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[Romain <1448419@xxxxxxxxxxxxxxxxxx>]

Interesting:
removing the xserver-xorg-video-intel does not resolve the issue.
I guess this might be linux-related then

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https://bugs.launchpad.net/bugs/1448419

Title:
  Computer going to sleep mode after a few minutes

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

Bug description:
  After a few minutes, the computer is going to sleep mode.

  Switching to a console (Ctrl - Alt - F1) shows two error messages —
  might be typos since I a copying from a picture:

  [drm:i9xx_check_fifo_underrun] <ERROR> pipe A underrun
  [drm:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq 0).

  A crash can also be found in /var/log/kern.log:

  Apr 25 10:56:11 tolkien kernel: [  246.377401] ------------[ cut here ]------------
  Apr 25 10:56:11 tolkien kernel: [  246.377443] WARNING: CPU: 0 PID: 1520 at /build/buildd/linux-3.19.0/drivers/gpu/drm/drm_irq.c:112
  1 drm_wait_one_vblank+0x170/0x180 [drm]()
  Apr 25 10:56:11 tolkien kernel: [  246.377447] vblank not available on crtc 1, ret=-22
  Apr 25 10:56:11 tolkien kernel: [  246.377449] Modules linked in: coretemp kvm_intel kvm joydev arc4 serio_raw ath9k ath9k_common at
  h9k_hw ath snd_hda_codec_hdmi mac80211 snd_hda_codec_realtek snd_hda_codec_generic lpc_ich snd_hda_intel rfcomm bnep cfg80211 snd_hd
  a_controller snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd shpchp
   soundcore bluetooth parport_pc ppdev lp mac_hid parport xts gf128mul dm_crypt i915 ahci psmouse i2c_algo_bit libahci drm_kms_helper
   r8169 drm mii video
  Apr 25 10:56:11 tolkien kernel: [  246.377507] CPU: 0 PID: 1520 Comm: systemd-logind Tainted: G        W      3.19.0-15-generic #15-
  Ubuntu
  Apr 25 10:56:11 tolkien kernel: [  246.377511] Hardware name: LENGDA Montevina platform/Montevina platform, BIOS 4.6.3 07/08/2011
  Apr 25 10:56:11 tolkien kernel: [  246.377514]  ffffffffc0261e18 ffff88006ff638c8 ffffffff817c2205 0000000000000007
  Apr 25 10:56:11 tolkien kernel: [  246.377519]  ffff88006ff63918 ffff88006ff63908 ffffffff8107595a ffff88006ff63968
  Apr 25 10:56:11 tolkien kernel: [  246.377525]  ffff880035580000 ffff880035d97000 0000000000000001 ffff880035580000
  Apr 25 10:56:11 tolkien kernel: [  246.377530] Call Trace:
  Apr 25 10:56:11 tolkien kernel: [  246.377543]  [<ffffffff817c2205>] dump_stack+0x45/0x57
  Apr 25 10:56:11 tolkien kernel: [  246.377549]  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
  Apr 25 10:56:11 tolkien kernel: [  246.377554]  [<ffffffff810759d6>] warn_slowpath_fmt+0x46/0x50
  Apr 25 10:56:11 tolkien kernel: [  246.377573]  [<ffffffffc0233ee0>] drm_wait_one_vblank+0x170/0x180 [drm]
  Apr 25 10:56:11 tolkien kernel: [  246.377615]  [<ffffffffc03ce4bf>] ? gen4_read32+0x4f/0xc0 [i915]
  Apr 25 10:56:11 tolkien kernel: [  246.377656]  [<ffffffffc0420965>] intel_enable_tv+0x25/0x60 [i915]
  Apr 25 10:56:11 tolkien kernel: [  246.377692]  [<ffffffffc03ebfeb>] i9xx_crtc_enable+0x3fb/0x4c0 [i915]
  Apr 25 10:56:11 tolkien kernel: [  246.377727]  [<ffffffffc03ea592>] __intel_set_mode+0x882/0xc80 [i915]
  Apr 25 10:56:11 tolkien kernel: [  246.377764]  [<ffffffffc03f01cd>] intel_set_mode+0x6d/0x90 [i915]
  Apr 25 10:56:11 tolkien kernel: [  246.377800]  [<ffffffffc03f0425>] intel_get_load_detect_pipe+0x235/0x460 [i915]
  Apr 25 10:56:11 tolkien kernel: [  246.377807]  [<ffffffff8126d51e>] ? kernfs_fop_open+0x22e/0x420
  Apr 25 10:56:11 tolkien kernel: [  246.377846]  [<ffffffffc0421565>] intel_tv_detect+0x135/0x670 [i915]
  Apr 25 10:56:11 tolkien kernel: [  246.377851]  [<ffffffff8126d680>] ? kernfs_fop_open+0x390/0x420
  Apr 25 10:56:11 tolkien kernel: [  246.377874]  [<ffffffffc0239141>] status_show+0x41/0x90 [drm]
  Apr 25 10:56:11 tolkien kernel: [  246.377883]  [<ffffffff81501be0>] dev_attr_show+0x20/0x60
  Apr 25 10:56:11 tolkien kernel: [  246.377889]  [<ffffffff817c6e56>] ? mutex_lock+0x16/0x40
  Apr 25 10:56:11 tolkien kernel: [  246.377894]  [<ffffffff8126dfe6>] sysfs_kf_seq_show+0xb6/0x150
  Apr 25 10:56:11 tolkien kernel: [  246.377899]  [<ffffffff8126c5a3>] kernfs_seq_show+0x23/0x30
  Apr 25 10:56:11 tolkien kernel: [  246.377905]  [<ffffffff812184cd>] seq_read+0xcd/0x3b0
  Apr 25 10:56:11 tolkien kernel: [  246.377910]  [<ffffffff8126cf35>] kernfs_fop_read+0x105/0x170
  Apr 25 10:56:11 tolkien kernel: [  246.377916]  [<ffffffff813129b4>] ? security_file_permission+0x84/0xa0
  Apr 25 10:56:11 tolkien kernel: [  246.377922]  [<ffffffff811f3df8>] __vfs_read+0x18/0x50
  Apr 25 10:56:11 tolkien kernel: [  246.377927]  [<ffffffff811f3eba>] vfs_read+0x8a/0x140
  Apr 25 10:56:11 tolkien kernel: [  246.377931]  [<ffffffff811f3fb6>] SyS_read+0x46/0xb0
  Apr 25 10:56:11 tolkien kernel: [  246.377938]  [<ffffffff817c934d>] system_call_fastpath+0x16/0x1b
  Apr 25 10:56:11 tolkien kernel: [  246.377942] ---[ end trace 816c557919d1cbca ]---

