Re: [Xen-users] Can HVM DomU with SDL do 1280x1024 24-bit color?

[Geert Janssens <info@xxxxxxxxxxxx>]

Hi Derek,

Unfortunatly, I have no other idea. As I said, I didn't try the stdvga option 
in xen as I don't have any hvm domU.

I know it works in Qemu with Windows XP as a guest. For Qemu, that option is 
all I need. Looking in the device manager, there is no driver for the virtual 
graphics card either. It's indicated as a standard VGA compatible device. But 
even with this setup, I can select higher resolutions.

Regards,

Geert

P.S.: be sure to keep replies on the list. Others may be interested in this 
tread too.

On Wednesday 7 November 2007, Derek wrote:
> Aha, a clue...
>
> I noticed that with stdvga=1, when I boot the HVM, winXP reports new
> hardware detected VGA device.  When I try letting it search for drivers, it
> doesn't find any.  Then it gives me only 640x480 4-bit color.
>
> Perhaps if I had the right windows driver corresponding to the emulated
> stdvga=1 "hardware", I'd be all set.  Any idea how to find it or what to
> use?
>
> Thanks,
> Derek.
>
> On 11/7/07, Derek Sherlock <xen@xxxxxxxxxxxxxxxx> wrote:
> > Hi Geert,
> >
> > Thanks for the suggestion.  I tried it.
> >
> > Unfortunately, stdvga=1 makes matters worse.  With stdvga=1 the only one
> > resolution (640x480) and one color depth (4-bit) is offered.
> >
> > Maybe there's some other option I need to configure the emulator to to
> > offer other resolutions, but I've not been able to find it.  Googling
> > hasn't turned up anything either, although I'll try again when I have
> > more time.
> >
> > Cheers,
> > Derek.
> >
> >  On 11/7/07, Geert Janssens <info@xxxxxxxxxxxx> wrote:
> > > On Wednesday 7 November 2007, Derek wrote:
> > > > Hi,
> > > >
> > > > Is it possible for an HVM domU to use an emulated graphics screen
> > > > (via
> > >
> > > SDL)
> > >
> > > > of 1280x1024 24-bit ?
> > > >
> > > > Currently, my winXP domU allows you to select 1280x1024 16-bit, or
> > >
> > > 1024x768
> > >
> > > > 24-bit, but not 1280x1024 24-bit.  I assume this is a limitation in
> > >
> > > the
> > >
> > > > (virtual) graphics card hardware presented to the domU?
> > > >
> > > > Seems like it ought to be possible, since it's probably just a matter
> > >
> > > of
> > >
> > > > configuring how much (emulated) memory the (virtual) graphics card
> > >
> > > has.
> > >
> > > > But I don't know how to set it.  Any suggestions?
> > > >
> > > > Thanks,
> > > > Derek.
> > >
> > > By default, a Cirrus Logic GD5446 PCI VGA card is simulated. This card
> > > has the
> > > limitations you indicate above.
> > >
> > > What you probably want, is the stdvga=1 option in your xen config file.
> > > This
> > > will cause xen to emulate a standard vga graphics card with vbe 2.0 (I
> > > believe vbe stands for Video Bios Extensions), which allows you to set
> > > higher
> > > resolutions.
> > >
> > > Note that I haven't tried it myself yet, because I have currently no
> > > hvm
> > >
> > > domU's. The stdvga option is originally coming from the Qemu emulator.
> > > Xen
> > > uses Qemu's device model to emulate the hardware for hvm, and most of
> > > the
> > > Qemu options are supported. I quickly googled for stdvga xen, and I
> > > found a
> > > lot of references, so I guess this one is working also.
> > >
> > > Hope this helps.
> > >
> > > Geert
> > >
> > >
> > > --
> > > Kobalt W.I.T.
> > > Web & Information Technology
> > > Brusselsesteenweg 152
> > > 1850 Grimbergen
> > >
> > > Tel  : +32 479 339 655
> > > Email: info@xxxxxxxxxxxx
> > >
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