https://bugs.kde.org/show_bug.cgi?id=434895
Bug ID: 434895
Summary: Modifier keys not registering properly at random
intervals
Product: kwin
Version: 5.21.3
Platform: openSUSE RPMs
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: input
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 137036
--> https://bugs.kde.org/attachment.cgi?id=137036&action=edit
Kwin RC
SUMMARY
Kwin oddly swallows modifier keys at random intervals. Spits out strange errors
in the Xorg log.
STEPS TO REPRODUCE
1. Use my kwin shortcuts a lot during the day
2. At random times, the combination doesn't register, only the key after the
modifier. So Meta_R + a becomes a only. Ctrl + F11 becomes F11 only.
3. Do it twice in a row and it works fine for the next few seconds, sometimes
minutes. I can't find any pattern to this.
OBSERVED RESULT
Shortcuts failing to register properly.
EXPECTED RESULT
Shortcuts registering properly.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.21.3
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
Kernel: 5.11.6.1-default
CPU: Ryzen 7 1800X, 16GB of DDR4 RAM. The strange log in /var/log/Xorg.0.log:
[ 46572.992] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 11ms, your system is too slow
[ 50351.616] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 11ms, your system is too slow
[ 50661.465] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 25ms, your system is too slow
[ 51111.930] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 51219.446] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 16ms, your system is too slow
[ 51434.637] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 16ms, your system is too slow
[ 51699.953] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 51934.153] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 12ms, your system is too slow
[ 51934.153] (EE) event0 - Logitech Gaming Mouse G502: WARNING: log rate limit
exceeded (5 msgs per 60min). Discarding future messages.
[ 52120.593] (II) event0 - Logitech Gaming Mouse G502: SYN_DROPPED event -
some input events have been lost.
[ 52236.329] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 33ms, your system is too slow
[ 52259.866] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 22ms, your system is too slow
[ 52332.789] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 13ms, your system is too slow
[ 52332.789] (EE) event4 - Logitech USB Keyboard: WARNING: log rate limit
exceeded (5 msgs per 60min). Discarding future messages.
[ 54397.158] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 16ms, your system is too slow
[ 55006.720] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 16ms, your system is too slow
[ 55010.454] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 55816.296] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 56357.926] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 56403.128] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 11ms, your system is too slow
[ 56500.714] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 12ms, your system is too slow
[ 56500.714] (EE) event0 - Logitech Gaming Mouse G502: WARNING: log rate limit
exceeded (5 msgs per 60min). Discarding future messages.
[ 59036.218] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 11ms, your system is too slow
[ 59575.628] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 20ms, your system is too slow
[ 59589.693] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 14ms, your system is too slow
[ 59895.297] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 59950.598] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 60082.096] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 60082.096] (EE) event0 - Logitech Gaming Mouse G502: WARNING: log rate limit
exceeded (5 msgs per 60min). Discarding future messages.
[ 60170.271] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 19ms, your system is too slow
[ 60224.450] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 22ms, your system is too slow
[ 61960.538] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 18ms, your system is too slow
[ 62396.470] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 34ms, your system is too slow
[ 62396.470] (EE) event4 - Logitech USB Keyboard: WARNING: log rate limit
exceeded (5 msgs per 60min). Discarding future messages.
[ 62640.778] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 12ms, your system is too slow
[ 63349.467] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 13ms, your system is too slow
[ 63410.605] (EE) event4 - Logitech USB Keyboard: client bug: event processing
lagging behind by 17ms, your system is too slow
[ 64024.693] (EE) event0 - Logitech Gaming Mouse G502: client bug: event
processing lagging behind by 12ms, your system is too slow
The issue cannot be reproduced on Wayland KWin, or GNOME with the same hardware
set up. Keyboard has been swapped multiple times, the mouse mentions come from
the macros on my mouse. Which work fine everywhere else. Another finding is
that if there's no browser running (no idea if this is just related to higher
CPU usage or something), the problem never happens. The distro is openSUSE
Tumbleweed, updated today. Attaching my kwinrc.
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