I'm with you and I also had problems with HoN! I just realized they were Catalyst related. It's ridiculous I can't play nearly any game with Catalyst, because of damn lags. I thought there's something wrong with Xonotic, but with OS drivers it's flying. The same about ut2k4. I also tried StuntRally, 0ad and they're unplayable. StuntRally is very dark and runs slow like hell. In the past I had GF2 MX and Linux games worked better with it. The only solution is to use Open Source drivers or nVidia.
What's this input lag you speak of? Are we talking 0.5 secs, 2 to 3 secs lag or?
Just curious. I haven't noticed anything like this with a 4870.
the input lags are not all the time its only if the game use some function.
in hon for example if you try to drop a intem on the ground or in an allied hero. then the game show a little picture over the normal game onside of your mouse pointer and in this moment the mouse input lag because the catalyst can't handle this.
but this functionality is essential in HON if you play as a support you need to drop heal pods on your allies to support them.
its more like 0.5 sec but you never hit the allied hero because they run around and you need to hit them with the item in battle!
if you turn of the desktop effects with the radeon driver you do have similar problems with exact the same effect and situation.
but the radeon driver runs very well with desktop effect activated.
i think the problem is the mouse acceleration if the mouse turn into a little picture of a "item" then the graphic acceleration fail and need to load the picture.
anyway without that but in fact the mouse input with the radeon driver is overall much better with direct visual response than the catalyst driver!
Because phoronix is the only place you can see benchmarks of linux games and they continue to frame AMD cards in a favorable light (though not nearly as bad as they used to). Back when I had both ATi and nVidia cards reading the ATi articles here pissed me off, because I knew first-hand how terrible the drivers were compared to nVidia's. Anyone really wanting to see linux succeed on the desktop wouldn't have recommended ATi cards to anyone at that time. These days I can't comment since I'm ATi-free. It does seem like there is improvement in the drivers over those days. I'm actually hoping they catch up with nVidia, because I'd like to see strong Trinity support and performance.
It could be possible that some settings are just completely ignored by oss drivers. I saw speed issues with Intel onboard as well, i had to disable AA to get good framerates (AA is not that critical with high res, AF you see more). I would begin with less demanding settings first, no forced vsync/aa in amdcccle, just in app. Comparing oss against binary drivers is just like comparing apples and oranges.