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da2cecf074
Disabling dB volumes for max_dB < 0 was added in Pulseaudio in 2021,
based on a device which had -128..-127.07 range. However, negative
max_dB is valid value for USB devices, and there are devices that have
it.
Eg. Microsoft LifeChat LX-3000 has
numid=6,iface=MIXER,name='Speaker Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=151,step=0
: values=150,150
| dBminmax-min=-28.37dB,max=-0.06dB
and the dB range seems to be OK. Web search for "The decibel volume
range for element" also gives other hits with seemingly OK looking
ranges.
Don't disable dB volume unless both the max is negative and the range is
suspiciously small. This should still disable it for the device this
check was originally added for.
Link: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/447
Link:
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|---|---|---|
| .. | ||
| acp | ||
| mixer | ||
| 90-pipewire-alsa.rules | ||
| acp-tool.c | ||
| alsa-acp-device.c | ||
| alsa-compress-offload-device.c | ||
| alsa-compress-offload-sink.c | ||
| alsa-pcm-device.c | ||
| alsa-pcm-sink.c | ||
| alsa-pcm-source.c | ||
| alsa-pcm.c | ||
| alsa-pcm.h | ||
| alsa-seq-bridge.c | ||
| alsa-seq.c | ||
| alsa-seq.h | ||
| alsa-udev.c | ||
| alsa.c | ||
| alsa.h | ||
| compress-offload-api-util.c | ||
| compress-offload-api-util.h | ||
| compress-offload-api.c | ||
| compress-offload-api.h | ||
| meson.build | ||
| test-hw-params.c | ||
| test-timer.c | ||