Intel: Brief blanking of external screen when querying xrandr 1.2

[Vedran Rodic]

>
> If your machine cannot ever have a TV adapter (even with a docking
> station), we can add a quirk to the driver to never look at the TV
> output. That requires the pci subsystem values (from lspci -n -v) to
> plug into the quirk table.

Here's one for the Lenovo Thinkpad X60s

00:02.1 0380: 8086:27a6 (rev 03)
        Subsystem: 17aa:201a
        Flags: fast devsel
        Memory at ee180000 (32-bit, non-prefetchable) [size=512K]
        Capabilities: [d0] Power Management version 2