Re: Patch to control VGA bus routing and active VGA device.

[H. Peter Anvin]

Followup to:  <200501180946.47026.jbarnes@xxxxxxxxxxxx>
By author:    Jesse Barnes <jbarnes@xxxxxxxxxxxx>
In newsgroup: linux.dev.kernel
>
> On Monday, January 17, 2005 7:43 pm, Jon Smirl wrote:
> > Attached is a patch to control VGA bus routing and the active VGA
> > device. It works by adding sysfs attributes to bridge and VGA devices.
> > The bridge attribute is read only and indicates if the bridge is
> > routing VGA. The attribute on the device has four values:
> 
> How is it supposed to work?  Is VGA routing determined by the chipset?  Is it 
> separate from other legacy I/O and memory addresses?
> 

Yes, there are special control bits in any PCI bridge header for the
VGA ports.

	-hpa
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