Video flickers when the volume is changed / when VLC window loses focus

[kepler2]

Hello!

This is my first post here. First of all thanks to all of you for the hard-work. VLC is my main video player since way long ago

I wanted to report an issue me and other people are encountering (on several Linux distros)

System Specs:

CPU: Dual Core Intel Core2 Duo E4600 (-MCP-) speed: 1740 MHz Kernel: 4.19.0-5-amd64 x86_64
Up: 9m Mem: 828.4/3000.4 MiB (27.6%) Storage: 223.57 GiB (46.1% used) Procs: 166
Shell: bash 4.4.12 inxi: 3.0.33

Graphics: Device-1: AMD Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM] driver: radeon
v: kernel
Display: x11 server: X.Org 1.19.2 driver: radeon resolution: 1680x1050~60Hz
OpenGL: renderer: AMD CAICOS (DRM 2.50.0 / 4.19.0-5-amd64 LLVM 7.0.0)
v: 3.3 Mesa 18.2.6

Audio: Device-1: Intel 82801H HD Audio driver: snd_hda_intel
Sound Server: ALSA v: k4.19.0-5-amd64

Desktop Environment: XFCE 4.12.4

VLC Version: 3.0.7.1 Vetinari

VLC Video output: Automatic

Issue: The playing video flickers whenever the volume is changed or when VLC window loses focus

Steps to reproduce:

1. Launch VLC
2. Open a video file
3. Change the system volume - observe
4. Click outside VLC window (to lose focus)
5. Click inside VLC window - observe


Video of the issue:
https://i.imgur.com/t48HLQl.mp4

NOTES:

- If the video output is set to VDPAU, the issue no longer occurs
- The issue seems to occur when VLC is using System's Default or GTK 2 skin. If i change the skin to "Plastique" for example, the issue no longer occurs.
inmgur uplo

[unidan]

Hi, can you provide verbose logs ? Do you have a compositor like compton ?

It looks like it's related to your environment, but we can check if there is something to do for this.

To help you, we need messages, to completely understand what your problems is.
To fix this, please be sure before you start the playback to:

1. Open: Tools -> Messages.
2. Set Verbosity to 2
3. Start playback to reproduce your issue
4. Save text in a file or copy into clipboard
5. Then paste the full resulting log here between [​code]and[​/code] (or use Pastebin.com if it's too long)

Also don't forget to name your Operating System and provide the VLC media player version.

[kepler2]

Hi, can you provide verbose logs ? Do you have a compositor like compton ?

It looks like it's related to your environment, but we can check if there is something to do for this.

Hello and thanks for replying!

Distro: MX Linux 18.3, but issue also occurs in Arch, Manjaro. (reproduced in XFCE)

Compositor: I use the XFWM compositor from XFCE. NOTE that the issue occurs even if i disable the compositor.

VLC LOG:

https://pastebin.com/e04s5U9q

Best regards!