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

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] Monitor and serial output window broken with SDL2
Date: Thu, 20 Dec 2018 06:42:38 +0100
User-agent: NeoMutt/20180716

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
> > it.
> 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.


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