Hello,
I recently updated my os (debian x64 SID). Here is the steam system information log:
http://pastebin.com/ZnXQ29kk

And since then I can't run various games (dota2/portal2/the swapper) using optirun/primusrun. They crash at startup (no black screen, no flickering, nothing).
In the meantime, I have no problem running other games with optimus (serious sam3), and I can even launch the problematic games on my intel chipset (but of course, performance are horrible on an intel chipset).
Of course, I had no problem before the update, and I have no idea of what broke those games.

I already tried pretty much everything I came across the internet. Checked the libraries (I might have missed some), reinstalled steam, bumblebee.

Here's the log of the problematic games;
dota2: http://pastebin.com/qvxBCcn7
portal2: http://pastebin.com/PHQBtPNg

And here is the optirun glxinfo log:
http://pastebin.com/nQf6GYYy

Thanks for reading, please tell me if you've got any clues of what is going on. And of course ask for more informations if you need them.