It kind if sounds like the system is in partial sleep mode, or trying to
get there. And that would make sense because when the bug occurs the lid
is closed and you've disconnected the only other screen. So you're kind
of asking for screen hotplugging (or switching back to it on the KVM) to
wake the system. When you put it that way it's kind of not a bug, if the
theory is right...
Can you please run 'gnome-tweaks' and check that:
Gnome Tweaks > Power > Suspend when laptop lid is closed = OFF
?
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1873510
Title:
Blank screen when hotplugging monitors connected through DisplayPort
dock
Status in Ubuntu:
Incomplete
Bug description:
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
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