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This didn't happen in 13.10, and incidentally it worked for a few days
with 14.04. It is a hard freeze and I'm forzed to shut down the computer
through the power button. I tried if a fresh system would make it work,
so I booted a live DVD and reproduced the problem.


Apr 25 09:06:07 kensei-blade kernel: [43104.265645] ------------[ cut here ]------------
Apr 25 09:06:07 kensei-blade kernel: [43104.265676] WARNING: CPU: 1 PID: 32505 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_uncore.c:125 gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]()
Apr 25 09:06:07 kensei-blade kernel: [43104.265677] MMIO read or write has been dropped ffffffff
Apr 25 09:06:07 kensei-blade kernel: [43104.265709] Modules linked in: ctr ccm rfcomm bnep binfmt_misc joydev nls_iso8859_1 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp arc4 kvm_intel kvm iwldvm mac80211 psmouse serio_raw uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core lpc_ich videodev snd_hda_codec_hdmi btusb iwlwifi bluetooth thinkpad_acpi cfg80211 nvram snd_seq_midi snd_seq_midi_event snd_hda_codec_conexant snd_hda_intel snd_hda_codec snd_rawmidi snd_hwdep mei_me snd_pcm mei snd_page_alloc snd_seq snd_seq_device snd_timer snd soundcore parport_pc mac_hid ppdev lp parport dm_crypt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw i915 gf128mul glue_helper ablk_helper cryptd i2c_algo_bit drm_kms_helper e1000e ahci sdhci_pci libahci sdhci drm ptp pps_core wmi video
Apr 25 09:06:07 kensei-blade kernel: [43104.265712] CPU: 1 PID: 32505 Comm: kworker/u16:7 Tainted: G        W    3.13.0-24-generic #46-Ubuntu
Apr 25 09:06:07 kensei-blade kernel: [43104.265712] Hardware name: LENOVO 4291MZ1/4291MZ1, BIOS 8DET55WW (1.25 ) 11/01/2011
Apr 25 09:06:07 kensei-blade kernel: [43104.265725] Workqueue: i915 gen6_force_wake_work [i915]
Apr 25 09:06:07 kensei-blade kernel: [43104.265728]  0000000000000009 ffff880210395d38 ffffffff81715a64 ffff880210395d80
Apr 25 09:06:07 kensei-blade kernel: [43104.265729]  ffff880210395d70 ffffffff810676bd ffff88020cd6c020 ffff88020cd6c028
Apr 25 09:06:07 kensei-blade kernel: [43104.265731]  0000000000000246 0000000000000000 0000000000000200 ffff880210395dd0
Apr 25 09:06:07 kensei-blade kernel: [43104.265731] Call Trace:
Apr 25 09:06:07 kensei-blade kernel: [43104.265735]  [<ffffffff81715a64>] dump_stack+0x45/0x56
Apr 25 09:06:07 kensei-blade kernel: [43104.265738]  [<ffffffff810676bd>] warn_slowpath_common+0x7d/0xa0
Apr 25 09:06:07 kensei-blade kernel: [43104.265739]  [<ffffffff8106772c>] warn_slowpath_fmt+0x4c/0x50
Apr 25 09:06:07 kensei-blade kernel: [43104.265750]  [<ffffffffa0194de8>] gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]
Apr 25 09:06:07 kensei-blade kernel: [43104.265759]  [<ffffffffa0194e28>] __gen6_gt_force_wake_put+0x28/0x30 [i915]
Apr 25 09:06:07 kensei-blade kernel: [43104.265767]  [<ffffffffa0194bb7>] gen6_force_wake_work+0x37/0x50 [i915]
Apr 25 09:06:07 kensei-blade kernel: [43104.265770]  [<ffffffff810838a2>] process_one_work+0x182/0x450
Apr 25 09:06:07 kensei-blade kernel: [43104.265772]  [<ffffffff81084641>] worker_thread+0x121/0x410
Apr 25 09:06:07 kensei-blade kernel: [43104.265774]  [<ffffffff81084520>] ? rescuer_thread+0x3e0/0x3e0
Apr 25 09:06:07 kensei-blade kernel: [43104.265775]  [<ffffffff8108b312>] kthread+0xd2/0xf0
Apr 25 09:06:07 kensei-blade kernel: [43104.265777]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0
Apr 25 09:06:07 kensei-blade kernel: [43104.265779]  [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0
Apr 25 09:06:07 kensei-blade kernel: [43104.265781]  [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0
Apr 25 09:06:07 kensei-blade kernel: [43104.265782] ---[ end trace bcf307f8d88d10e7 ]---

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,place,move,compiztoolbox,mousepoll,vpswitch,gnomecompat,resize,imgpng,grid,regex,snap,wall,session,unitymtgrabhandles,animation,workarounds,expo,fade,scale,ezoom,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Fri Apr 25 21:20:23 2014
DistUpgraded: 2014-04-15 18:54:32,489 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21da]
InstallationDate: Installed on 2013-09-18 (219 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: LENOVO 4291MZ1
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to trusty on 2014-04-15 (10 days ago)
dmi.bios.date: 11/01/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET55WW (1.25 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4291MZ1
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET55WW(1.25):bd11/01/2011:svnLENOVO:pn4291MZ1:pvrThinkPadX220:rvnLENOVO:rn4291MZ1:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4291MZ1
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
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
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Fri Apr 25 21:06:08 2014
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               12359 
 vendor                                     SEC
xserver.version: 2:1.15.1-0ubuntu2

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug bios-outdated-1.39 compiz-0.9 trusty ubuntu
-- 
Lenovo X220, hard freeze after pluggin in external monitor through Display Port
https://bugs.launchpad.net/bugs/1312996
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