'Half-Life 2: Deathmatch' runs mediocre for me at best. On the maps I play on, the video quality ranges from somewhat to very choppy. This wasn't the case when previously using an Nvidia GeForce GT 240 graphics card. The audio is fine. The low frame rates sometimes improve when I go to the outer limits of the map and face a wall.
Regardless, thank you, AMD Linux developers, for working at improving the drivers.