https://bugzilla.kernel.org/show_bug.cgi?id=60710
--- Comment #4 from Chris Rankin rankincj@yahoo.com --- (In reply to Alex Deucher from comment #3)
The hw i2c engine somehow got into a bad state.
Not only that, but GNOME3 put the HW I2C engine back into that same "bad state" when I rebooted and logged back in. (The DVI-0 monitor was switched to a non-native 1680x1050 mode during the whole reboot process, but was then shut down and disconnected when GNOME3 was unable to reconfigure it for its native 1920x1200 mode).
hw i2c is diabled by default for a reason.
Yes, presumably because it has bugs like this in ;-). But surely that doesn't mean you're not interested in people reporting those bugs when they find them?