Comment 543 for bug 752542

Using Lenovo IdeaPad Y480, the BIOS has the video card in switching mode.

I am using the acpi-handle-hack patch from "Sat Sep 22 12:34:26 2012 -0700"

gordon@silvernight:~/workspace/bbswitch$ optirun glxgears
[ 356.229884] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) NVIDIA(0): Failed to initialize the NVIDIA GPU at PCI:1:0:0. Please

[ 356.229977] [ERROR]Aborting because fallback start is disabled.

root@silvernight:~# modprobe bbswitch
FATAL: Error inserting bbswitch (/lib/modules/3.2.0-31-generic/updates/dkms/bbswitch.ko): No such device
root@silvernight:~# dmesg|tail
[ 115.629162] CPU4: Package power limit normal
[ 115.629168] CPU5: Package power limit normal
[ 115.629176] CPU7: Package power limit normal
[ 115.629182] CPU6: Package power limit normal
[ 310.380665] bbswitch: version 0.4.2
[ 310.380678] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[ 310.380691] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.VGA_
[ 310.380717] bbswitch: failed to evaluate _DSM {0xF8,0xD8,0x86,0xA4,0xDA,0x0B,0x1B,0x47,0xA7,0x2B,0x60,0x42,0xA6,0xB5,0xBE,0xE0} 0x100 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[ 310.380730] bbswitch: failed to evaluate _DSM {0xA0,0xA0,0x95,0x9D,0x60,0x00,0x48,0x4D,0xB3,0x4D,0x7E,0x5F,0xEA,0x12,0x9F,0xD4} 0x102 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[ 310.380779] bbswitch: No suitable _DSM call found.