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[Germán Poo-Caamaño <gpoo@xxxxxxxxxxxx>]

I set it back to Confirmed as this bug mainly is a crash report, with a
kernel stacktrace. The stacktrace may help a developer to see where the
issue is.

The other bug is only about the garbage text, something I mentioned that
may be related, but it may be not and just be coincidence.

Anyhow, I will test the setting suggested there (to fallback from SNA to
UXA), and see  whether I can get a crash report in the following days.
Otherwise, I will try back to SNA and test the same again.

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1511002

Title:
  Computer freezes/crashes while using GNOME

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  I think I have two issues (may related) with the Intel driver for my
  graphic card. Sometimes the text is shown as garbage, and every other
  day (after suspending) it crashes.  As I have not figure out what is
  the SysRq magic key is in this new laptop (Lenovo x250), I can only
  recover control on my computer after pressing the power off button.

  I cannot go to a vt. No nothing.  I hope the follow call trace is
  related to that, although it should not be there in any case :-)

  
  Oct 27 14:49:33 sai kernel: [38682.963345] ------------[ cut here ]------------
  Oct 27 14:49:33 sai kernel: [38682.963368] WARNING: CPU: 0 PID: 0 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:11100 intel_check_page_flip+0xfc/0x110 [i915]()
  Oct 27 14:49:33 sai kernel: [38682.963369] Kicking stuck page flip: queued at 2122948, now 2122952
  Oct 27 14:49:33 sai kernel: [38682.963370] Modules linked in: ses enclosure uas usb_storage hid_generic usbhid hid msr rfcomm pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) drbg ansi_cprng ctr ccm binfmt_misc bnep arc4 int
  el_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core crct10dif_pclmul v4l2_common videodev crc32_pclmul iwlmvm snd_hda_codec_hdmi snd_hda_codec_realtek bt
  usb media snd_hda_codec_generic ghash_clmulni_intel btrtl mac80211 btbcm btintel bluetooth aesni_intel snd_hda_intel aes_x86_64 snd_hda_codec lrw gf128mul snd_hda_core glue_helper snd_hwdep ablk_helper thinkpad_acpi cryptd iwlwifi snd_pcm
   nvram snd_seq_midi snd_seq_midi_event snd_rawmidi input_leds cfg80211 joydev snd_seq serio_raw rtsx_pci_ms snd_seq_device memstick snd_timer snd mei_me soundcore shpchp mei lpc_ich mac_hid parport_pc ppdev sunrpc lp parport autofs4 rtsx_
  pci_sdmmc i915 psmouse i2c_algo_bit e1000e drm_kms_helper ahci libahci drm ptp rtsx_pci pps_core wmi video
  Oct 27 14:49:33 sai kernel: [38682.963414] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W  OE   4.2.0-16-generic #19-Ubuntu
  Oct 27 14:49:33 sai kernel: [38682.963415] Hardware name: LENOVO 20CMCTO1WW/20CMCTO1WW, BIOS N10ET36W (1.15 ) 06/19/2015
  Oct 27 14:49:33 sai kernel: [38682.963416]  0000000000000000 4c472c3169d69ebc ffff88022dc03d48 ffffffff817e8c09
  Oct 27 14:49:33 sai kernel: [38682.963418]  0000000000000000 ffff88022dc03da0 ffff88022dc03d88 ffffffff8107b3c6
  Oct 27 14:49:33 sai kernel: [38682.963420]  ffff88022dc03db8 ffff8800b872d000 ffff8802201e2000 ffff8800b872d1a8
  Oct 27 14:49:33 sai kernel: [38682.963421] Call Trace:
