Ser9 user with a Y model here. Took a bit of extra time to confirm my personal outcome - but I have updated successfully to this supposed “linux solution” version 68 BIOS.
Now my system which worked with the workaround old Firmware from August does not work with ether.
Both old firmware and newest, if booted result in a black screen and freeze under Mint.
Downloaded the latest Mint ISO and booted from the stick fresh with the new BIOS does result for me in a freeze at the Mint Logo.
My only workaround now is back to the compatibility mode with zero gpu acceleration.
So in summery, for me things got worse…..