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Connected a 2nd display to my Lenovo laptop. The connection was done via
the DisplayPort. Changed a little via System Settings > Displays to make
this connected display the primary and to have the launcher and the app
hung.

Found this in syslog:

Apr  3 08:09:28 thonov-ubuntu kernel: [62647.671484] unity-control-c[22376]: segfault at 0 ip 00007f85fed4bf73 sp 00007fffd8712740 error 4 in libdisplay.so[7f85fed43000+16000]
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676143] BUG: unable to handle kernel paging request at ffffc90018d6a000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676181] IP: [<ffffffff813682fa>] memmove+0x4a/0x1a0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676209] PGD 21580d067 PUD 21580e067 PMD 104eb7067 PTE 0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676236] Oops: 0002 [#1] SMP
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676253] Modules linked in: btrfs raid6_pq xor ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c hid_generic ctr ccm pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) arc4 iwldvm mac80211 cdc_mbim cdc_ncm usbnet mii cdc_wdm cdc_acm uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core rfcomm bnep videodev btusb bluetooth joydev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper snd_hda_codec_hdmi ablk_helper cryptd psmouse snd_seq_midi snd_seq_midi_event serio_raw thinkpad_acpi snd_rawmidi nvram snd_hda_codec_conexant snd_hda_intel lpc_ich snd_hda_codec snd_hwdep iwlwifi snd_seq cfg80211 snd_pcm snd_seq_device mei_me snd_page_alloc mei snd_timer snd soundcore mac_hid lp parport hid_logitech_dj usbhid hid i915 i2c_algo_bit ahci drm_kms_helper firewire_ohci libahci e1000e drm firewire_core sdhci_pci sdhci ptp crc_itu_t pps_core wmi video
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676720] CPU: 1 PID: 22376 Comm: unity-control-c Tainted: GF       W  O 3.13.0-20-generic #42-Ubuntu
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676763] Hardware name: LENOVO 42433ZG/42433ZG, BIOS 8AET64WW (1.44 ) 07/26/2013
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676798] task: ffff8800ba710000 ti: ffff880102d2a000 task.ti: ffff880102d2a000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676828] RIP: 0010:[<ffffffff813682fa>]  [<ffffffff813682fa>] memmove+0x4a/0x1a0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676863] RSP: 0000:ffff880102d2ba48  EFLAGS: 00010283
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676886] RAX: ffffc90018d6a000 RBX: ffffc90018d6a034 RCX: ffffc90018d6a000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676917] RDX: fffffffffffffff4 RSI: ffffc90018d69fec RDI: ffffc90018d6a000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676948] RBP: ffff880102d2bab8 R08: 626f6762696c2f75 R09: 6e672d78756e696c
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.676980] R10: 2d34365f3638782f R11: 62696c2f7273752f R12: 00000000ffffffcc
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677013] R13: 0000000000000034 R14: ffffc90018d5e470 R15: ffff8801006eecc0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677085] FS:  00007f862e7d09c0(0000) GS:ffff88021e240000(0000) knlGS:0000000000000000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677122] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677145] CR2: ffffc90018d6a000 CR3: 000000010f166000 CR4: 00000000000427e0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677172] Stack:
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677181]  ffffffff8121062e 000110008109ded4 ffffc90018d5f2c8 ffff880102d2bb48
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677219]  ffff8800ba710000 00000000000062c8 ffff8800000062c8 ffffc90018d59000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677254]  ffff880100000383 ffff88020e1f92c0 ffff8800ba710000 0000000000000000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677289] Call Trace:
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677305]  [<ffffffff8121062e>] ? fill_note_info.isra.7+0x65e/0x830
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677334]  [<ffffffff812108c0>] elf_core_dump+0xc0/0x840
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677361]  [<ffffffff81716b79>] ? schedule+0x29/0x70
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677384]  [<ffffffff81715dc9>] ? schedule_timeout+0x239/0x2d0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677415]  [<ffffffff81217821>] do_coredump+0xb41/0xe90
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677442]  [<ffffffff81078dec>] ? force_sig_info+0xcc/0xe0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677470]  [<ffffffff8107a037>] get_signal_to_deliver+0x1c7/0x6f0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677501]  [<ffffffff81013448>] do_signal+0x48/0x960
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677528]  [<ffffffff8111128c>] ? acct_account_cputime+0x1c/0x20
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677559]  [<ffffffff8109d71b>] ? account_user_time+0x8b/0xa0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677589]  [<ffffffff8109dd34>] ? vtime_account_user+0x54/0x60
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677619]  [<ffffffff81013dc9>] do_notify_resume+0x69/0xb0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677650]  [<ffffffff8171acfc>] retint_signal+0x48/0x8c
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677676] Code: 00 00 48 81 fa a8 02 00 00 72 05 40 38 fe 74 41 48 83 ea 20 48 83 ea 20 4c 8b 1e 4c 8b 56 08 4c 8b 4e 10 4c 8b 46 18 48 8d 76 20 <4c> 89 1f 4c 89 57 08 4c 89 4f 10 4c 89 47 18 48 8d 7f 20 73 d4
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677818] RIP  [<ffffffff813682fa>] memmove+0x4a/0x1a0
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677846]  RSP <ffff880102d2ba48>
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.677864] CR2: ffffc90018d6a000
Apr  3 08:09:28 thonov-ubuntu kernel: [62647.686309] ---[ end trace b3bc75c9422de327 ]---

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
Uname: Linux 3.13.0-20-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14-0ubuntu1
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: Thu Apr  3 08:10:49 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21cf]
InstallationDate: Installed on 2014-03-26 (7 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140325.1)
MachineType: LENOVO 42433ZG
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-20-generic root=UUID=c3c7f36f-ca42-443e-819f-5553fe3d040a ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/26/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 8AET64WW (1.44 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42433ZG
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:bvr8AET64WW(1.44):bd07/26/2013:svnLENOVO:pn42433ZG:pvrThinkPadT520:rvnLENOVO:rn42433ZG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42433ZG
dmi.product.version: ThinkPad T520
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.11+14.04.20140328-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
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: Wed Apr  2 14:44:01 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               16561
 vendor                                     LEN
xserver.version: 2:1.15.0-1ubuntu7

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


** Tags: amd64 apport-bug compiz-0.9 latest-bios-1.44 trusty ubuntu
-- 
Connected 2nd display, bugged out
https://bugs.launchpad.net/bugs/1301756
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