qxl-vga.vgamem_mb and large monitors

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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>

This is a Centos 7.1 host and Fedora 22 guest

However, I just got a qemu-kvm update from the ovirt repository to version qemu-kvm-ev-2.1.2-23.el7_1.3.1.x86_64, from the previous version qemu-kvm-rhev-1.5.3-86.el7.1.x86_64, and now I get this error in Xorg.log:

[ 321.154] (EE) qxl(0): failed to set mode: Invalid argument(II) qxl(0): Allocate new frame buffer 3840x1200 stride
[   332.363] (EE) qxl(0): failed to set mode: Invalid argument

Whereas at slightly lower resolution:

[   309.808] (II) qxl(0): Allocate new frame buffer 3840x1080 stride

Works fine.  Now:

3840 x 1080 x 4 = 16588800 < 16 * 1024 * 1024 = 16777216

but

3840 x 1200 x 4 = 18432000 > 16 * 1024 * 1024 = 16777216

So my conclusion is that the command line argument isn't working anymore and the 16MB default is back in place.

Has qemu/libvirt changed somehow making this old syntax invalid?

--
Thanks,
David Mansfield
Cobite, INC.


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