When running the 5.15 kernel, visual glitches are present (using X1 Carbon Gen 9 with Intel Xe graphics) and there is a significant slowdown when interacting with UI elements (on both X11 and Wayland)
Available wifi connections are missing characters in their titles and have blank spaces (e.g. an SSID called “MyWifi” will appear as “M Wi i”)
Logs report a large number of Plasmashell kf.plasma.quick: Couldn't create KWindowShadow for PlasmaQuick::Dialog(0x55cb623bcc10)
Large number of plasmashell file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/logic.js:22: TypeError: Cannot read property 'devices' of undefined
5.14 works without issue (this was actually the first time I’ve had an issue with a kernel update in Manjaro)
I’ve switched back to 5.14 for the time being. The X1C Gen 9 runs Tiger Lake so my thinking is that support for it’s hardware in the kernel will mature over time and running the most recent kernel may improve reliability/performance so I try to upgrade to the latest stable kernel possible.
No issues here with an older Intel (i5-8250U Kaby Lake, internal UHD-Graphics 620) and KDE.
The plasmashell warnings about wrong variable types are present for me, too. I guess this is pretty common and I guess it has to do with older/upgraded settings or not-so-careful developers…
I’m also getting GPU hangs at startup with kernel 5.15.2-2 on my Razer Book 13 with Tigerlake i7-1165G7 with Xe graphics. I switched back to 5.14.18-1 for now, with which I don’t have any issues.
You should see them in the system log application (I think it’s called KSystemLog)
Keep that log application open and see what warnings and errors come up. There’s a lot in there and just because warnings or errors appear doesn’t necessarily mean something is wrong but if you notice something isn’t working properly in your regular usage, it’s a good idea to keep an eye on those log files in case anything related pops up.
Fortunately the changeset is a single line so it should be easy for someone more knowledgeable with the codebase to see if the commit hould be reverted or fixed in another way.
I am extremely pleased using the new 5.15 kernel. It suspends and resumes from sleep not only perfectly but much quicker than the 5.10x kernel did. I am using the Nouveau driver, btw.