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Re: [Qemu-devel] Monitor and serial output window broken with SDL2

From: BALATON Zoltan
Subject: Re: [Qemu-devel] Monitor and serial output window broken with SDL2
Date: Thu, 20 Dec 2018 12:18:51 +0100 (CET)
User-agent: Alpine 2.21.9999 (BSF 287 2018-06-16)

On Thu, 20 Dec 2018, Gerd Hoffmann wrote:
On Wed, Dec 19, 2018 at 07:11:34PM +0100, BALATON Zoltan wrote:
On Wed, 19 Dec 2018, Daniel P. Berrangé wrote:
On Tue, Dec 18, 2018 at 08:05:59PM +0100, BALATON Zoltan wrote:
On Tue, 18 Dec 2018, Daniel P. Berrangé wrote:
I don't see any difference depending on whether I use Ctrl-Alt-3 before
or after the yellow screen - both work as expected. The fact that you
see a difference though does suggest that there's something odd being
done in the ppc emulation that is in turn doing something bad to SDLs
rendering with your graphics setup. I don't know what it could be though.

OK thanks for checking this, at least it seems this is something that not
reproduces elsewhere so it's probably something specific to my setup. I may
try to debug this further when I'll have time.

I think there's a good chance that this is still a bug in QEMU, so
definitely still worth trying to debug what in your setup triggers

Looks like Howard (cc'd) also has similar issue on Fedora 29 with NVidia
vendor driver although newer version than mine so the proprietary NVidia
driver seems to be a common point here. The difference is that for him the
monitor window seems to hijack the guest screen not the serial screen like
for me but this could be the same bug. I can't easily test with nouveau
driver now so that's all we could find out so far. Also having some output
on serial window seems to be relevant as this works before client starts if
I start with qemu-system-ppc -S but breaks after continue in monitor window.
qemu-system-x86_64 also does not show the problem but maybe because there's
no content in serial window there?

qemu-system-x86_64 -machine graphics=off will make seabios print stuff
to the serial line.

And with that it also shows the same problem so looks like this happens when something is output to serial and maybe with the NVidia vendor drivers on SDL2. I can't debug this more at the moment.


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