[alsa-devel] [PATCH 0/4] ALSA: hda beep clean up

Jaroslav Kysela perex at perex.cz
Tue Jul 3 22:01:45 CEST 2012

Date 3.7.2012 18:31, Jaroslav Kysela wrote:
> Date 3.7.2012 18:03, Takashi Iwai wrote:
>> Hi,
>> this is a series of small cleanups of HD-audio beep code.
>> Since the keyboard driver already handles the simultaneous outputs
>> from the multiple input beep instances, there is no merit to have
>> beep_mode=2 option to switch the beep input device.
> Acked-by: Jaroslav Kysela <perex at perex.cz>

While I acked this, I vaguely remember now, that the event duplication
(simultaneous outputs) caused some issues on some Lenovo notebooks.

When the pcspkr and HDA beep generator is connected to the same output
(integrated speakers), it may cause some issues (bad beep quality -
frequency etc.).

I looked to the input code, and the kd_mksound() calls
input_handler_for_each_handle(), thus the event is duplicated to all
beep generators, right?

The beep_mode=2 was introduced to let users to help with this issue with
a comfortable way.


Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project; Red Hat, Inc.

More information about the Alsa-devel mailing list