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[Launchpad Bug Tracker <1535879@xxxxxxxxxxxxxxxxxx>]

You have been subscribed to a public bug:

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

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


** Tags: amd64 apport-bug bios-outdated-a17 compiz-0.9 third-party-packages ubuntu wily
-- 
It looks to be the (expired ) bug #1451632 drm:intel fifo
https://bugs.launchpad.net/bugs/1535879
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