  Oct 27 14:49:33 sai kernel: [38682.963422]  <IRQ>  [<ffffffff817e8c09>] dump_stack+0x45/0x57
  Oct 27 14:49:33 sai kernel: [38682.963429]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
  Oct 27 14:49:33 sai kernel: [38682.963431]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
  Oct 27 14:49:33 sai kernel: [38682.963443]  [<ffffffffc01fdb3c>] intel_check_page_flip+0xfc/0x110 [i915]
  Oct 27 14:49:33 sai kernel: [38682.963453]  [<ffffffffc01c65e5>] gen8_irq_handler+0x325/0x590 [i915]
  Oct 27 14:49:33 sai kernel: [38682.963456]  [<ffffffff810d41d4>] handle_irq_event_percpu+0x74/0x180
  Oct 27 14:49:33 sai kernel: [38682.963457]  [<ffffffff810d4329>] handle_irq_event+0x49/0x70
  Oct 27 14:49:33 sai kernel: [38682.963459]  [<ffffffff810d76a1>] handle_edge_irq+0x81/0x150
  Oct 27 14:49:33 sai kernel: [38682.963461]  [<ffffffff81017295>] handle_irq+0x25/0x40
  Oct 27 14:49:33 sai kernel: [38682.963463]  [<ffffffff817f25ef>] do_IRQ+0x4f/0xe0
  Oct 27 14:49:33 sai kernel: [38682.963465]  [<ffffffff817f056b>] common_interrupt+0x6b/0x6b
  Oct 27 14:49:33 sai kernel: [38682.963465]  <EOI>  [<ffffffff810e77a4>] ? enqueue_hrtimer+0x44/0x80
  Oct 27 14:49:33 sai kernel: [38682.963469]  [<ffffffff81686930>] ? cpuidle_enter_state+0x130/0x270
  Oct 27 14:49:33 sai kernel: [38682.963471]  [<ffffffff8168690b>] ? cpuidle_enter_state+0x10b/0x270
  Oct 27 14:49:33 sai kernel: [38682.963472]  [<ffffffff81686aa7>] cpuidle_enter+0x17/0x20
  Oct 27 14:49:33 sai kernel: [38682.963474]  [<ffffffff810bd432>] call_cpuidle+0x32/0x60
  Oct 27 14:49:33 sai kernel: [38682.963475]  [<ffffffff81686a83>] ? cpuidle_select+0x13/0x20
  Oct 27 14:49:33 sai kernel: [38682.963476]  [<ffffffff810bd6c8>] cpu_startup_entry+0x268/0x320
  Oct 27 14:49:33 sai kernel: [38682.963479]  [<ffffffff817dd16c>] rest_init+0x7c/0x80
  Oct 27 14:49:33 sai kernel: [38682.963481]  [<ffffffff81d50025>] start_kernel+0x48b/0x4ac
  Oct 27 14:49:33 sai kernel: [38682.963483]  [<ffffffff81d4f120>] ? early_idt_handler_array+0x120/0x120
  Oct 27 14:49:33 sai kernel: [38682.963484]  [<ffffffff81d4f339>] x86_64_start_reservations+0x2a/0x2c
  Oct 27 14:49:33 sai kernel: [38682.963486]  [<ffffffff81d4f485>] x86_64_start_kernel+0x14a/0x16d
  Oct 27 14:49:33 sai kernel: [38682.963487] ---[ end trace 2d9bf7218712045a ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  gpoo       2278 F.... pulseaudio
   /dev/snd/controlC0:  gpoo       2278 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed Oct 28 08:52:31 2015
  InstallationDate: Installed on 2015-04-07 (203 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Beta amd64 (20150326)
  MachineType: LENOVO 20CMCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=6d7b32fc-b6c2-4bd8-8a58-fe1941d338b1 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-22 (5 days ago)
  dmi.bios.date: 06/19/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N10ET36W (1.15 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CMCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN10ET36W(1.15):bd06/19/2015:svnLENOVO:pn20CMCTO1WW:pvrThinkPadX250:rvnLENOVO:rn20CMCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20CMCTO1WW
  dmi.product.version: ThinkPad X250
  dmi.sys.vendor: LENOVO

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