For those affected by this who want or need speech-dispatcher, another
workaround may be to disable timer-based scheduling for PulseAudio.
For most, this can be done by locating the following line in your
default.pa file:
load-module module-udev-detect
...and replacing it with this:
load-module module-udev-detect tsched=0
(Note: default.pa is usually "/etc/pulse/default.pa", or
"~/.config/pulse/default.pa" if you have a local configuration)
This works well on my current system so far. Though, most of my machines
over the past few years have been affected by this bug, and I'm not sure
if it's quite worked for all of them.
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https://bugs.launchpad.net/bugs/1736222
Title:
speech-dispatcher distorts all sound
Status in speech-dispatcher package in Ubuntu:
Confirmed
Bug description:
So, a brand new computer running Ubuntu 16.04.3 LTS.
In hardinfo summary, my audio adapters are
• HDA-Intel - HDA Intel HDMI
• HDA-Intel - HDA Intel PCH
• HDA-Intel - HDA NVidia
In detail: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio
Controller (rev 06)
Memory 16kb (non-prefetchable), snd_hda_intel
As soon as I load a website in Firefox that utilizes speech-dispatcher
(fimfiction.net) all sounds get distorted, whether I click a paragraph
for TTS reading or not. The problem seems to go away if I don't use
the site after a while. When I close down Firefox the problem still
lingers a bit, but maybe not as long. One thing I did which seemed
faster was close down everything, then load what I wanted to listen to
(Skype, Discord), and if it still persisted I would go into "Sound
Settings" and after a few blinks in that window the sound is normal
again.
While the site is open, according to "Sound Settings" (from the
speaker icon menu) and Pulse Audio Volume Controller (pavu) there are
4 copies of this package. Muting them did not help the problem, but
moving one of them, and a very specific one, from the "Built-in Audio
Analog Stereo" to something else like HDA NVidia (HDMI 3) seems to be
a workaround.
Just so you know, I do not use the HDMI cable for sound, but instead
use the "headphones" jack. If you need any more details, I'll try to
provide them.
/Edward
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