https://bugzilla.kernel.org/show_bug.cgi?id=209457
--- Comment #18 from Илья Индиго (ilya@ilya.pp.ua) --- (In reply to Илья Индиго from comment #17)
I have the same problem with the Radeon HD 7770.
I have the same problem with the Radeon HD 7770. This also happens with the amdgpu and radeonsi drivers. It enters the S1 mode (although in the BIOS I specified to use only S3) and does not exit it. With the old videocard, the 8600GT with nouveau entered S3 mode and exited normally.