup - switching to software fbcon
  ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@May  6 10:43:17 Vinnuryksugan rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="464" x-info="http://www.rsyslog.com";] start
  May  6 10:43:17 Vinnuryksugan rsyslogd: rsyslogd's groupid changed to 104
  May  6 10:43:17 Vinnuryksugan rsyslogd: rsyslogd's userid changed to 101
  May  6 10:43:17 Vinnuryksugan kernel: [    0.000000] Initializing cgroup subsys cpuset

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.13.0-51.84-generic 3.13.11-ckt18
  Uname: Linux 3.13.0-51-generic x86_64
  .tmp.unity.support.test.0:

  .tmp.unity.support.test.1:

  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed May  6 10:59:59 2015
  DistUpgraded: 2015-03-19 11:34:13,727 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Once a week
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Since a couple weeks or more
  GraphicsCard:
   NVIDIA Corporation GF108GL [Quadro 600] [10de:0df8] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: NVIDIA Corporation Device [10de:0835]
  InstallationDate: Installed on 2014-08-26 (252 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Precision T1650
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-51-generic root=UUID=b342558f-2de5-4795-857d-67d51db3a726 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to trusty on 2015-03-19 (47 days ago)
  dmi.bios.date: 01/31/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0X9M3X
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A04
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd01/31/2013:svnDellInc.:pnPrecisionT1650:pvr01:rvnDellInc.:rn0X9M3X:rvrA04:cvnDellInc.:ct6:cvr:
  dmi.product.name: Precision T1650
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
  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 2:2.99.910-0ubuntu1.5
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Wed May  6 10:43:34 2015
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        PixArt USB Optical Mouse MOUSE, id 8
   input        AT Translated Set 2 keyboard KEYBOARD, id 9
   input        PixArt USB Optical Mouse MOUSE, id 8
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2.7
  xserver.video_driver: nouveau

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1452255/+subscriptions
References

[Bug 1452255] [NEW] Xorg freeze - on lockscreen
From: Páll Haraldsson, 2015-05-06