bumblebee on laptop

[andrey.rybak@bilkent.edu.tr]

hi community!
i have asus x550v laptop and two videocard on it:
$ lspci|egrep -i 'vga|3d'
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core
processor Graphics Controller (rev 09)
01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev ff)

so i need to install bumblebee for using both videocards. I had done it
with debian wiki suggestion:
#apt-get install bumblebee primus
everything is ok. I can run
$optirun glxgears
but FPS value is the same as if i used glxgears without optiran! What does
it mean? Speed of running of any application should be more high under
optiran. Thats output after glxgear finished:
300 frames in 5.0 seconds = 59.952 FPS
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
      after 29 requests (29 known processed) with 0 events remaining.
X Error of failed request:  BadDrawable (invalid Pixmap or Window parameter)
  Major opcode of failed request:  153 (DRI2)
  Minor opcode of failed request:  7 (DRI2GetBuffersWithFormat	)
  Resource id in failed request:  0x2000002
  Serial number of failed request:  2270
  Current serial number in output stream:  2270

My system is jessie.