[Spice-devel] qxl-vga.vgamem_mb and large monitors

[David Mansfield]

On 06/19/2015 02:22 PM, David Mansfield wrote:
> Hi All,
>
> We (4 of us in my company) have been very happy with spice over the 
> last year or so running with dual 1920x1200 monitors, for which 
> qxl-vga.vgamem_mb always needed to be set to 32 (default is 16) or 
> Xorg-qxl doesn't get enough video ram.  I even bumped it to 64MB and 
> we can run a 3940x2160 and a 1920x1200 just fine.
>
> This is set it libvirt domain xml like this:
>
>  <qemu:commandline>
>     <qemu:arg value='-global'/>
>     <qemu:arg value='qxl-vga.vgamem_mb=32'/>
>   </qemu:commandline>
>
...
> Has qemu/libvirt changed somehow making this old syntax invalid?
>

Argh.  Reply to self.

It HAS been added to the domain XML (and old syntax seems overruled).  
There's the "vgamem" attribute, as in:

<video><model type='qxl' ram='131072' vram='131072' vgamem='32768' 
heads='1' /></video>

It's kinda mis-documented in the libvirt domain XML:

"There is also optional attribute |vgamem| (since 1.2.11 (QEMU only)) to 
set the size of VGA framebuffer for fallback mode of QXL device."

Vgamem is needed even in non-fallback mode to support a large (3840x1200 
or larger)  framebuffer.

Thanks,
David

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