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[Bug 1882851] Re: [PATCH 1/2] drm/virtio: fix unblank
From: |
Gerd Hoffmann |
Subject: |
[Bug 1882851] Re: [PATCH 1/2] drm/virtio: fix unblank |
Date: |
Fri, 28 Aug 2020 11:27:59 -0000 |
On Mon, Aug 24, 2020 at 09:24:40AM +0200, Jiri Slaby wrote:
> On 18. 08. 20, 9:25, Gerd Hoffmann wrote:
> > When going through a disable/enable cycle without changing the
> > framebuffer the optimization added by commit 3954ff10e06e ("drm/virtio:
> > skip set_scanout if framebuffer didn't change") causes the screen stay
> > blank. Add a bool to force an update to fix that.
> >
> > v2: use drm_atomic_crtc_needs_modeset() (Daniel).
> >
> > Cc: 1882851@bugs.launchpad.net
> > Fixes: 3954ff10e06e ("drm/virtio: skip set_scanout if framebuffer didn't
> > change")
> > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>
> Tested-by: Jiri Slaby <jirislaby@kernel.org>
Ping. Need an ack or an review to merge this.
thanks,
Gerd
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https://bugs.launchpad.net/bugs/1882851
Title:
QEMU video freezes with "Guest disabled display" (virtio driver)
Status in QEMU:
New
Bug description:
I am using Arch Linux as my Guest and Host OS, after starting qemu
with the following command:
$ qemu-system-x86_64 -enable-kvm -hda arch-zoom.qcow2 -m 4G -vga
virtio
and waiting for a screen blank, I get this message:
Guest disabled display
And nothing happens after that, I can move the mouse or hit any key,
and the message is still there.
I can still reboot the VM but that's not optimal.
I can reproduce this with the latest QEMU release (5.0.0) or git master,
I also tried this with older releases (4.0.0, 3.0.0) and the issue is still
there.
I can't reproduce this with other video drivers (std, qxl).
With std/qxl the screen will blank a bit and then continue as normal.
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