Steam games not launching when using Nvidia on Ubuntu 14?

Question

NVIDIA

Good day to all.
There was a problem launching games through steam when using discrete graphics from Nvidia.
I launch games in wine through optirun and everything works OK, it doesn’t work in steam, so the problem is steam, not the driver.
If you run games without parameters, on Intel video, then everything starts and plays, and if with type parameters:
primusrun %command%
then this rolls out in the terminal:

Game removed: AppID 10 "Counter-Strike", ProcID 25668 
Game update: AppID 10 "Counter-Strike", ProcID 26917, IP 0.0.0.0:0
ERROR: ld.so: object '/home/jidckii/.steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/jidckii/.steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
pid 26921 != 26919, skipping destruction (fork without exec?)
ERROR: ld.so: object '/home/jidckii/.steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/jidckii/.steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
pid 26920 != 26919, skipping destruction (fork without exec?)
ERROR: ld.so: object '/home/jidckii/.steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.

you can run the steam client itself through optirun, and then when you start the game, it swears about the same thing:

Game update: AppID 10 "Counter-Strike", ProcID 29809, IP 0.0.0.0:0
ERROR: ld.so: object '/home/jidckii/.steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/jidckii/.steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.

Googled a similar problem for many here and here, well, in principle. But in Russian there is little, but from English. not strong.
Tell me, who faced, how to solve ???
https://github.com/ValveSoftware/steam-for-linux/i...
steamcommunity.com/app/221410/discussions/0/558749...