https://bugzilla.kernel.org/show_bug.cgi?id=60710
--- Comment #5 from Alex Deucher alexdeucher@gmail.com --- (In reply to Chris Rankin from comment #4)
(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).
Well a warm reboot may not have fuly reset the hardware; the bad state may have persisted.
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?
Sure, I just wouldn't hold out much hope for a fix :) r5xx hardware is pretty old.