uname -a
Linux book 3.16.0-4-amd64 #1 SMP Debian 3.16.7-2 (2014-11-06) x86_64 GNU/Linux

optirun --status
Bumblebee status: Ready (3.2.1). X inactive. Discrete video card is off.

lsmod | grep intel
intel_powerclamp       17159  0 
intel_rapl             17356  0 
kvm_intel             139116  0 
kvm                   388635  1 kvm_intel
ghash_clmulni_intel    12978  0 
aesni_intel           151423  6 
aes_x86_64             16719  1 aesni_intel
lrw                    12757  1 aesni_intel
glue_helper            12695  1 aesni_intel
ablk_helper            12572  1 aesni_intel
cryptd                 14516  3 ghash_clmulni_intel,aesni_intel,ablk_helper
snd_hda_intel          26327  3 
snd_hda_controller     26727  1 snd_hda_intel
snd_hda_codec         104463  5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_pcm                88662  4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
snd                    65244  14 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel
thermal_sys            27642  4 video,intel_powerclamp,processor,x86_pkg_temp_thermal
crc32c_intel           21809  0