--- Comment #9 from Takashi Iwai firstname.lastname@example.org --- Thanks!
I forgot to ask, though, whether it's a regression. Did it work on Leap 15.1? If yes, could you check installing Leap 15.1 kernel onto Leap 15.2 system and retest? (Only if you still have Leap 15.2 system on your machine; TW installation wouldn't work with Leap 15.1 kernel due to the compressed firmware files.)
If it's confirmed to be a kernel regression since Leap 15.1 and TW kernel suffers, we should report it to upstream. Please report it to upstream devs, e.g. bugzilla.kernel.org? Feel free to put me (email@example.com) in Cc there.