speakup outputs alternately to soft and serial synths when both are loaded

[grnowak]

I thought I'd document this issue here. When both speakup_soft and one of the serial synthesizers such as speakup_dummy are loaded, speakup randomly sends output to both synthesizers at the same time. This issue is known to exist in speakup source in 4.17.x and 4.18.x kernels. It may be in earlier trees though as well. Steps to reproduce are given in the first of the below URLs:

http://linux-speakup.org/pipermail/speakup/2018-June/061417.html

http://linux-speakup.org/pipermail/speakup/2018-October/061481.html

http://linux-speakup.org/pipermail/speakup/2018-October/061482.html

[sthibaul]

Could somebody who has had the issue try the attached
mix.txt ?

[grnowak]

I've only had a chance to use my newly built kernel for a few minutes, but Samuel's patch does appear to fix the problem. I will do more testing in the morning, and will close this issue if this problem has gone away. This is using the patch Samuel posted to the speakup list against 4.18.x, 4.18.16 in my case.

[sthibaul]

This was submitted on https://marc.info/?l=linux-kernel&m=154032393724211&w=2