429266 2020-11-17 21:34:31 +0000 Unplugging and replugging screen leads to configuration issues 2021-07-17 19:38:22 +0000 1 1 4 Plasma KScreen common 5.20.3 Neon Linux RESOLVED UPSTREAM NOR normal --- 0 sephiroth_pk kscreen-bugs-null ongun.kanat 0 oldest_to_newest 1976129 0 sephiroth_pk 2020-11-17 21:34:31 +0000 SUMMARY I have a laptop connected to a USB-C docking station, which is then connected to an external monitor using a DisplayPort cable. If I plug in the docking station at login time, the screen is enumerated as "DisplayPort-4", but if I unplug and then re-plug the dock the screen becomes "DisplayPort-5" and loses all the associated configuration (e.g. panels, docks, wallpaper, etc). To be more correct, it does not use the configuration, as it is seen as a different screen; the configuration is not actually lost. Moreover, when I re-plug the USB-C cable I have to manually activate the screen, otherwise it is disabled. If I plug in the dock after the login, then everything works as expected and unplugging and re-plugging the dock has no effect whatsoever on the screen as it should be. STEPS TO REPRODUCE 1. plug in a display at login 2. unplug it after the login 3. re-plug it OBSERVED RESULT The screen is disabled and needs manual enabling in the settings; moreover, it "loses" the configuration with elements such as panels, docks and wallpapers not being shown. EXPECTED RESULT Re-plugging the screen leads to it working as it did before unplugging it. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Neon Focal KDE Plasma Version: 5.20.3 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION 2006150 1 sephiroth_pk 2021-02-24 22:54:32 +0000 I found out in the intervening time that this issue can be avoided completely by getting to the login screen without the external monitor plugged in. Plugging it in after the login leads to everything working as expected. 2014700 2 ongun.kanat 2021-03-12 00:32:03 +0000 I don't think this is a Plasma/KScreen bug. Probably a kernel or userspace driver bug. Because one can check xrandr and replugging will result in increment in the port number. 2015527 3 sephiroth_pk 2021-03-15 16:17:22 +0000 (In reply to Ongun Kanat from comment #2) > I don't think this is a Plasma/KScreen bug. Probably a kernel or userspace > driver bug. Because one can check xrandr and replugging will result in > increment in the port number. It may indeed be an issue with the kernel or with the userspace driver, but the issue was not present before Plasma 5.19 and this is what has led me to file the bug here. 2046014 4 139962 ongun.kanat 2021-07-09 02:25:15 +0000 Created attachment 139962 The outputs before unplugging the dock Sorry for the delayed response. Due to many hardware issues with my T14, I stopped using Linux as my main desktop OS. I booted my system and noticed the bug again and remembered this bug report so I decided to test it properly. Hardware info: Thinkpad T14 AMD Gen 1 and Thinkpad USB-C dock Gen 2 This is definitely not a KDE / KWin / KScreen bug. To be sure, I decided to use a completely different software stack to test it. I used a wlroots based Wayland compositor, Wayfire [1]. With wlr based compositors, one can use wlr-randr utility in a similar way to xrandr. As it can be seen in the attachments the port organization changes after unplugging and replugging the dock. 2046015 5 139963 ongun.kanat 2021-07-09 02:25:53 +0000 Created attachment 139963 The outputs after replugging the dock 2047489 6 sephiroth_pk 2021-07-17 19:38:22 +0000 (In reply to Ongun Kanat from comment #4) > Created attachment 139962 [details] > The outputs before unplugging the dock > > Sorry for the delayed response. Due to many hardware issues with my T14, I > stopped using Linux as my main desktop OS. I booted my system and noticed > the bug again and remembered this bug report so I decided to test it > properly. > > Hardware info: Thinkpad T14 AMD Gen 1 and Thinkpad USB-C dock Gen 2 > > > This is definitely not a KDE / KWin / KScreen bug. To be sure, I decided to > use a completely different software stack to test it. I used a wlroots based > Wayland compositor, Wayfire [1]. With wlr based compositors, one can use > wlr-randr utility in a similar way to xrandr. As it can be seen in the > attachments the port organization changes after unplugging and replugging > the dock. Thank you for your effort! I'm marking this as an upstream bug then. 139962 2021-07-09 02:25:15 +0000 2021-07-09 02:27:13 +0000 The outputs before unplugging the dock before_replug.txt text/plain 1806 ongun.kanat RFAtMyAiVW5rbm93biBVMjc5MEIgMHgwMDAwOTY1OCAoRFAtMykiCiAgUGh5c2ljYWwgc2l6ZTog NjAweDM0MCBtbQogIEVuYWJsZWQ6IG5vCiAgTW9kZXM6CiAgICAzODQweDIxNjAgcHgsIDU5Ljk5 NzAwMiBIeiAocHJlZmVycmVkKQogICAgMzg0MHgyMTYwIHB4LCA2MC4wMDAwMDAgSHoKICAgIDM4 NDB4MjE2MCBweCwgNTkuOTM5OTk5IEh6CiAgICAzODQweDIxNjAgcHgsIDUwLjAwMDAwMCBIegog ICAgMzg0MHgyMTYwIHB4LCAzMC4wMDAwMDAgSHoKICAgIDM4NDB4MjE2MCBweCwgMjkuOTY5OTk5 IEh6CiAgICAzODQweDIxNjAgcHgsIDI5Ljk4MTAwMSBIegogICAgMzg0MHgyMTYwIHB4LCAyNS4w MDAwMDAgSHoKICAgIDM4NDB4MjE2MCBweCwgMjQuMDAwMDAwIEh6CiAgICAzODQweDIxNjAgcHgs IDIzLjk3NjAwMCBIegogICAgMTkyMHgyMTYwIHB4LCA1OS45ODc5OTkgSHoKICAgIDI1NjB4MTQ0 MCBweCwgNTkuOTUxMDAwIEh6CiAgICAxOTIweDEwODAgcHgsIDYwLjAwMDAwMCBIegogICAgMTky MHgxMDgwIHB4LCA1OS45Mzk5OTkgSHoKICAgIDE5MjB4MTA4MCBweCwgNTAuMDAwMDAwIEh6CiAg 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