Re: Syncing the guest display resolution with the host in fullscreen

[Thomas Huth]

On 06/07/2024 00.46, Anton Shepelev wrote:
> Thomas Huth:
>
> > I had a quick look, but if I got this right, 1366x768 is
> > not a mode that fits into the standard EDID information,
> > since 1366 is not dividable by 8.
>
> Thank you very much Thomas.  That also explains why get-
> edid(1) does not work on this laptop.
>
> > See also
> > https://en.wikipedia.org/wiki/Extended_Display_Identification_Data#Limitations
> > for some more information.
>
> It says:
>
>     For 1366x768 pixel Wide XGA panels the nearest resolution
>     expressible in the EDID standard timing descriptor syntax
>     is 1360x765 pixels, typically leading to 3 pixel thin
>     black bars.
>
> I can live with 3-pixel black bars, if QEMU will only enter
> a corresponding full-screen mode.  What I cannot live with,
> is a scaled image with intepolative blur or other artefacts.

QEMU already enables 1360x768 in the EDID information, see:


https://gitlab.com/qemu-project/qemu/-/blob/master/hw/display/edid-generate.c#L18

... but I've got no clue why guests don't offer that screen resolution ... I 
still assume this resolution is something special that the driver in the 
guest has to support explicitly.

 Thomas