[ltp] X41 high pitched noise

[Tino Keitel]

On Sun, Jul 03, 2005 at 23:53:00 +0200, Till Maas wrote:
> Hi,
> 
> I just got a X41 and found a strange problem. In the archive of this 
> mailinglist I found other haven a similar problem with a T41 but they didn't 
> have a soulution.
> 
> So, here's my problem. When I boot Linux with acpi support I hear some 
> annoying high pitched noise through a speaker but not through earphones. 
> Booting with acpi=off kernel option make the noise go away and it seems it 
> starts when acpi modules are loaded. Another way to get rid of the noise is 
> to play some sound even with the soundcard muted. dd to or from /dev/dsp 
> with /dev/zero resp. /dev/null shuts the sound down as well.
> 
> Has anyone any suggestions how I could get rid of the sound in a more 
> convinient way, maybe fixing it in acpi or alsa.

Maybe it helps to set HZ to 100 in the kernel source by changing
<kernel-source>/include/asm/param.h like this:

#define HZ 100

After changing this, recompile your kernel and reboot.

Regards,
Tino