Re: qxl-vga.vgamem_mb and large monitors

David Mansfield <spice@xxxxxxxxxxxxx> · Fri, 19 Jun 2015 15:48:18 -0400



    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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