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[Sabin Iacob <iacobs@xxxxxxxxxxxx>]

More info: when freezes happen, I can move the mouse, but no window
responds; also, switching to a text console works once (it takes about
15-20s to do it).

I was able to run dmesg this time, and it ends with the attached
backtrace; Xorg.0.log says nothing, X thinks everything's fine; it even
logs I'm switching to a text console:

[183594.768] (II) AIGLX: Suspending AIGLX clients for VT switch

Attempting to get back to X (Alt-F7) or to restart lightdm results in an
unusable computer (this time ctrl-alt-Fx no longer works, I have to alt-
sysrq-{s,u,b});

Xorg.0.log.old (the log after "restart lightdm" leaves me with an
unusable machine) ends with this:

[183854.910] (II) GLX: Initialized DRI2 GL provider for screen 0
[183854.912] (II) intel(0): switch to mode 1920x1080@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none


** Attachment added: "backtrace from dmesg"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402401/+attachment/4331283/+files/backtrace.txt

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https://bugs.launchpad.net/bugs/1402401

Title:
  Xorg freeze when switching to text console and back

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Sometimes the computer becomes unresponsive after switching to a text
  console and back; this seems to be an Xorg and / or kernel driver
  crash (there is a backtrace in dmesg that seems to be from Intel
  drivers).

  The rest of the system worked fine, I could SSH into it and restart
  Xorg. I had an (html5) Youtube video playing in Firefox when the
  lockup happened, I'll try to see if that was the culprit (I switched a
  few times to text console and back after restarting X and all was
  fine, but I didn't have a video running)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xorg 1:7.7+7ubuntu2
  ProcVersionSignature: Ubuntu 3.16.0-28.37-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  BootLog:
   * Setting up X socket directories...        
[ OK ]
    * Restoring resolver state...        
[ OK ]
   Starting supervisor:
  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: Sun Dec 14 17:47:30 2014
  DistUpgraded: Fresh install
  DistroCodename: utopic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:13ad]
  InstallationDate: Installed on 2014-12-05 (8 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 03eb:8a03 Atmel Corp. 
   Bus 001 Device 003: ID 1bcf:2987 Sunplus Innovation Technology Inc. 
   Bus 001 Device 007: ID 8087:07dc Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. UX302LG
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-28-generic.efi.signed root=UUID=a49261fe-9402-40b2-8860-682a094ceec1 ro rootflags=subvol=@ quiet splash acpi_osi= vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/30/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX302LG.207
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX302LG
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX302LG.207:bd10/30/2013:svnASUSTeKCOMPUTERINC.:pnUX302LG:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX302LG:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: UX302LG
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Sun Dec 14 17:44:52 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1507 
   vendor                                     BOE
  xserver.version: 2:1.16.0-1ubuntu1.2

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