  It seems this crash is reported, but I do not know if it is a red herring:
  https://lkml.org/lkml/2015/3/1/6

  Booting on kernel 3.16.0-34 does not resolve the issue, nor does using
  upstart.

  I will be bisecting the driver today to see if I can add more
  information

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Sat Apr 25 11:05:44 2015
  DistUpgraded: 2015-04-23 21:43:24,830 DEBUG enabling apt cron job
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
     Subsystem: Device [1b50:5608]
     Subsystem: Device [1b50:5608]
  InstallationDate: Installed on 2015-04-11 (13 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENGDA Montevina platform
  ProcEnviron:
   LANGUAGE=en_IE:en
   TERM=linux
   PATH=(custom, no user)
   LANG=en_IE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=/dev/mapper/ubuntu--vg-root ro recovery nomodeset
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to vivid on 2015-04-23 (1 days ago)
  dmi.bios.date: 07/08/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.3
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Montevina platform
  dmi.board.vendor: LENGDA
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENGDA
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.3:bd07/08/2011:svnLENGDA:pnMontevinaplatform:pvrTobefilledbyO.E.M.:rvnLENGDA:rnMontevinaplatform:rvrTobefilledbyO.E.M.:cvnLENGDA:ct10:cvrToBeFilledByO.E.M.:
  dmi.product.name: Montevina platform
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: LENGDA
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Sat Apr 25 11:02:09 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.1-0ubuntu3

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