Re: Possible regression with VGA and resolutions in Windows 10?

[Laszlo Ersek]

On 07/23/20 16:24, Aaron Lauterer wrote:
> Hi all,
> 
> I think we have a regression introduced in commit 0221d73ce6.
> 
> Once I start a Windows 10 VM (build 18363) with `-device VGA` I have
> only the following resolutions to choose from instead of the much longer
> list:
> 
> 1920x1080
> 1024x768
> 800x600
> 
> Linux guests work fine.
> 
> qemu-system-x86_64 \
>   -name windows-resolution-test \
>   -smp '2,sockets=1,cores=2,maxcpus=2' \
>   -nodefaults \
>   -cpu host,+kvm_pv_eoi,+kvm_pv_unhalt \
>   -m 3072 \
>   -device 'piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2' \
>   -device 'usb-tablet,id=tablet,bus=uhci.0,port=1' \
>   -device 'VGA,id=vga,vgamem_mb=32,bus=pci.0,addr=0x2' \
>   -device 'virtio-scsi-pci,id=scsihw0,bus=pci.0,addr=0x5' \
>   -drive
> 'file=/dev/zvol/rpool/data/vm-102-disk-0,if=none,id=drive-scsi0,discard=on,format=raw,cache=none,aio=native,detect-zeroes=unmap'
> \
>   -device
> 'scsi-hd,bus=scsihw0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,rotation_rate=1,bootindex=100'
> \
>   -machine pc,accel=kvm
> 
> 
> I have not yet gotten around to bisect the SeaBIOS repository to know
> exactly which commit there is causing it.
> 
> If this is better handled at the SeaBIOS mailing list, let me know.

I'm vaguely reminded of
<http://mid.mail-archive.com/20200625091709.8550-1-kraxel@redhat.com>,
but no promises.

Laszlo