Problems starting mythbackend

Hello all,

I upgraded the kernel to jessie-backports last week and I have some
problems with mythbackend service:

# /etc/init.d/mythtv-backend start
[....] Starting mythtv-backend (via systemctl):
mythtv-backend.serviceJob for mythtv-backend.service failed. See
'systemctl status mythtv-backend.service' and 'journalctl -xn' for
details.
failed!

# systemctl status mythtv-backend.service
● mythtv-backend.service - LSB: Start/Stop the MythTV server.
Loaded: loaded (/etc/init.d/mythtv-backend)
Active: failed (Result: exit-code) since Thu 2015-11-19 18:39:54 CET; 9s ago
Process: 4211 ExecStart=/etc/init.d/mythtv-backend start
(code=exited, status=136)

Nov 19 18:39:54 backend mythtv-backend[4211]: Starting MythTV server:
mythbackend Could not open pid file:
Nov 19 18:39:54 backend mythtv-backend[4211]: eno: Permission denied (13)
Nov 19 18:39:54 backend systemd[1]: mythtv-backend.service: control
process exited, code=exited status=136
Nov 19 18:39:54 backend systemd[1]: Failed to start LSB: Start/Stop
the MythTV server..
Nov 19 18:39:54 backend systemd[1]: Unit mythtv-backend.service
entered failed state.

This is the PID file folder permissions:

# ls -lha /var/run/mythtv/
total 0
drw-r-xr-x 2 mythtv root 40 Nov 19 08:17 .
drwxr-xr-x 25 root root 880 Nov 19 08:17 ..

Need I change something?

Best regards.

--
Josu Lazkano