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[carlos palma <1535879@xxxxxxxxxxxxxxxxxx>]

It looks like upstream kernel doesn't solve completely the problem:

uname -a
Linux carlosLT 4.4.0-040400-generic #201601101930 SMP Mon Jan 11 00:32:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

However, it does no hangs anymore when I switch nouveau<->nvidia
(355.11). No need to restart.

This bug can also be followed at:
https://bugs.freedesktop.org/show_bug.cgi?id=89806

Carlos


** Bug watch added: freedesktop.org Bugzilla #89806
   https://bugs.freedesktop.org/show_bug.cgi?id=89806

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https://bugs.launchpad.net/bugs/1535879

Title:
  It looks to be the (expired ) bug #1451632 drm:intel fifo

Status in xorg package in Ubuntu:
  New

Bug description:
  https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1451632/+activity
  dmesg | grep drm:intel

  [    1.441536] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
  [    1.441575] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

  Returned back (https://bugzilla.kernel.org/show_bug.cgi?id=79261). It
  seamed to be fixed up-stream but not for all.

  Effects on my DELL Precision E6530: without notice it switches from
  nouveau to nvidia. Switching back to nouveau it hangs (need restart)
  and OK.

  Using optimus: 
  00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
  01:00.0 VGA compatible controller: NVIDIA Corporation GF108GLM [NVS 5200M] (rev ff)

  I'll try to use the upstream kernels and inform ...

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
  Uname: Linux 4.2.0-25-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu5
  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: Tue Jan 19 20:32:03 2016
  DistUpgraded: 2015-10-12 20:30:48,655 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0535]
   NVIDIA Corporation GF108GLM [NVS 5200M] [10de:0dfc] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2014-05-19 (610 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E6530
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-25-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash
  SourcePackage: xorg
  UpgradeStatus: Upgraded to wily on 2015-10-12 (99 days ago)
  dmi.bios.date: 12/13/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 07Y85M
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd12/13/2012:svnDellInc.:pnLatitudeE6530:pvr01:rvnDellInc.:rn07Y85M:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6530
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Tue Jan 19 18:32:11 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5553 
   vendor                                     CMN
  xserver.version: 2:1.17.2-1ubuntu9.1

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