Hmm, then it’s ptobably newer bug. I have no clue then.
You can report it 
Or if you have a working kernel and want to learn something new, you can do the tedious Kernel BISECT, to find the offending commit.
Then you would have very hight chance to have it fixed, because the bisect would tell you Who broke it!
Other option is to use older kernel that works with your card and wait until it get fixed