SUMMARY Intermittently (a few times per day) my system enters a state where using modifier keys (shift, alt, control, super) results in the touchpad staying disabled when it should be disabled for just 250ms or not at all. The precise behavior is not always predictable, but at least one such mode comes up repeatedly. STEPS TO REPRODUCE 1. unknown requirements to enter the problematic mode 2. press and release Alt key 3. press and hold Alt key 4. release after a few seconds. OBSERVED RESULT Press and release causes the touchpad to disable for the configured delay, 250ms by default. Press and hold causes the touchpad to disable for the configured delay, then re-enable after the delay while the key is still held. Release causes the touchpad to disable indefinitely, until Alt is tapped again. EXPECTED RESULT As in normal usage, no part of modifier/shortcut usage should trigger the touchpad disabling behavior. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Kubuntu 19.04 KDE Plasma Version: 5.14.90 KDE Frameworks Version: 5.54.0 Qt Version: 5.11.3 ADDITIONAL INFORMATION This is probably a duplicate of #332654 from five years ago. I have run xev while the problem is extant and it registers all the keyboard events that I expect for pressing and holding and releasing the key, and no touchpad events when the touchpad is disabled.
Are you using the libinput backend or synaptics? Are most of the controls in the Touchpad settings UI disabled or grayed out?
I switched to synaptics in order to un-grey those settings. I am unsure if this problem coincided with that switch. I will switch back and report my findings.
Thanks!
Hello! This bug report concerns the Synaptics version of the Touchpad page, which is no longer supported in Plasma 6. Can you please see if the issue still happens when using Libinput? If so, please change the status back to "REPORTED." If not, go ahead and change it to "RESOLVED FIXED", or let the bot do it automatically after a month. Thanks!
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!