There isn’t anything obvious in your terminal output, though your sysinfo lists a lot of crashes.
If you load steam with the command STEAM_RUNTIME=0 steam do the games load correctly?
It doesn't work at all. Here is it's output: http://pastebin.com/SjkFKVXp
I will reinstall steam and it's games and see if it helps.
After reinstallation, steam started crashing in a few seconds after I open it. Here is log: http://pastebin.com/E2CAwpGU
Hello @entropyencoded, are you still experiencing this issue on an up to date system?
Today I bought complete set of Half-Life games and downloaded it. Every game worked perfectly.
After some time, I tried to play Half-Life 2, but I could see only a black screen. Same thing happened to episodes, but with first Half-Life didn't even get a black screen, though I could see a process of "hl_linux".
I'm absolutely sure that it is a steam bug, because I can run half-life from command line (like "./hl.sh -steam") and it works fine, but I would rather like to play it from steam.
I have reinstalled steam and games a few times, but it didn't help.
Here is my system info: http://pastebin.com/ZkuEWnnJ
And here is steam command line output: http://pastebin.com/GKiRkmLN