Package: xserver-xorg
Version: 1:7.7+7
Severity: important

The workstation has an NVIDIA K2200 connected to a Benq display with
built-in speakers.  Connection is from the DisplayPort socket on the GPU
to the mini-DisplayPort on the monitor.

It is a GNOME 3 desktop

Looking in the sound preferences, it shows up as "HDMI / DisplayPort 3 -
HDA NVidia"

After booting up, audio works fine through this device.

After locking the screen and unlocking it, nothing can be heard.
Stopping and starting the sound application doesn't make any difference.
 The device is still visible in the Sound settings control panel.
Clicking to "Test Speakers" there, it pauses while it tries to make a
sound, but nothing is heard.

Unplugging the cable from the monitor and attaching it again gets it
working again.

The NVIDIA proprietary driver is in use, version 352.41

Some extracts from /var/log/Xorg.0.log, please tell me if more detail is

[   131.965]
X.Org X Server 1.16.4
Release Date: 2014-12-20
[   131.965] X Protocol Version 11, Revision 0
[   131.965] Build Operating System: Linux 3.16.0-4-amd64 x86_64 Debian
[   131.965] Current Operating System: Linux host1 3.16.0-4-amd64 #1 SMP
Debian 3.16.36-1+deb8u1 (2016-09-03) x86_64
[   131.965] Kernel command line: BOOT_IMAGE=/vmlinuz-3.16.0-4-amd64
root=/dev/mapper/vg01-root ro quiet
[   131.965] Build Date: 11 February 2015  12:32:02AM
[   131.965] xorg-server 2:1.16.4-1 (
[   131.965] Current version of pixman: 0.32.6

[   135.899] (II) Loading /usr/lib/xorg/modules/drivers/
[   136.056] (II) Module nvidia: vendor="NVIDIA Corporation"
[   136.056]    compiled for 4.0.2, module version = 1.0.0
[   136.056]    Module class: X.Org Video Driver
[   136.060] (II) NVIDIA dlloader X Driver  352.41  Fri Aug 21 22:14:01
PDT 2015
[   136.060] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs

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