Mangled environment after the monitor turns back on

[adder46]

Problem Description

I have an issue that has been bugging me since I bought this computer: I can't let it switch off the display after n minutes, because the HDMI signal gets lost and the monitor turns off, only to turn on again after a couple of seconds (without me touching the mouse or the keyboard). Once turned on, I arrive to a f*cked up [XMonad] environment:

   - I can only see the desktop wallpaper, all the windows are gone*,
   - xfce4-panel is gone*,
   - xmobar is gone*.
   - Sometimes, it stops responding to XMonad keyboard shortcuts, but when that works, after I, say, open a terminal window, the rest of the windows on that workspace also appear.

* "Gone" as in invisible as far as I can tell, because I can see the processes still running using top.

Instead, I have to manually switch the monitor off when i'm done computing. I'm wondering if this is a driver issue or what? I'm on AMD Ryzen 3 3200G with Vega graphics (Picasso), using XUbuntu 20.04.

I have the very same setup on my laptop and it works flawlessly.

What made me think it's drivers is the fact that my XFCE Power Manager is also screwed, because it doesn't show the option to set the brightness, for example, whereas my laptop lets me do that.

I tried to install the latest drivers however the problem persists.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-48-generic 5.4.0-48.52
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: alex 943 F.... pulseaudio
 /dev/snd/pcmC1D0p: alex 943 F...m pulseaudio
 /dev/snd/controlC0: alex 943 F.... pulseaudio
 /dev/snd/timer: alex 943 f.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Sat Oct 10 18:21:48 2020
InstallationDate: Installed on 2020-04-24 (169 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: System manufacturer System Product Name
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic root=UUID=814ca272-4d98-4b58-aec5-4262c52075c1 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-48-generic N/A
 linux-backports-modules-5.4.0-48-generic N/A
 linux-firmware 1.187.3
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/30/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5207
dmi.board.asset.tag: Default string
dmi.board.name: PRIME A320M-K
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5207:bd08/30/2019:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEA320M-K:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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

This change was made by a bot.