problem to wakup after a suspend to ram

hi

laptop lenovo s430, suse 12.3 64bits, intel/nvidia video card 16Gig ram
after a short suspend to ram, i don’t have any problem
after a long suspend to ram, sometime i see the login screen and it’s disapear after 1 second and the screen is black, can’t no nothing

i don’t use any proprietary video driver

is there a way to know what is the problem? maybe a module block something…

thanks

is there a way to know all energy tool by every hardware?

KDE or Gnome, etc. ?

i use kde 4.10.2