Xen devel - Jul 2009 - nographic=1 but still have a vga adapter

Is nographic=1 supposed to make there be no vga adapter at all? That''s
what I was hoping for but I still get the CL 5446 display adapter
detected.

Thanks

James

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I''m not sure whether a way to enable this has made it into the xen
config
file parsing, but the option to qemu-dm to remove the virtual vga card
completely is "-vga none"

-- Trolle

On Fri, Jul 3, 2009 at 2:35 AM, James Harper
<james.harper@bendigoit.com.au>wrote:
> Is nographic=1 supposed to make there be no vga adapter at all?
That''s
> what I was hoping for but I still get the CL 5446 display adapter
> detected.
>
> Thanks
>
> James
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>

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> 
> I''m not sure whether a way to enable this has made it into the xen
config file
> parsing, but the option to qemu-dm to remove the virtual vga card
completely
> is "-vga none"
> 
That option doesn''t seem to exist in the qemu that ships with 3.3 so I
upgraded to 3.4 (was going to soon anyway) and appended "-vga none"
via
a wrapper script for ''qemu-dm''. Unfortunately it just gives a
bus error
in qemu-dm so obviously there is some internal reliance on having a vga
adapter present.

The problem I''m trying to solve here is to get Windows to enter
standby.
It won''t because the Cirrus Logic 5446 adapter doesn''t support
it, and
neither does the ''stdvga'' driver. I tried corrupting the PCI
ID''s for
the CL-5446 but Windows just falls back to the ''vga save''
adapter, which
also doesn''t support standby.

Frustrating.

Does anyone know if it is the CL5446 driver that doesn''t support
standby, or if it is qemu''s implementation of the CL5446 that
doesn''t
support standby?

Thanks

James

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James,

I tent to believe that it''s the driver in Windows that prevents the
system
from entering stand-by, since if you''ll try the same on a Linux guest,
it
will go to stand-by without any problems.

Regarding the problem you have, there are 2 options to solve it:
1. Use VGA pass-through with IOMMU (should work on some of the devices with
Xen 3.4, and a compatible machine)
(However, i have tried it, and it didn''t work on my machine...)
2. Write your own basic wrapper driver for the display adapter, which will
support sleep. Maybe you will be able to find such driver out in the web...

Tom

2009/7/4 James Harper <james.harper@bendigoit.com.au>
> >
> > I''m not sure whether a way to enable this has made it into
the xen
> config file
> > parsing, but the option to qemu-dm to remove the virtual vga card
> completely
> > is "-vga none"
> >
>
> That option doesn''t seem to exist in the qemu that ships with 3.3
so I
> upgraded to 3.4 (was going to soon anyway) and appended "-vga
none" via
> a wrapper script for ''qemu-dm''. Unfortunately it just
gives a bus error
> in qemu-dm so obviously there is some internal reliance on having a vga
> adapter present.
>
> The problem I''m trying to solve here is to get Windows to enter
standby.
> It won''t because the Cirrus Logic 5446 adapter doesn''t
support it, and
> neither does the ''stdvga'' driver. I tried corrupting the
PCI ID''s for
> the CL-5446 but Windows just falls back to the ''vga save''
adapter, which
> also doesn''t support standby.
>
> Frustrating.
>
> Does anyone know if it is the CL5446 driver that doesn''t support
> standby, or if it is qemu''s implementation of the CL5446 that
doesn''t
> support standby?
>
> Thanks
>
> James
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>

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> James,
> 
> I tent to believe that it''s the driver in Windows that prevents
the
system
> from entering stand-by, since if you''ll try the same on a Linux
guest,
it will
> go to stand-by without any problems.
A Linux HVM guest? I had assumed it was probably the driver but thanks
for the confirmation.
> 
> Regarding the problem you have, there are 2 options to solve it:
> 1. Use VGA pass-through with IOMMU (should work on some of the devices
with
> Xen 3.4, and a compatible machine)
> (However, i have tried it, and it didn''t work on my machine...)
Unlikely to work on my test machine - it''s a bit old.
> 2. Write your own basic wrapper driver for the display adapter, which
will
> support sleep. Maybe you will be able to find such driver out in the
web...
> 
I have been looking for a dummy display driver (eg which windows thinks
is a display but isn''t really) and I was sure I''d find
something but not
so far...

Thanks

James

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> Does anyone know if it is the CL5446 driver that doesn''t support
> standby, or if it is qemu''s implementation of the CL5446 that
doesn''t
> support standby?
> 
Our backend Cirrus VGABIOS extension does support S3 but I found that the
Windows Cirrus driver was impeding S3 for CL-GD544 but allowing it for
CL-GD7548, CL-GD7555, CL-GD7556 and more.  You could expose one of these device
ids but then you might have to make additional changes in the backend to support
these device ids.

Kamala

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