qvm-run fails with audio devices attached / audio broken

[taonik]

Qubes OS version (e.g., R3.2):

Qubes R4.0 rc1

Affected TemplateVMs:

dom0 + fedora-25 / debian-8

---

Expected behavior:

Designed AppVM should start normally and it does it with no audio devices attached.

Actual behavior:

1. Audio devices pre-attached

[user@dom0 ~]$ qvm-pci
BACKEND:DEVID  DESCRIPTION
...
dom0:00_03.0       Audio Device: Intel Corporation Haswell-ULT HD Audio Controller
                                           audiovideo
dom0:00_1b.0       Audio Device: Intel Corporation 8 Series HD Audio Controller
                                           audiovideo
...
[user@dom0 ~]$ qvm-run audiovideo
audiovideo: Start failed: internal error: libxenlight failed to create new domain 'audiovideo'

2. Attach the audio devices after the VM is started

[user@dom0 ~]$ qvm-pci
BACKEND:DEVID  DESCRIPTION
...
dom0:00_03.0       Audio Device: Intel Corporation Haswell-ULT HD Audio Controller
dom0:00_1b.0       Audio Device: Intel Corporation 8 Series HD Audio Controller
...

[user@dom0 ~]$ qvm-run audiovideo
[user@dom0 ~]$ qvm-pci attach audiovideo dom0:00_03.0
Got empty response from qubesd
[user@dom0 ~]$ qvm-pci attach audiovideo dom0:00_1b.0
Got empty response from qubesd

Steps to reproduce the behavior:

1. Attach the audio devices from Qubes Menu -> (audiovideo) -> (audiovideo) VM Settings -> Devices and then start the AppVM.
2. Start the AppVM and then try to attach the audio devices.

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General notes:

My laptop is almost new and with Qubes R3.2 the sound worked fine and I had never encountered problems like these ones.
Now I can't use audio at all.