https://bugs.kde.org/show_bug.cgi?id=458771
Bug ID: 458771
Summary: flickering
Product: frameworks-plasma
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libplasma
Assignee: plasma-b...@kde.org
Reporter: p...@pfortin.com
CC: m...@ratijas.tk, notm...@gmail.com
Target Milestone: ---
SUMMARY (frameworks-plasma is my best guess; sorry if wrong)
Random flickering; sometimes extremely fast, other times, slow, sometimes, even
acting as a toggle.
Affects windows, taskbar, systray, digital clock, individual icons, physical
screen areas, tabs in tabbed windows, etc.
I see many flickering reports; but most are against specific products. This
report is to inform KDE that the flickering problem is wide-spread; but appears
to be at a container level: windows, taskbar, systray, physical screen, etc as
containers.
Initially, I blamed firefox nightly:
https://bugzilla.mozilla.org/show_bug.cgi?id=1746708
More recently, seeing flickering on multiple applications: firefox, claws-mail,
libreoffice calc, ...
Sometimes, the flickering acts like a toggle switch:
- preform some activity: scroll, click, grab/move, select, etc.
- display does not change until I exit/enter the window; often, I have to move
the window ever so slightly for the display to update.
- window-shading/un-shading sometimes returns an empty window, until I move it.
STEPS TO REPRODUCE (firefox)
1. use firefox extensively (lots of windows & tabs)
2. start streaming some video; after a while (an hour or more usually)
3. flickering starts (video affected, sound continues) Usually, the video
stream is in a loop toggling between a couple of frames over and over -- speed
varies; not always the same speed.
In this case, I can open a new firefox window and move the affected tabs to the
new window which "solves" the issue for a while. So problem appears to be the
window as a container.
STEPS TO REPRODUCE (taskbar)
1. use the system
2. hours (usually) after system restarted, taskbar icons will do a "dance" back
and forth; sometimes one icon comes and goes, aggravating the "dance"
3. moving the mouse over the affected area affects the issue; usually stops the
flickering
STEPS TO REPRODUCE (random screen blocks flicker)
1. no idea what triggers these
2. have not seen an obvious trigger, kinda like a Venn diagram, but with
rectangles rather than circles.
3. what makes up the rectangles acting like a Venn diagram is not obvious to
date.
STEPS TO REPRODUCE (zoom video calls)
1. use it
2. after 15-30 minutes, zoom participants freeze or toggle between a couple of
frames
3. restart zoom clears it up. (zoom window is a container).
OBSERVED RESULT
flickering
EXPECTED RESULT
no flickering
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
Operating System: Mageia 9
KDE Plasma Version: 5.25.4
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
Kernel Version: 5.19.4-server-2.mga9 (64-bit)
Graphics Platform: X11
Processors: 20 × 12th Gen Intel® Core™ i7-12700K
Memory: 125.5 GiB of RAM
Graphics Processor: AMD Radeon RX 6600 XT
Manufacturer: Dell Inc.
Product Name: XPS 8950
ADDITIONAL INFORMATION
After many months of trying to find commonality[1], it's looking more like a
race condition.
claws-mail uses a notification icon in the systray; normally, updates (new
mail, unread mail, no mail) occur instantaneously. When the flickering problem
begins, the systray updates are delayed until the mouse is moved out/in the
claws-mail window.
When flickering gets excessive, even the digital clock starts to flicker digits
or the entire clock.
Just now, moved mouse over taskbar, and no tooltips appeared, until I switched
desktops.
[1] first saw this flickering on old Dell M6800 running Mageia8, so I'm not
convinced its a hardware issue as some have suggested.
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