i915/kms/backlight-combo mode problem

[Michael Chang]

2011/5/16 Melchior FRANZ <melchior.franz at gmail.com>:

> I don't even know what an LBPC is, other than a variable named like that.
> So I'd need a hint for how to test that.

It resides at your vga adapter's pci configuration space, offset 0xf4.

You can know your LPBC value by:
  $ lspci -xxx -s 00:02.0 | awk '/^f0:/ {print $6}'

And alter it's value via setpci (assuming set it to max)
  $ setpci -s 00:02.0 F4.B=ff

I assume you've tried this .. as you report setpci works for you. :)