Portal and TF2 are stuck at loading screen forever. TF2 has loaded very, very rarely. Portal has loaded twice, first time it got stuck after choosing new game, the second time it got stuck after I changed video settings.
The same problem, though not so frequent, is happening with Half Life 2 -- here I have loaded the game and played it successfully a couple of times already.
* 0. 00:01.0 AMD Radeon HD 6320 Graphics
1. 01:00.0 AMD Radeon HD 6400M Series
PowerXpress: Discrete GPU is active (High-Performance mode).
Posted a bug report here: Portal stuck on loading screen · Issue #2620 · ValveSoftware/steam-for-linux · GitHub