[radeon] Corrupt/skewed gnome-shell panel rendering

[Daniel Gauthier]

It would take more than one snapshot, but this all happens on Dell external monitor:

1. Top panel has blurred/smeared icons.
2. Hint tips on browser icons are also smeared.
3. Plank tips are smeared or blurry on some icons.

Screenshot after exiting full screen (could not restore to full) and top panel was set to autohide and would not budge.
https://justpaste.it/7rqzp

Otherwise, everything is okay on laptop monitor itself.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
Uname: Linux 5.3.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: Budgie:GNOME
Date: Sat Sep 28 13:23:08 2019
DistUpgraded: Fresh install
DistroCodename: eoan
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] [1002:6760] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Radeon HD 6470M [103c:161e]
InstallationDate: Installed on 2019-09-28 (0 days ago)
InstallationMedia: Ubuntu-Budgie 19.10 "Eoan Ermine" - Beta amd64 (20190926.1)
MachineType: Hewlett-Packard HP EliteBook 8460p
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-13-generic root=UUID=64852f66-77ef-4b0f-b326-aec23cfe7db3 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/06/2017
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68SCF Ver. F.65
dmi.board.name: 161C
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 97.4E
dmi.chassis.asset.tag: CNU148133S
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68SCFVer.F.65:bd04/06/2017:svnHewlett-Packard:pnHPEliteBook8460p:pvrA0001D02:rvnHewlett-Packard:rn161C:rvrKBCVersion97.4E:cvnHewlett-Packard:ct10:cvr:
dmi.product.family: 103C_5336AN
dmi.product.name: HP EliteBook 8460p
dmi.product.sku: LQ168AW#ABA
dmi.product.version: A0001D02
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.99-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.1.6-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20190820-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Daniel van Vugt (vanvugt)]

The resolution of your screenshot (1260x846) is interesting. That suggests you're using fractional scaling but the scale for the X and Y axes are different (1.333 / 1.2411).

Does the problem occur if you disable fractional scaling?

[Daniel Gauthier (daniel-gmx)]

Thank you Daniel for helping out.

I never touch the DEll's (external monitor) settings for any distro.
It would help if you could tell me which setting to look at.

[Daniel van Vugt (vanvugt)]

Maybe my comment #2 is wrong because the Xrandr output in the attached files doesn't suggest any scaling.

Still, as the first priority I would like to understand how and why the screenshot is an unusual resolution:

https://justpaste.it/img/43abe76d7c7deef69a379c2fabbf60b6.png

Has it been edited?

Can you please open 'Settings > Devices > Screen Display' and then take a screenshot of that?

[Daniel Gauthier (daniel-gmx)]

No, i did not edit the shot.
In fact, it was doing same on Ubuntu.
Tried Mate yesterday, although it had its issues, it did not have this one.

Running MX19.2b at present (in dual boot with Win10) and it too is okay with regards to this.
Would a screenshot of MX satisfy your request?

[Daniel van Vugt (vanvugt)]

Any desktop where the screenshots come out at that strange resolution would be OK. Just a screenshot of the desktop with 'Settings > Devices > Screen Display' open.

I'm focusing on this because it is resolution mixups which usually cause such skewed corruption in rendering. Although there is another issue in mutter I can think of that might cause this bug, that should usually correct itself if you click on the panel.

[Daniel van Vugt (vanvugt)]

Come to think of it, a more likely explanation is that this is part of radeon bug 1841718. Not sure why I didn't consider that before.

[Daniel Gauthier (daniel-gmx)]

Glad you got it sorted Daniel.

Can only imagine how hard it can be to remember all these "bugs".
Barely remember what i had for lunch!

Suppose it'll take a while...

[Daniel van Vugt (vanvugt)]

The fix for bug 1841718 has now been released in updates. Please update your system and tell us if this problem persists.

[Daniel Gauthier (daniel-gmx)]

You did it Daniel van Vugt! :)

Took a long time to boot after the upgrade, but the issue is resolved.

Thanks!