Public bug reported:
Since recently, my external monitor goes black in random intervals of
5-10 min.
I have Dell monitor connected via display port to a Lenovo ThinkPad
T510. I always switch off the laptop screen with "xrandr -q --output
LVDS-1 --off" and work only with the external monitor. This combination
worked flawlessly for the last six month.
Since a couple of days, the laptop suddenly stops sending a signal to
the external monitor, which goes black. The signal is send again, after
replugging the display port cable or repowering the monitor. The problem
does not seem to occur when I do not switch off the laptop monitor and
work on two screens in parallel.
At first I thought it was a problem of the monitor, but it seems to be a
bug in the graphics driver:
[29042.368884] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[29042.368948] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH
transcoder B FIFO underrun
[29049.759513] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH
transcoder B FIFO underrun
[29050.354467] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to get
link status
[29050.441402] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization
[29050.526209] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH
transcoder B FIFO underrun
Note, over the last years I frequently (say at least on a weekly basis)
observed that the external monitor goes black for the flash of a second
but then instantly recovers. This happened with combinations of
different laptops and screens. I thought so far this was related to
fluctuations in the power supply, but maybe there is something more
sinister at hand.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xserver-xorg-video-intel 2:2.99.917+git20171229-1
ProcVersionSignature: Ubuntu 4.10.0-42.46-generic 4.10.17
Uname: Linux 4.10.0-42-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.9-0ubuntu7.10
Architecture: amd64
CompizPlugins:
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: None
CurrentDesktop: GNOME
Date: Fri Feb 28 10:36:40 2020
DistUpgraded: 2018-05-24 16:40:32,746 DEBUG failed to SystemUnLock() (E:Not
locked)
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation Core Processor Integrated Graphics Controller [8086:0046]
(rev 02) (prog-if 00 [VGA controller])
Subsystem: Lenovo Core Processor Integrated Graphics Controller [17aa:215a]
InstallationDate: Installed on 2015-11-05 (1575 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: LENOVO 4384WRP
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-42-generic
root=UUID=3949412b-a319-496c-8e0a-8b24db59326e ro uveau.modeset=0
acpi_enforce_resources=lax nosplash uveau.modeset=0 acpi_enforce_resources=lax
acpi_enforce_resources=lax acpi_enforce_resources=lax
acpi_enforce_resources=lax acpi_enforce_resources=lax acpi_enforce_resources=lax
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to bionic on 2018-05-24 (644 days ago)
dmi.bios.date: 09/26/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 6MET92WW (1.52 )
dmi.board.name: 4384WRP
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr6MET92WW(1.52):bd09/26/2012:svnLENOVO:pn4384WRP:pvrThinkPadT510:rvnLENOVO:rn4384WRP:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4384WRP
dmi.product.version: ThinkPad T510
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.99-1ubuntu1~18.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.8-0ubuntu0~18.04.2
version.libgl1-mesa-glx: libgl1-mesa-glx 19.2.8-0ubuntu0~18.04.2
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Thu Feb 27 09:46:06 2020
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.6-1ubuntu4.4
xserver.video_driver: modeset
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic possible-manual-nvidia-install ubuntu
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https://bugs.launchpad.net/bugs/1865101
Title:
No signal to external monitor after
[drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH
transcoder B FIFO underrun
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