Secondary monitor enters power save mode for no apparent reason

[Ian Smith]

My secondary monitor has a tendency to enter power save mode for no apparent reason while my laptop is in use; unplugging and replugging my dock from the laptop seems to bring it back but sometimes requires a few tries. Doesn't seem to be any of:
- after a predictable period of time
- after inactivity

Laptop: Dell XPS 13 9300, running Focal
Dock: Dell WD19TB. Recently updated; current dock version per fwupdmgr is 01.00.00.04; thunderbolt controller is 43.00; MST controller VMM5331 is 05.04.03

Monitor: Dell P2715Q

Not sure what logs would be useful, but happy to gather those as requested.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: ismith 3753 F.... pulseaudio
 /dev/snd/controlC1: ismith 3753 F.... pulseaudio
 /dev/snd/controlC0: ismith 3753 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-08-09 (184 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 13 9300
Package: linux (not installed)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-41-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-41.46~20.04.1-generic 5.8.18
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-41-generic N/A
 linux-backports-modules-5.8.0-41-generic N/A
 linux-firmware 1.187.9
Tags: focal
Uname: Linux 5.8.0-41-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 01/17/2020
dmi.bios.release: 1.0
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.0.6
dmi.board.name: 0WX9VX
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.0.6:bd01/17/2020:br1.0:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn0WX9VX:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9300
dmi.product.sku: 096D
dmi.sys.vendor: Dell Inc.

[Ian Smith (ismith-mit)]

Kernel: 5.8.0-41-generic

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1915188

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Mario Limonciello (superm1)]

I would suggest that you install linux-oem-5.10 (https://launchpad.net/ubuntu/+source/linux-oem-5.10) and see if this persists. This is the kernel shipping with the "newer" models and has an updated graphics driver.

[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

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[Ian Smith (ismith-mit)]

> #3
I would suggest that you install linux-oem-5.10 (https://launchpad.net/ubuntu/+source/linux-oem-5.10) and see if this persists. This is the kernel shipping with the "newer" models and has an updated graphics driver.

Will try this, thanks.