As said, that patch got already backported and is included since 6.14.4-1, the regression in 6.14.8 has another cause, but FWIW, we can reproduce it on a system here and should be able to bisect this in the comming days.The bug I think it is is this: https://bugzilla.kernel.org/show_bug.cgi?id=220010
Says it's scheduled for kernel 6.16... ?
Another one I didn't look into is this: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2106553
For 6.15?