GNOME Bugzilla – Bug 646404
Brightness OSD loses Fn key events beyond a certain rate
Last modified: 2012-03-16 11:12:06 UTC
The Brightness OSD in GNOME 3.0 (Fedora 15 Alpha) loses Fn+F6/Fn+F7 (brightness up/down) key events if they are typed faster than the display can update -- and the OSD seems to have a lag of somewhere between 300 and 500ms between when the key is pressed and when the display updates. Therefore if you are quickly tapping the Fn-key combination a number of times a second, many of the keypress events are ignored and discarded, which makes the OSD feel laggy and unresponsive.
(This is on a Toshiba laptop, which I'm sure the exact Fn key combinations are unique to -- but the problem feels like it is happening in the UI layer and is not hardware-specific.)
Works for me in GNOME 3.2