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[caljorden <caljorden@xxxxxxxxxxx>]

Same problem here with Asus X305 laptop (Intel Core M-5Y10c CPU)

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https://bugs.launchpad.net/bugs/1449401

Title:
  After 14.10 updates to kernel 3.16.0-36, system is not booting,
  resulting in black screen due to NULL pointer in intel_ring_init_seqno

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Utopic:
  In Progress

Bug description:
  This happens everytime I boot after updating kernel from 3.16.0-34 to
  3.16.0-36. Keeping 3.16.0-34 still works.

  Blackscreen is illuminated. I do not see any splash screen, nor X.
  Failsafe mode works, booting with "nomodeset" works (but it's slow).
  When this happens, on the next reboot I do see some "BUG:" lines in
  syslog, like:

  Apr 27 21:01:54 portable-alex kernel: [    2.457904] BUG: unable to handle kernel NULL pointer dereference at           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.457911] IP: [<          (null)>]           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.457913] PGD 51b93d067 PUD 51b8ec067 PMD 0 
  Apr 27 21:01:54 portable-alex kernel: [    2.457916] Oops: 0010 [#1] SMP 
  Apr 27 21:01:54 portable-alex kernel: [    2.457918] Modules linked in: rtsx_pci_sdmmc i915(+) e1000e ahci ptp i2c_algo_bit drm_kms_helper libahci pps_core psmouse drm rtsx_pci wmi video
  Apr 27 21:01:54 portable-alex kernel: [    2.457926] CPU: 0 PID: 128 Comm: systemd-udevd Not tainted 3.16.0-36-generic #48-Ubuntu
  Apr 27 21:01:54 portable-alex kernel: [    2.457929] Hardware name: LENOVO 20BXCTO1WW/20BXCTO1WW, BIOS JBET45WW (1.10 ) 02/03/2015
  Apr 27 21:01:54 portable-alex kernel: [    2.457930] task: ffff88051be6bd20 ti: ffff88051b9a8000 task.ti: ffff88051b9a8000
  Apr 27 21:01:54 portable-alex kernel: [    2.457932] RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.457934] RSP: 0018:ffff88051b9ab890  EFLAGS: 00010286
  Apr 27 21:01:54 portable-alex kernel: [    2.457936] RAX: 0000000000000246 RBX: ffff88051bbb1928 RCX: 0000000000000001
  Apr 27 21:01:54 portable-alex kernel: [    2.457937] RDX: 0000000000000001 RSI: 00000000ffffeffe RDI: ffff88051bbb1928
  Apr 27 21:01:54 portable-alex kernel: [    2.457938] RBP: ffff88051b9ab8b0 R08: ffff88051bbb0000 R09: 0000000000000246
  Apr 27 21:01:54 portable-alex kernel: [    2.457940] R10: ffff880529403900 R11: ffffffff811a6ddf R12: 00000000ffffeffe
  Apr 27 21:01:54 portable-alex kernel: [    2.457941] R13: ffff88051bbb0000 R14: 00000000ffffeffe R15: ffff88051bf90800
  Apr 27 21:01:54 portable-alex kernel: [    2.457942] FS:  00007f8127b4f880(0000) GS:ffff88053dc00000(0000) knlGS:0000000000000000
  Apr 27 21:01:54 portable-alex kernel: [    2.457944] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Apr 27 21:01:54 portable-alex kernel: [    2.457945] CR2: 0000000000000000 CR3: 000000051b942000 CR4: 00000000003407f0
  Apr 27 21:01:54 portable-alex kernel: [    2.457947] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  Apr 27 21:01:54 portable-alex kernel: [    2.457948] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Apr 27 21:01:54 portable-alex kernel: [    2.457949] Stack:
  Apr 27 21:01:54 portable-alex kernel: [    2.457950]  ffffffffc02499fd ffff88051bbb1928 ffff88051bbb7148 ffff88051bbb7148
  Apr 27 21:01:54 portable-alex kernel: [    2.457953]  ffff88051b9ab8e8 ffffffffc022e5b7 00000000ffffefff 00000000ffffeffe
  Apr 27 21:01:54 portable-alex kernel: [    2.457955]  ffff88051bbb0000 ffff88051bbb0000 ffff88051bbb0000 ffff88051b9ab910
  Apr 27 21:01:54 portable-alex kernel: [    2.457957] Call Trace:
  Apr 27 21:01:54 portable-alex kernel: [    2.457977]  [<ffffffffc02499fd>] ? intel_ring_init_seqno+0x3d/0xb0 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.457991]  [<ffffffffc022e5b7>] i915_gem_init_seqno+0x77/0xc0 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458002]  [<ffffffffc022e629>] i915_gem_set_seqno+0x29/0x60 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458013]  [<ffffffffc022fdcd>] i915_gem_init_hw+0x12d/0x380 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458022]  [<ffffffffc0230075>] i915_gem_init+0x55/0x1d0 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458039]  [<ffffffffc02956a2>] i915_driver_load+0xe32/0x1030 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458042]  [<ffffffff813a05e8>] ? kobject_uevent_env+0x178/0x690
  Apr 27 21:01:54 portable-alex kernel: [    2.458046]  [<ffffffff814cf087>] ? get_device+0x17/0x30
  Apr 27 21:01:54 portable-alex kernel: [    2.458048]  [<ffffffff814d4af5>] ? klist_class_dev_get+0x15/0x20
