Re: Corrupt VNC display for 1366x768

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Oct 02, 2024 at 11:09:13AM +0000, Simon Rowe wrote:
> I've been trying to track down the cause of a glitch that affects guest VNC consoles when the resolution is set to 1366x768. This results in a "stair case" effect where each successive row is offset to the right by a handful of pixels. I believe this is related to the fact that the horizontal resolution only divisible by 2, not 16 which most others are.
> 
> There was a similar report many years ago, with a proposed patch
> 
> https://lists.gnu.org/archive/html/qemu-devel/2013-03/msg02732.html
> 
> but this was never committed and the code has been significantly reworked in the meantime.
> 
> Could anyone give me any pointers as to where the problem may lie?

There's a newer bug report here, but not real progress:

  https://gitlab.com/qemu-project/qemu/-/issues/90

1366 is particularly problematic as it apparently can't be represented
exactly in EDID which needs a x8 multiple.

With regards,
Daniel
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