(In reply to comment #22)
> Adding s3_bios to kernel parameters didn't work for me. The suspend just
> does not work anymore. Laptop wont suspend anymore.
> 
> My hardware:
> Asus -K55N
> Radeon HD7250G

You can also try: acpi_sleep=s3_mode or acpi_sleep=s3_bios,s3_mode

A little info here:https://www.kernel.org/doc/Documentation/power/video.txt