  Apr 27 21:01:54 portable-alex kernel: [    2.458051]  [<ffffffff817773b8>] ? klist_node_init+0x38/0x60
  Apr 27 21:01:54 portable-alex kernel: [    2.458054]  [<ffffffff81777476>] ? klist_add_tail+0x46/0x50
  Apr 27 21:01:54 portable-alex kernel: [    2.458056]  [<ffffffff814d089b>] ? device_add+0x1db/0x6d0
  Apr 27 21:01:54 portable-alex kernel: [    2.458066]  [<ffffffffc012f4f6>] ? drm_sysfs_device_add+0xd6/0x120 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458072]  [<ffffffffc012b9dd>] drm_dev_register+0xad/0x100 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458078]  [<ffffffffc012e5cd>] drm_get_pci_dev+0x8d/0x200 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458088]  [<ffffffffc020b4bb>] i915_pci_probe+0x3b/0x60 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458091]  [<ffffffff813e6d15>] local_pci_probe+0x45/0xa0
  Apr 27 21:01:54 portable-alex kernel: [    2.458093]  [<ffffffff813e7ff5>] ? pci_match_device+0xe5/0x110
  Apr 27 21:01:54 portable-alex kernel: [    2.458096]  [<ffffffff813e8139>] pci_device_probe+0xd9/0x130
  Apr 27 21:01:54 portable-alex kernel: [    2.458098]  [<ffffffff814d3bd3>] driver_probe_device+0xa3/0x410
  Apr 27 21:01:54 portable-alex kernel: [    2.458100]  [<ffffffff814d400b>] __driver_attach+0x8b/0x90
  Apr 27 21:01:54 portable-alex kernel: [    2.458101]  [<ffffffff814d3f80>] ? __device_attach+0x40/0x40
  Apr 27 21:01:54 portable-alex kernel: [    2.458104]  [<ffffffff814d1a4b>] bus_for_each_dev+0x6b/0xb0
  Apr 27 21:01:54 portable-alex kernel: [    2.458106]  [<ffffffff814d365e>] driver_attach+0x1e/0x20
  Apr 27 21:01:54 portable-alex kernel: [    2.458107]  [<ffffffff814d3260>] bus_add_driver+0x180/0x250
  Apr 27 21:01:54 portable-alex kernel: [    2.458109]  [<ffffffff814d47e4>] driver_register+0x64/0xf0
  Apr 27 21:01:54 portable-alex kernel: [    2.458112]  [<ffffffff813e658c>] __pci_register_driver+0x4c/0x50
  Apr 27 21:01:54 portable-alex kernel: [    2.458117]  [<ffffffffc012e84a>] drm_pci_init+0x10a/0x140 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458119]  [<ffffffffc02ed000>] ? 0xffffffffc02ecfff
  Apr 27 21:01:54 portable-alex kernel: [    2.458129]  [<ffffffffc02ed089>] i915_init+0x89/0x90 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458132]  [<ffffffff81002148>] do_one_initcall+0xd8/0x210
  Apr 27 21:01:54 portable-alex kernel: [    2.458135]  [<ffffffff811a8902>] ? __vunmap+0xa2/0x100
  Apr 27 21:01:54 portable-alex kernel: [    2.458138]  [<ffffffff810f39f8>] load_module+0x14b8/0x1b60
  Apr 27 21:01:54 portable-alex kernel: [    2.458140]  [<ffffffff810ef370>] ? store_uevent+0x40/0x40
  Apr 27 21:01:54 portable-alex kernel: [    2.458143]  [<ffffffff811e77b8>] ? kernel_read+0x48/0x60
  Apr 27 21:01:54 portable-alex kernel: [    2.458145]  [<ffffffff810f4216>] SyS_finit_module+0x86/0xb0
  Apr 27 21:01:54 portable-alex kernel: [    2.458149]  [<ffffffff8178c98d>] system_call_fastpath+0x1a/0x1f
  Apr 27 21:01:54 portable-alex kernel: [    2.458150] Code:  Bad RIP value.
  Apr 27 21:01:54 portable-alex kernel: [    2.458153] RIP  [<          (null)>]           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.458154]  RSP <ffff88051b9ab890>
  Apr 27 21:01:54 portable-alex kernel: [    2.458155] CR2: 0000000000000000
  Apr 27 21:01:54 portable-alex kernel: [    2.458157] ---[ end trace e531fde427227413 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-36-generic 3.16.0-36.48
  ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
  Uname: Linux 3.16.0-34-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  alex       3165 F.... pulseaudio
   /dev/snd/controlC0:  alex       3165 F.... pulseaudio
  Date: Tue Apr 28 09:20:10 2015
  HibernationDevice: RESUME=UUID=3013558c-f831-45dd-8df1-9446a8f310c5
  InstallationDate: Installed on 2012-11-03 (905 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 20BXCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-34-generic root=UUID=fb606209-63f0-4ff0-a524-a7cba117cdc3 ro quiet splash nomdmonddf nomdmonisw
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-34-generic N/A
   linux-backports-modules-3.16.0-34-generic  N/A
   linux-firmware                             1.138.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2015-03-07 (51 days ago)
  dmi.bios.date: 02/03/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET45WW (1.10 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET45WW(1.10):bd02/03/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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