Secondary monitor blanks out randomly

[nemith]

When hooked up to a second monitor it will blank out occastionally. Same issue on two external monitors. Both hooked up via MiniDisplay port.

Every time it happens i have a the following log in my dmesg:

[47192.964713] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-generic 4.8.0.26.35
ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
Uname: Linux 4.8.0-26-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: bbennett 2693 F.... pulseaudio
 /dev/snd/controlC1: bbennett 2693 F.... pulseaudio
 /dev/snd/controlC0: bbennett 2693 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Oct 27 16:03:21 2016
HibernationDevice: RESUME=UUID=872ed834-8bdc-4c58-a9ab-6c0ad9ec3ca8
InstallationDate: Installed on 2016-10-17 (10 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
MachineType: LENOVO 20FRS0XT00
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-26-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.8.0-26-generic N/A
 linux-backports-modules-4.8.0-26-generic N/A
 linux-firmware 1.161
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/30/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: N1FET38W (1.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FRS0XT00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1FET38W(1.12):bd03/30/2016:svnLENOVO:pn20FRS0XT00:pvrThinkPadX1Carbon4th:rvnLENOVO:rn20FRS0XT00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20FRS0XT00
dmi.product.version: ThinkPad X1 Carbon 4th
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.9 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc2

[nemith (bennetb)]

4.9-rc2 doesn't bring up my external monitor at all so I couldn't do further testing.