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Hi,
I run Ubuntu 18.04 on a Dell Precision 7540. Most of the time I use
this through a Dell WD19DC dock. The dock is connected to a Trendnet
TK-240DP KVM Switch.
If I have the laptop clamshell closed, like I normally do, and switch my
KVM to the other computer, and then switch back, my monitors stay enter
power saving mode. Most of the time, I am able to recover the screens
by pressing Control-Alt-F3, waiting a few seconds, and then pressing
Control-Alt-F2. The problem does not happen if the clamshell is left
open. Part of the problem is that this is a cheaper KVM, and from the
laptop's perspective the screens are disconnected when the computer is
switched.
Changing a few small things makes the problem not occur:
* Opening the clamshell when switching the KVM. Interestingly, if the
clamshell is open during either the switch away OR the switch back, the screen
recovers.
* Manually removing the displays one at a time does not reliably trigger the
problem. Though I have witnessed the problem occur once or twice when removing
a single display.
I am attaching three nvidia bug report logs:
1. nvidia-bug-report-before.log.gz is after a clean boot when I have not used
the KVM.
2. nvidia-bug-report-blank.log.gz is after switching the KVM to the other
computer and back. During this time, both screens are black. The log was
taken over ssh.
3. nvidia-bug-report-workaround.log.gz is after I have recovered the screen
after using Ctrl-Alt-F3 followed by Ctrl-Alt-F2.
This problem happens when prime-select is set to intel or nvidia. These
logs are when it was set to intel.
Any advice would be greatly appreciated.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
Uname: Linux 5.5.0-050500rc6-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: Unity:Unity7:ubuntu
Date: Fri Apr 17 13:57:43 2020
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus:
nvidia, 440.82, 4.15.0-1079-oem, x86_64: installed
nvidia, 440.82, 5.0.0-1047-oem-osp1, x86_64: installed
nvidia, 440.82, 5.5.0-050500rc6-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation Device [8086:3e9b] (rev 02) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:0926]
NVIDIA Corporation Device [10de:1f36] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:0926]
InstallationDate: Installed on 2020-01-03 (104 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
MachineType: Dell Inc. Precision 7540
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.5.0-050500rc6-generic
root=UUID=7f01cb01-e7df-4259-9d7a-ae37a19f363b ro quiet splash dis_ucode_ldr
vt.handoff=1
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/12/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.8.2
dmi.board.name: 0499T7
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.8.2:bd03/12/2020:svnDellInc.:pnPrecision7540:pvr:rvnDellInc.:rn0499T7:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 7540
dmi.product.sku: 0926
dmi.sys.vendor: Dell Inc.
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 19.2.8-0ubuntu0~18.04.3
version.libgl1-mesa-glx: libgl1-mesa-glx 19.2.8-0ubuntu0~18.04.3
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: amd64 apport-bug bionic false-gpu-hang freeze third-party-packages
ubuntu
--
Blank screen when KVM switching via a Dell WD19DC dock
https://bugs.launchpad.net/bugs/1873510
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