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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: Tue, 18 Dec 2018 14:11:35 +0100 (CET)
User-agent: Alpine 2.21.9999 (BSF 287 2018-06-16)

On Tue, 18 Dec 2018, Daniel P. Berrangé wrote:
On Tue, Dec 18, 2018 at 10:54:06AM +0000, Mark Cave-Ayland wrote:
On 17/12/2018 14:56, BALATON Zoltan wrote:

I still have this problem after updating everything on my machine, latest QEMU 
SDL 2.0.9 so it's not likely to be a bug in some external component. If I just 
qemu-system-ppc (compiled with --disable-gtk) and try to open monitor console 
Ctrl-Alt-2 I see QEMU monitor but when I type in this window the serial output 
contents flash in this window. At the same time the window that opens for 
which should have the serial output is empty. It looks like an index may be off
somewhere or window contents are not associated with the right window but I 
have no
idea where to look for it. Can you reproduce it now and do you have any idea 
could cause this?

Are you using Fedora Core 29 at all? I know Howard has been experiencing redraw
issues since upgrading from FC 28 to FC 29. A couple of other things to check:

There is no "Fedora Core" since Fedora Core 6, just Fedora :-P

But seriously, I teted on Fedora 29 and didn't see any problem, so there
must be some more specific scenario that is hurting it.

1) Does QEMU 3.0 work correctly? If so, a bisection would help.
2) Are you using an Nvidia graphics card with the nouveau driver?

This second point is a good idea to consider.

How is graphics card relevant for this? I do use NVidia but not nouveau but vendor drivers (version 390.87) on Mageia 6 (which is a bit like Fedora but may have differences). I have this problem for a while so I don't think it's a recent regression. It only seems to affect qemu-system-ppc, qemu-system-x86_64 does open serial console all right but could be I was using different configure options for these.

With qemu-system-ppc when I press Ctrl-Alt-3 an empty window opens and the content that should be in this window appears in the monitor window that opens for Ctrl-Alt-2 but behind the normal monitor output, only visible when I type in that window. My configure options are:

./configure --disable-gtk --disable-tpm \
--audio-drv-list=alsa \
--target-list=ppc-softmmu \
--disable-libssh2 --disable-libusb --disable-guest-agent \

Parallel console for Ctrl-Alt-4 seems to work all right but that has no content. I'm not sure if it's relevant to have output in the serial window. For qemu-system-ppc OpenBIOS has some serial output. Now that I've tried it does seem to be relevant: if I press Ctrl-Alt-3 right after QEMU starts when the main screen still says "guest has not initialised" then it works but if I wait until OpenBIOS starts with yellow screen (and some output on serial) and then press Ctrl-Alt-3 then empty window opens so maybe it's related to have some content on serial when window first opens?


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