Created attachment 110768 [details] KWin has a left touch screen edge, but kwinrc doesn't know about it The following issue is a significant generator of online support requests and user complaints. People complain about "missed clicks" or a "dead pixel" on the left edge of the screen when using Xorg. For example, see Bug 380476 and Bug 387775. The issue is caused by KWin's left touch screen edge; turning it off resolves the issue. The fact that the left touch screen edge is always on by default appears to be a bug, which can be seen by doing the following: 1. $ rm ~/.config/kwinrc 2. Go to System Settings > Desktop Behavior > Touch Screen 3. Click the button corresponding to the right edge and set it to something 4. $ tail -n 5 ~/.config/kwinrc Kwinrc has the following: [TouchEdges] Bottom=None Left=None Right=ShowDesktop Top=None kwinrc knows about the right touch screen edge that you set, but thinks that there's no left touch screen edge. Yet, there is! See attached screenshot. If I have misinterpreted the situation that the left touch screen edge is enabled deliberately, then please ignore the above and instead consider this Bugzilla ticket to be a request to turn off left touch screen edge by default on X11 as it generates a steady stream of user complaints.
The left touch edge is enabled by default. I know it because I implemented it. For any key not present in the config file, the hardcoded default is used. This is a standard feature of KConfig API. In this particular case we have the following piece of code: touchConfig(QStringLiteral("TouchBorderActivate"), m_touchActivate, TabBoxWindowsMode, QStringList{QString::number(int(ElectricLeft))}); Deleting the config file while KWin is running has 0 effect. The setting will stay enabled by default. This is a maintainer decision! This is a useful feature and we seem to have conflicts here between users expecting it to work exactly like that and users not having a touch screen and having issues with that. In today's world we need to support touch screens by default in a sensible way (e.g. for notebooks) without looking like yesterdays thing. Thus this will stay on.
> Kwinrc has the following: > > [TouchEdges] > Bottom=None > Left=None > Right=ShowDesktop > Top=None Btw. that's not how the screen/touch edges work. The settings exist multiple times. You need to look into the TabBox settings group to find it enabled.