Bug#1023580: A recent Bookworm upgrade broke video playback in the VLC player

[Alexis Murzeau <amubtdx@gmail.com>]

Hi,

On 09/11/2022 14:00, Lisandro Damián Nicanor Pérez Meyer wrote:
> tag 1023580 unreproducible moreinfo
> thanks
>
> Hi!

> First of all thanks for the detailed reproduction steps. I don't seem
> able to reproduce the bug on my machine, so something else must be
> playing its part here. Are you running on Wayland or X? Which video
> card do you have? Are you using the FLOSS drivers for it? If you can
> think of any other detail that might be related here, please do not
> hesitate in adding it.
>
> Kinds regards, Lisandro.


I'm running on X and reproduced it with:
 - AMD Radeon RX 580 GPU (with xserver-xorg-video-amdgpu driver)
 - Intel HD Graphics 4000 (ivy bridge) (with xserver-xorg-video-intel driver)
 - VirtualBox VM with xserver-xorg-video-vmware and xserver-xorg-video-vesa drivers

I'm not running non-free or contrib driver on any of these hardware (except firmware-amd-graphics with AMD GPU and microcode firmwares (intel and amd physical machines)).
On the virtualbox VM, I'm not running anything outside main.

I'm not on the PC that has the VM right now, but will be next week.
The VM is containing these packages:
 - Debian Unstable without any tasks (nothing selected on Debian Installer)
 - xserver-xorg
 - vlc
 - icewm and fluxbox (or anything you like to have an X environment)
 - xinit (for startx)
 - You might be required to put your user in the `input` group
   (else the mouse and keyboard might not work)
 - Run startx, then run vlc with a video
    - Play the video
    - Stop the video
    - Open the playlist (CTRL + L)
    - Play the video again, stop it again
    - Resize the VLC window (while the playlist is open)

This reproduce the issue for me with VirtualBox.
I think the emulated GPU controller is "VMSVGA", I will be able to
confirm this next week, but I've not installed guest additions.

I've tried to create a minimal Qt sample application that would reproduce the issue, but I can't get it.
Maybe there is something related with a specific feature or configuration.

--
Alexis Murzeau
PGP: B7E6 0EBB 9293 7B06 BDBC  2787 E7BD 1904 F480 937F