https://bugzilla.kernel.org/show_bug.cgi?id=108561
--- Comment #4 from Elmar Stellnberger estellnb@elstel.org --- Now I have tested it with the proprietary Nvidia 340.xx driver: s2ram works flawlessly with the proprietary driver the external monitor getting re-enabled normally. However the non-oss driver runs unstable on my machine and is not an option. The bug is apparently a driver issue and not a firmware/acpi problem.