I can take video of the effect when I get off work if that would help. I haven't read anywhere of any hangs related to that extension in general. I suppose we could answer the question if _anyone_ else in linux land uses fglrx rather than the open source driver and still experiences the stutter or not. Or any other driver.

I see some weird bright spots on rocks. http://kitchen.nfshost.com/ven/dump0176.jpg
At first I thought it was due to the weapon fire from the hive or some dropped loot, but it's static and later on I got the same thing in a sector without hive.

It's with a Radeon HD5670 and current Mesa.

I've been getting stalls recently too, even with the old GL driver. Could be that somethings wrong with my setup though.

EDIT:
Just tried it with onboard graphics (Radeon HD3200) With everything set to medium I get impressive 10fps at the login screen! The chip only supports GL 3.3 so it's neat that it runs at all.

That looks like stuck lights from the jump-in animations. I was seeing a lot of that in a hive central skirmish too where all the bots jumped in near a roid.

RS780s are pretty weaksauce. Did you make sure to set the CPU governor to Performance?

Could be. The spot that I saw in another sector may have been something else.

Dunno.. with catalyst the onboard chip used to run the game okish (with aa and glow disabled though). I don't remember if the performance gov was enabled but it didn't make noticable difference before. Radeontop also reported that chip was totally maxed out.

I went back to catalyst now. I had some anoying pm issues with the mesa driver anyway and performance is way better.

Maybe the GALLIUM_HUD variable could be useful for getting some information about those freezes? It draws some pretty graphs onto the screen. http://www.mesa3d.org/envvars.html

https://drive.google.com/file/d/0B6yF3M_pR-ojeFg4X3VkTUVwVGs/view?usp=sharing

This is basically indicative of the graphics pausing i see in normal gameplay.

opengl4 err log
https://drive.google.com/file/d/0B6yF3M_pR-ojbDdfcXJvbzZwbWM/view?usp=sharing

opengl4 info log
https://drive.google.com/file/d/0B6yF3M_pR-ojNGdaVlhtam1hM00/view?usp=sharing

That's what mine does too. If you have /fps and /toggleframerategraph on, it sticks out like a sore thumb.

I just checked this last night and my system doesn't have these issues. You guys using Nvidia or AMD for the GPU?

We're using Mesa's GL utilizing the open source drivers. Both using radeon cards.

you have to make sure also when testing the new renderer to switch it and exit the client and restart. Live switching between gl4 and the reference one yields visual artifacts and issues not indicative of how the renderer behaves when you do a fresh start with it already set.

Shrugs. I'm using a Nvida card and not seeing any issues at this time. I am running the game in a window at 1440x900 if that matters. (monitor res is 2560x1440)

Looks like the stuttering is a kernel bug: https://bugzilla.kernel.org/show_bug.cgi?id=90741