SUMMARY At Kubuntu 20.10 everithing works fine. After update to Kubuntu 21.04 I have a bug with connection to external monitors wia dock station. Direct connection wia HDMI works fine. Laptop: Lenovo ThinkPad T490 STEPS TO REPRODUCE 1. Connecting monitors wia dock station 2. N/A 3. N/A OBSERVED RESULT At "Display Configuration" I see that monitors are detected correctly. And when mouse moved to borders it's moved like to another display, looks that monitors are available. But monitors show that "Cable is not connected". Laptop start to work very slow (long animation time, and widgets loading). Memory and CPU consumption is almost the same as before connection to monitors. EXPECTED RESULT Monitors displays picture, and laptop work fast as before connection. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Kubuntu 21.04 (available in About System) KDE Plasma Version: 5.21.4 KDE Frameworks Version: 5.80.0 Qt Version: 5.12.2 ADDITIONAL INFORMATION It's my working laptop, and I should decide to stay on fresh Kubuntu. Can I collect logs somehow ?
any updates ?
Hello, I believe this is same issue as https://bugs.kde.org/show_bug.cgi?id=437470. I've attached logs there.
Look that it has similar symptoms. Will see if it's the same RC. I'll follow that rapport to
Hi, I have upgraded plasma to 5.22.3 using: https://9to5linux.com/you-can-now-install-kde-plasma-5-22-on-kubuntu-21-04-heres-how Issue still exist
Checked by Live USB: latest Manjaro (Plasma 5.21.4) and KdeNeon (Plsma 5.22.3). And all works fine. Looks that issue exist only at Kubunu 21.04
Makes sense, since Kubuntu 21.04 ships an older version of Plasma than the one in Manjaro and Neon (or a newer version of Kubuntu, for that matter).
But issue still exist on Kubunu 21.04 and newer Plasma 5.22.3
I'll check Ubuntu 21.04 live USB, if it's problem with Plasma or Ubuntu
On Ubuntu 21.04 the same issue. Look that issue isn't relative to KDE Plasma. Can we somehow redirect this issue to Ubuntu or should I create new one there ?
Issue was at the kernel linux-image-5.11.0-22-generic side. Installing newer kernel linux-image-unsigned-5.13.1-051301-generic solves a problem