On Friday, July 26, 2019 at 1:24:57 PM UTC-4, Claudia wrote:
> Just to humor myself, I was going to try testing if I could hear sound
> from Qubes after resume, but it seems audio isn't working at all. Which
> is a whole 'nother problem. Aplay says "... unable to open slave; audio
> open error: no such file or directory." `echo -e '\a'` doesn't work even
> on a TTY (lsmod shows pcspkr), and `beep` isn't installed.
>
Notably, Xen does not pass the real PC speaker device to dom0 and while it
simulates it for dom0, it does not actually invoke the hardware. Something
something considered dangerous to expose adjacent-to-speaker hardware in
dom0, apparently.
So terminal beeps, etc. do nothing (except maybe flash the terminal window,
depending on your config).
I use a snippet I got from google:
function create_beep () {
# create our beep file as xen does not expose the real "bell" device w/i
n the Qubes configuration and a simple echo "\007" does not work.
> /tmp/sinewave.wav
printf "\x52\x49\x46\x46\x64\x1F\x00\x00\x57\x41\x56\x45\x66\x6D\x74\x20
\x10\x00\x00\x00\x01\x00\x01\x00\x40\x1F\x00\x00\x40\x1F\x00\x00\x01\x00\x08\x00
\x64\x61\x74\x61\x40\x1F\x00\x00" >> /tmp/sinewave.wav
for n in {0..999}
do
printf "\x80\x26\x00\x26\x7F\xD9\xFF\xD9" >> /tmp/sinewave.wav
done
}
And then invoke the following when I need a beep (probably should be made a
function) in scripts dom0:
aplay -q /tmp/sinewave.wav --duration=1
Brendan
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