I did just try the upstream kernel as requested (linux-image-3.16.0-031600rc4-generic). This does (mostly) fix the problem, but not entirely, so I'll tag it bug-exists upstream.
1) I have all 3 monitors working correctly if I combine kernel 3.16 AND a hand-tuned xorg.conf 2) Without Xorg.conf , the monitors are not correctly autoconfigured. 3) Everything is now great in XFCE, but under KDE, 2 of the 3 monitors don't show the mouse-pointer. In case it's relevant, I'm still seeing dmesg errors of this type: [ 60.216937] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [ 60.216941] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing C7E8 (len 62, WS 0, PS 0) @ 0xC804 ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed ** Tags added: kernel-bug-exists-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1338622 Title: LCD monitor timing misdetected: 60Hz != 60 Hz To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1338622/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs