Problems with Sound on RPi 2 & 3 under Ubuntu MATE

Support & Help Requests Raspberry Pi
#1

When selecting Sound Preferences > Hardware > Test Speakers, the
expected response: Front Left and Front Right is invariably incomplete
or is not reproduced at all.

Other applications attempting to use the built-in sound system
demonstrate the same broken or intermittent behaviour.

Note: this is using sound output from a Raspberry Pi 2 or 3 via HDMI
and a monitor with built-in speakers. Since the monitor works properly
with sound over HDMI via a laptop running Ubuntu (64 bit), it is
presumed that the Ubuntu MATE (16.04 Beta 2) implementation on the
armhf for Raspberry Pi 2 & 3 is at fault.

I have set (ie uncommented) hdmi_drive=2 in the Config.txt file (as advised by Martin Wimpress) but this shows no improvement.

(What I am attempting to do is to run Gqrx (a software defined radio) on the Raspberry Pi 3. If this works, the use of a radio frequency dongle (eg FUNCube dongle Pro +) would make the RPi into a high specification radio communications receiver. Gqrx runs beautifully on a MacBook Pro under OS X. It is also capable of running under Ubuntu 15.10 on a Dell XPS13 laptop. Its functionality on a RPi would certainly reduce the total hardware costs and be a significant achievement for the RPi and its UbuntuMATE implementation.)

#2

I hope this helps?:

https://groups.google.com/forum/#!msg/gqrx/Az1zH4VRd5w/xQVOAhtn_30J

http://www.rs-online.com/designspark/electronics/eng/blog/taking-the-raspberry-pi-2-for-a-test-drive-with-gnu-radio-2

#3

This bug has also been reported via Ubuntu’s bug reporting system. The bug has been raised to Status: Confirmed, Importance: Medium.

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#4

Just out of curiosity, not to be impatient:

How and when will this problem be resolved? I’m not familiar with the bug-reports and subsequent steps.

#5

My sound on Raspberry Pi 3 did not work on VLC after fresh install of 16.04. My HDMI cable goes to a TV.

Run this command and edit the file as follows:
$ sudo nano /boot/config.txt

# hdmi_group=2 sets to DMT 
hdmi_group=2

# hdmi_drive=2 sets to normal HDMI with sound
hdmi_drive=2

# config_hdmi_boost=5 boosts signal. Can go as high as 9
config_hdmi_boost=5
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