[Bug 1933788] Re: post qa-test install, adjusting displays to match setup & display becomes blocky mess

A subsequent reboot and the screen was as expected, the blocky-glitches
on my-left-display were gone... System appeared normal and exactly as
expected.

I also re-ran the install, this time into the other partition, and NO
ISSUES occurred this time..

I can't see that I did anything different, as the displays are by
default in the correct position, and all I change is the portrait-left
tilt, which requires no guess work in KDE/Kubuntu as it's selected by
picture and I hit apply.

Either WAY what I consider an identical install (same box, just
different partition using the same daily ISO) and THE ISSUE DID NOT RE-
OCCUR !

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https://bugs.launchpad.net/bugs/1933788

Title:
post qa-test install, adjusting displays to match setup & display
becomes blocky mess

Status in linux package in Ubuntu:
New

Bug description:
kubuntu impish install (QA) on
-

New impish (daily) looks good on login. As part of testing the new
system, I adjust displays to my configuration; which required changing
right-display to portrait-left tilt. On performing that function I
get

** Expected results

I expected the right-display to portrait-left tilt, and left-display
to remain unchanged.

** Actual results

Right display did portrait-left tilt & is perfectly usable (what I'm
using now). The left display however is now just a blocky mess that
changes as I type, and slowly flashes (at the bottom of display).

https://photos.app.goo.gl/BvUTkDczbqU78q8G6

** Package

Package is likely wrongly marked; likely radeon related (or whatever
graphics exists in this box)

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.11.0-20-generic 5.11.0-20.21+21.10.1
ProcVersionSignature: Ubuntu 5.11.0-20.21+21.10.1-generic 5.11.21
Uname: Linux 5.11.0-20-generic x86_64
ApportVersion: 2.20.11-0ubuntu67
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: guiverc 780 F.... pulseaudio
 /dev/snd/pcmC0D0p: guiverc 780 F...m pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Mon Jun 28 14:47:15 2021
InstallationDate: Installed on 2021-06-28 (0 days ago)
InstallationMedia: Kubuntu 21.10 "Impish Indri" - Alpha amd64 (20210627)
IwConfig:
 lo no wireless extensions.

 enp0s25 no wireless extensions.
MachineType: Dell Inc. OptiPlex 755
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-20-generic root=UUID=2dc50c61-35cd-4c21-a9ba-819a5aeedc7f ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.11.0-20-generic N/A
 linux-backports-modules-5.11.0-20-generic N/A
 linux-firmware 1.198
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/30/2008
dmi.bios.release: 11.0
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A10
dmi.board.name: 0DR845
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA10:bd04/30/2008:br11.0:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0DR845:rvr:cvnDellInc.:ct3:cvr:
dmi.product.name: OptiPlex 755
dmi.sys.vendor: Dell Inc.

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