Audio not working

[pade]

Hi,

I hve notice some audio trouble on a particular configuration.
My system is the following:
Linux kernel 4.6.0-1-amd64 #1 SMP Debian x86_64
QLC 4.10.4
Qt: 5.5.1
Sound chipset: Intel HDA (module snd_hda_codec)

With QLC, I have no sound on speaker. The chipset is Intel HDA. I observe the same behavior on 2 laptop with the same chipset.
The sound is OK on HDMI or with an USB sound adapter.
When I launch QLC, then i cannot also have sound with other audio application (VLC, mplayer).

I had remark that:
- If I launch Kdenlive before QLC, then QLC works fine (no sound problem).
- If I launch Kdenlive, then QLC, then I close Kdenlive, QLC works fine.
- If I launch QLC then kdenlive, Kdenlive isn't able to open a projet (It is blocked during project loading).

I understand that it is a very specific problem, very difficult to debug without the same configuration, and I would like to know if I'm the only user with such a configuration to have this problem.

Thanks

Pade