[pve-devel] applied: [PATCH qemu-server] cfg2cmd: vga: fix #2749: disable edid for Win+BIOS+VGA machines

Thomas Lamprecht t.lamprecht at proxmox.com
Wed Aug 19 19:35:23 CEST 2020


On 27.07.20 15:55, Aaron Lauterer wrote:
> Edid support was added with Qemu 5. Windows guests seem to not be able
> to get all possible resolutions if the default std VGA device is used as
> GPU and the VM boots in BIOS mode. The result is that only one of the
> following three resolutions can be configured:
> 
> 800x600
> 1024x768
> 1920x1080
> 
> It is important to note that just booting a Windows VM with the edid=off
> parameter will not make the large list of resolutions available. It
> seems that Windows is caching the list of possible resolutions
> somewhere [0].
> 
> Uninstalling the 'Microsoft Basic Display Adapter' in the device manager
> and rebooting the VM is one way I found to force Windows to recreate the
> list of possible resolutions.
> 
> Signed-off-by: Aaron Lauterer <a.lauterer at proxmox.com>
> 
> [0] https://lists.nongnu.org/archive/html/qemu-devel/2020-07/msg07128.html
> ---
> 
> I did test live migration in both directions and it does seem to work.
> Would be great if someone else could verify this as well. Not having to
> version guard this would be nice.
> 
>  PVE/QemuServer.pm                                     | 7 ++++++-
>  test/cfg2cmd/custom-cpu-model-host-phys-bits.conf.cmd | 2 +-
>  test/cfg2cmd/custom-cpu-model.conf.cmd                | 2 +-
>  3 files changed, 8 insertions(+), 3 deletions(-)
> 
>

applied, thanks! Tested a bit around with migrations and changing screen
resolutions and such in-between, worked so far OK.




More information about the pve-devel mailing list