[alsa-devel] PC Beeps not working with HDA Intel module

[Takashi Iwai]

At Sat, 26 Jun 2010 13:25:04 +0200,
Shérab wrote:
> 
> Dear all,
> 
> The problem is on a computer with an HDA Intel sound card, Intel G45
> DEVCTG chip and appears will all version s of the kernel.
> 
> Running e.g.
> beep 440
> produces a beep whose audible frequency is very low, definitely not 440
> Hz.
> 
> However, it is worth notiing that grub is able to produce a beep of the
> right frequency at boot time.
> 
> Can this problem be fixed ?

There are a few ways.

If you build your kernel with SND_HDA_INPUT_BEEP_MODE=2, or set the
option of snd-hda-intel module beep_mode=2, you'll be able to switch
to the native beep from HD-audio codec digital beep via muting "Beep"
mixer switch.

Or, if the value above is 0, it'll be always the system-native beep.
This can be done also via writing sysfs codec hint, as documented in
HD-Audio.txt.

Alternatively, you can reload pcspkr module so that it grabs the beep
output again over snd-hda-intel, "modprobe -r pcspkr; modprobe pcspkr"


Takashi