https://bugs.freedesktop.org/show_bug.cgi?id=80868
--- Comment #12 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #11)
Alex, this is great! It works perfectly for me. I tried all available modes. Thanks a lot.
A follow up question: Is this setting supposed to be reset on reboot or remembered? It is reset for me. If one would like to have this remembered, in which tool should one ask for such a feature (kernel, X, DE, somewhere else)? Thanks.
It's up to the desktop environment. It should be saved as part of the display configuration (e.g., along with display modes, orientations, etc., etc.).