Bug 486886 - With AMD GPU, whitish pixels can be seen around dark-colored floating panels at certain fractional scale factors
Summary: With AMD GPU, whitish pixels can be seen around dark-colored floating panels ...
Status: REOPENED
Alias: None
Product: plasmashell
Classification: Plasma
Component: Panel (show other bugs)
Version: 6.3.1
Platform: openSUSE Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2024-05-11 13:07 UTC by Yoshio Sato
Modified: 2025-03-19 16:15 UTC (History)
6 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:


Attachments
screenshots of the white stuff arround panels with and without highlights (437.45 KB, application/zip)
2024-05-11 13:07 UTC, Yoshio Sato
Details
panel-6.2 (184.67 KB, application/zip)
2024-09-17 09:51 UTC, Yoshio Sato
Details
Plasma 6.2 Wayland on GTX 1650 with nvidia-smi (1.99 MB, image/png)
2024-09-20 15:58 UTC, Yoshio Sato
Details

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Description Yoshio Sato 2024-05-11 13:07:08 UTC
Created attachment 169376 [details]
screenshots of the white stuff arround panels with and without highlights

White pixels around panels

STEPS TO REPRODUCE
1. set this wallpaper: https://www.pexels.com/photo/wet-street-in-asian-city-10698429/
  or this wallpaper: https://www.pexels.com/photo/brown-and-white-concrete-houses-near-green-trees-4275887/
2. see some funky white stuff

OBSERVED RESULT
see some funky white stuff

EXPECTED RESULT
see no funky white stuff

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20240509
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.8.8-1-default (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 4800H with Radeon Graphics
Memory: 15.0 ГіБ of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: HP
Product Name: HP Pavilion Gaming Laptop 15-ec1xxx

ADDITIONAL INFORMATION
kscreen-doctor -o: https://pastebin.com/s470fb7k,
see the attachment
Comment 1 Nate Graham 2024-07-30 17:37:45 UTC
This is fixed in Plasma 6.2
Comment 2 Yoshio Sato 2024-08-03 13:17:47 UTC
(In reply to Nate Graham from comment #1)
> This is fixed in Plasma 6.2

Bloody hell, unbelievable!
This bug was in Plasma since the 5.X versions, and it is finally fixed!
Comment 3 Yoshio Sato 2024-09-14 22:37:29 UTC
(In reply to Nate Graham from comment #1)
> This is fixed in Plasma 6.2

Installed Plasma 6.2 (6.1.80git.20240914T013915~5366b8cb-ku.96.1) from the openSUSE KDE unstable repos, problem is still here with even an additional visual glitch. Is it just not merged yet, or am I on a wrong version of Plasma 6.2?

The repositories were added with the following commands:
zypper ar -fp 75 https://download.opensuse.org/repositories/KDE:/Unstable:/Qt/openSUSE_Tumbleweed/ KDE:Unstable:Qt
zypper ar -fp 75 https://download.opensuse.org/repositories/KDE:/Unstable:/Frameworks/openSUSE_Factory/ KDE:Unstable:Frameworks
zypper ar -fp 75 https://download.opensuse.org/repositories/KDE:/Unstable:/Applications/KDE_Unstable_Frameworks_openSUSE_Factory/ KDE:Unstable:Applications
zypper ar -fp 75 https://download.opensuse.org/repositories/KDE:/Unstable:/Extra/KDE_Unstable_Frameworks_openSUSE_Factory/ KDE:Unstable:Extra
Comment 4 Nate Graham 2024-09-16 15:50:30 UTC
Hmm, let's make sure we're talking about the same thing. Can you attach a new screenshot of the thing you see in the 6.2 beta with those wallpapers?

Also, what are your Plasma theme and your color scheme set to?
Comment 5 Yoshio Sato 2024-09-17 09:51:01 UTC
(In reply to Nate Graham from comment #4)
> Hmm, let's make sure we're talking about the same thing. Can you attach a
> new screenshot of the thing you see in the 6.2 beta with those wallpapers?
> 
> Also, what are your Plasma theme and your color scheme set to?

My Plasma theme is Breeze Dark, color scheme is also set to Breeze Dark with accent colors enabled.
On the new screenshots you can now also see a partially transparent line that runs along the bottom part of the panel and even goes on a bit on the right "corner" of the panel.
Comment 6 Yoshio Sato 2024-09-17 09:51:26 UTC
Created attachment 173757 [details]
panel-6.2
Comment 7 Yoshio Sato 2024-09-17 10:13:42 UTC
*you need fractional scaling enabled (I use 120%)
Comment 8 Nate Graham 2024-09-17 17:24:46 UTC
Hmm, I wonder if this could be related to graphics drivers. I am unable to reproduce it with a floating panel using a dark color scheme and Plasma theme with any fractional scale factor I try (105% - 145%). I am using an Intel HD630 iGPU though.
Comment 9 Samuel Jimenez 2024-09-17 18:58:39 UTC
It does look like graphics drivers. Also seeing this and using AMD Radeon.

Panel must be Floating
Opacity cannot be Opaque
Visibility > Always visible overrides Floating if another window is close enough. All other settings can cause it.
Any theme and wallpaper will do, as long as the panel provides sufficient contrast to the wallpaper or window behind it to make the issue obvious.
Only certain combinations of scale and panel height will trigger it. I see it with height 36 at 105%.
Comment 10 Nate Graham 2024-09-17 23:26:25 UTC
Thanks a lot! Any ideas here, KWin folks?
Comment 11 Yoshio Sato 2024-09-20 15:57:26 UTC
Started Plasma on my NVIDIA GTX 1650 with the same visual bugs, so it may be not AMD specific.
(attaching the screenshot with nvidia-smi)
Comment 12 Yoshio Sato 2024-09-20 15:58:17 UTC
Created attachment 173912 [details]
Plasma 6.2 Wayland on GTX 1650 with nvidia-smi

Plasma 6.2 Wayland on GTX 1650 with nvidia-smi
Comment 13 Niccolò Venerandi 2025-03-19 15:40:47 UTC
Does disabling the contrast effect (and possibly the blur effect) make the effect disappear?
Comment 14 Yoshio Sato 2025-03-19 16:15:56 UTC
(In reply to Niccolò Venerandi from comment #13)
> Does disabling the contrast effect (and possibly the blur effect) make the
> effect disappear?

Hey, just watched your video!
Disabling the blur effect does makes the effect disappear, the contrast effect doesn't seem to effect this.