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[Xen-users] VM Resolution

I don't know whether this can be done anymore.  There are lots of instructions 
out there for increasing the resolution for a VM, to higher than 1280x768.  
These generally boil down to 
       vga        = "stdvga"
       videoram   = 16

Unfortunately these do not work in Xen 4.5, even with
       device_model_version = 'qemu-xen-traditional'
In fact, when I set to qemu-xen-traditional, my resolution goes down to an 
abysmal 1024x768.

Is there a new procedure? 

CentOS 7 in dom0 and domU.

Here is my .cfg, in case I'm doing something else wrong:

Name = "hex"
        builder = 'hvm'
        bootloader = 'pygrub'
# Required for VGA passthrough
        device_model_version = 'qemu-xen-traditional'

# Enable PVHVM

# Start the guest with MBYTES megabytes of RAM.
        memory = 1024
# Keep time in domU, from dom0

#  Disk device(s). Using LVM
        disk = [
#               'phy:/dev/sr0,hdc:cdrom,r'
        # hard disk (c), cd-rom (d) or network/PXE (n).

# Peripherals
        vif = ['mac=00:16:5e:02:a3:53, bridge=prometheus-br, model=e1000']
        pci = [ '00:1a.0','00:1b.0','00:1d.0','05:00.0' ]
#       gfx_passthru=1
# USB devices:
        usbdevice = [
        vga        = "stdvga"
        videoram   = 16

#  Behaviour
        on_poweroff = 'destroy'
        on_reboot   = 'restart'
        on_crash    = 'restart'

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