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Mute LED not working on HP EliteBook 840 G1
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fullfreelx
n00b
n00b


Joined: 24 Mar 2020
Posts: 1

PostPosted: Tue Mar 24, 2020 5:14 am    Post subject: Mute LED not working on HP EliteBook 840 G1 Reply with quote

It looks like I'm having the same problem as: https://forums.gentoo.org/viewtopic-t-1086606-start-0.html

These laptops use different sound cards, and the fix in the solved post doesn't work on my 840 G1.

I'm not sure how to correlate my sound cards here:
Code:
$ grep "Codec:" /proc/asound/card*/codec*
/proc/asound/card0/codec#0:Codec: Intel Haswell HDMI
/proc/asound/card1/codec#0:Codec: IDT 92HD91BXX

With the change to /etc/modprobe.d/alsa-base.conf:
Code:
options snd-hda-intel model=mute-led-gpio


Anyone know the correct line to use here?

[Moderator edit: added [code] tags to preserve output layout. -Hu]
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axl
l33t
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Joined: 11 Oct 2002
Posts: 923
Location: Romania

PostPosted: Tue Mar 24, 2020 8:40 pm    Post subject: Reply with quote

in linux, the led infrastructure that can be managed by the kernel, will show up in /sys/class/leds. you will see there all "leds" devices. each of them will have a "trigger" file inside it, which is a list of things the kernel can keep track of and show up as signals.

if you have a trigger, light-on-mute... you just do light-on-mute > /sys/class/leds/soundcard/trigger. i doubt it will be this easy.

But there is a trigger for none. to turn the light off. all devices have none. now... for a "always on"... not sure all devices have that. depends on the device. for instance... the PS4 controller shows up as 3 devices. one for each color in RGB. and each color has a different trigger.


You can actually innovate. But it's also a question about the kernel. You should enable most things in "led". device drivers, and in the 2nd, or 3rd page, you have led subsystem. and then... use it how you see fit.
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