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Updated and Optimized Ubuntu Free Graphics Drivers
I wouldn't know how to try dri3 to even test that.
With dri3 I mean the packages currently in 14.04 (dri3 enabled), which you supposed should have the problem. So:
- install the 14.04 updated dri3-enabled packages;
- try to reproduce the steam problem;
- if the problem appears install libudev1:i386 ;
- check again if the problem is fixed;
Switching is done automatically on 3.13 and newer. The dGPU is automatically powered down when not in use. You can get the old manual behaviour back by booting with radeon.runpm=0 on the kernel command line in grub.
I have 3.13 on Mint 16 and I don't think it works.
I've been using Oibaf's PPA on Trusty since Trusty first came out without any problems. That issue with Source games and libudev was already fixed a while back in mesa. The bug was only in mesa, and since Oibaf ships the latest mesa for Trusty and Saucy, there is no problem at all. We just need Oibaf to push the xserver-xorg-video parts to Trusty and to update LLVM to LLVM 3.5 since I'm stuck on OpenGL 3.1 with my RadeonSI card until he does that.