Launchpad Bug Reporter

  1. Bug #752542
  2. Comment #66

Comment 66 for bug 752542

Revision history for this message
bwalex (ahornung) wrote : Re: ACPI DSDT information

Hi,

I got a Lenovo ThinkPad T520. The discrete is an nVidia NVS 4200M.
Integrated is:
[ 3.307635] i915 0000:00:02.0: power state changed by ACPI to D0
[ 3.307644] i915 0000:00:02.0: power state changed by ACPI to D0
[ 3.307650] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 3.307659] i915 0000:00:02.0: setting latency timer to 64
[ 3.359021] i915 0000:00:02.0: irq 43 for MSI/MSI-X
[ 3.895182] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

According to the test_off script in the acpi_call repo, the following method works, but there is no drop in power consumption unlike when disabling the discrete graphics in the BIOS.
Trying \_SB.PCI0.LPC.EC.PUBS._OFF: works!

The DSDT file is attached, but is similar to one posted before for a T420.

Regards,
Alex