Comment 261 for bug 752542

Dear all,

I have a T420s (4176A13) with

00:02.0 VGA compatible controller [0300]: Intel Corporation Sandy Bridge Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
01:00.0 VGA compatible controller [0300]: nVidia Corporation Device [10de:1056] (rev a1) (prog-if 00 [VGA controller])

 - If I allow the Optimus in the BIOS both appear in lspci as listed above and power consumption is ~20W

 - If I deactivate the discrete card in the BIOS, it indeed does not appear in lspci and power consumption is ~12W.

 - If I allow the Optimus in the BIOS and I use acpi_call + test-off.sh, the script finished with success (on \_SB.PCI0.LPC.EC.PUBS._OFF) but the card still appears in lspci, power usage remains at 20W, and the usb mouse does not work anymore (it comes back to life after a suspend though.)

Any idea?

Cheers,

--
Francois