Problema com o STEAM

Bom dia Galera,

tenho um XPS 14 que vem com a placa de video hibrida intel+Nvidia.

fiz a instalação do bumblebee de boa estou usando o driver da nvidia 319.

agora quando eu meto um optirun steam pra poder jogar meu dota me da a seguinte mensagem de erro.

"OpenGL GLX context is not using direct rendering, which may cause performance problems."

ja fiz uma porrada de coisa sem sucesso com esse trem. tive ate que refazer a instalação do mint devido a bagunça heheheh.

alguem ja passou por isso ?

segue o log do bagui.

optirun steam
Running Steam on linuxmint 16 64-bit
STEAM_RUNTIME is enabled automatically
ERROR: ld.so: object 'libdlfaker.so' from LD_PRELOAD cannot be preloaded: ignored.
ERROR: ld.so: object 'librrfaker.so' from LD_PRELOAD cannot be preloaded: ignored.
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Xlib: extension "NV-GLX" missing on display ":0".
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number
[0224/111241:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation
Xlib: extension "NV-GLX" missing on display ":0".
Error: OpenGL GLX context is not using direct rendering, which may cause performance problems.

For more information visit https://support.steampowered.com/kb_...9938-EYZB-7457.
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Installing breakpad exception handler for appid(steam)/version(1392853084_client)
Generating new string page texture 7: 128x256, total string texture memory is 131,07 KB
Generating new string page texture 8: 48x256, total string texture memory is 180,22 KB
Generating new string page texture 9: 256x256, total string texture memory is 442,37 KB
Generating new string page texture 10: 64x256, total string texture memory is 507,90 KB