Dell 5530: Trackpad, wifi and thunderbolt screen stop working after upgrade from kernel v5.4 to v5.8

[Shaun Crampton]

After installing the v5.8 kernel, my laptop becomes unusable with multiple issues:

* Trackpad stops working
* External screen connected over USB-C stops working
* Wifi stops working

I collected the apport report to file and then rebooted in v5.4 to send it. On v5.4 this laptop is pretty stable with all three of the above working reliably.

Interestingly, the USB hub itself in the monitor works fine because I can use the keyboard through the monitor. It's only the graphics that stops working. Screen stays off when I plug it in.

I also noticed that the laptop screen runs in a different resolution rather than the one I selected while v5.4 was installed. I run the screen at half-res to match the DPI of my external screen but it booted in full res so everything was tiny.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-40-generic 5.8.0-40.45~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-40.45~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 22 20:50:57 2021
InstallationDate: Installed on 2018-12-11 (773 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: Upgraded to focal on 2020-05-02 (265 days ago)
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2020-10-15T09:26:41.949637

[Shaun Crampton (fasaxc)]

Tried upgrading firmware to latest 1.18.1 but see the same issues.

[Shaun Crampton (fasaxc)]

Just booted into 5.8.0-48-generic and it seems to be working :-)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.