Re: [Xen-devel] beginnings of allowing more than the basic 80x25 VGA screen resolution

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 4 Jul 2005, at 09:00, Jan Beulich wrote:

> As far as I know, not only the VGA driver does not do any mode
> switching, even the VESA one doesn't (because the protected mode
> interface doesn't cover the mode switching functions as far as I
> remember). Only the video board specific frame buffer drivers are able
> to switch modes, and the bad thing (for me personally) is that even in
> 2.6.12 there still is no (64-bit) support for the i915 chipset. So I
> continue to be required to live with the video mode that XEN 'sets'
> prior to loading dom0, and short of it supporting a VESA console my
> first minimal attempt was to at least increase (and propagate) the size
> to the maximum possible without significant changes.
That's a pain. Maybe we can find a simple example somewhere of setting 
video mode via protect-mode VBE calls. I see that this functionality is 
missing from the kernel drivers -- it's all done in a monstrous 
real-mode assembly file. Any video card we care about these days should 
support VBE 2.0/3.0 I think, and those interfaces don;t require you to 
be runnign in real mode.
 -- Keir


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