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>Noise Reduction</TITLE
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CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="mobile-guide-p5c1s8-noise-reduction"
></A
>15.11. Noise Reduction</H1
><P
>&#13; Due to the proliferation of cellular phones and walkmans it's not quite
common in our days to take care of a quiet environment. Anyway I want to
give some recommendations for the polite ones.
</P
><P
>&#13; Computer noises are caused by hardware (fan, optical drive, hard disk)
and applications.
</P
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN4489"
></A
>15.11.1. Console (Shell) and X11</H2
><P
>&#13; The beeping of X11 windows can be
configured to a shorter and lower pitched tone or even to a
blunt "thump" with <B
CLASS="command"
>xset b ...</B
> options (a lower pitched tone
is usually less annoying and distracting). Independently of
that, most xterm-compatible windows and shells can be
configured to make "visual bell" instead of "audio bell".
For the console <B
CLASS="command"
>setterm -blength 0</B
> and for X11
<B
CLASS="command"
>xset b off</B
> turns the bell off. See also the
<A
HREF="http://pcmcia-cs.sourceforge.net/ftp/doc/PCMCIA-HOWTO.html"
TARGET="_top"
><SPAN
CLASS="acronym"
>PCMCIA</SPAN
>-HOWTO</A
>
and much more details in the
<A
HREF="http://tldp.org/HOWTO/Visual-Bell.html"
TARGET="_top"
>Visible-Bell-Howto</A
>.
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN4498"
></A
>15.11.2. <SPAN
CLASS="acronym"
>PCMCIA</SPAN
></H2
><P
>&#13; When starting your laptop with <SPAN
CLASS="acronym"
>PCMCIA</SPAN
>-CS
configured correctly, this will be shown by two high beeps. If you
want to avoid this put <B
CLASS="command"
>CARDMGR_OPTS="-q"</B
> into the
<SPAN
CLASS="acronym"
>PCMCIA</SPAN
> configuration file, e.g.
<TT
CLASS="filename"
>/etc/default/pcmcia</TT
> for Debian/GNU Linux.
</P
><P
>&#13; To avoid the dialtones during the modem dialing add
</P
><P
>&#13;
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;module "serial_cs" opts "do_sound=0"
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
>&#13; to <TT
CLASS="filename"
>/etc/pcmcia/config.opts</TT
> (from <B
CLASS="command"
>man
serial_cs</B
>). This will disable speaker output completely,
but the <B
CLASS="command"
>AT M</B
> command should let you selectively
control when the speaker is active, e.g. <B
CLASS="command"
>AT M0</B
>
turns off the modem's speaker.
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN4514"
></A
>15.11.3. <SPAN
CLASS="acronym"
>USB</SPAN
></H2
><P
>&#13; <B
CLASS="command"
>usbmgr</B
> configuration file <TT
CLASS="filename"
>/etc/usbmgr.conf</TT
>.
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;### BEEP
# beep off
# beep on
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN4521"
></A
>15.11.4. Hotplug</H2
><P
>&#13; Add an entry into the configuration file <TT
CLASS="filename"
>/etc/sysconfig/hotplug</TT
>.
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;HOTPLUG_BEEP="no"
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN4526"
></A
>15.11.5. Fan</H2
><DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="../images/warning.gif"
HSPACE="5"
ALT="Warning"></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>&#13; Please make sure what you are doing, when configuring the fan. Your
laptop may overheat and die, in case you have done something wrong.
Just in case you want to check the fan try to cause a heavy
CPU load, for example by issueing <B
CLASS="command"
>md5sum /dev/urandom</B
>.
Now <B
CLASS="command"
>top</B
> will show an increased CPU load and
the fan should began to run eventually. Note: usually you need
to have been connected to power, otherwise the CPU might reduce
load by itself. Also watch for the CPU temperature
<B
CLASS="command"
>acpi -bt</B
> or
<B
CLASS="command"
>cat /proc/acpi/thermal_zone/*</B
>.
</P
></TD
></TR
></TABLE
></DIV
><P
>&#13; For some laptop series there are
Linux utilities available to control the fan and other
features.
</P
><P
>&#13;
<P
></P
><UL
><LI
><P
>&#13; <A
HREF="http://www.buzzard.me.uk/toshiba/index.html"
TARGET="_top"
>Toshutils</A
>
by Jonathan Buzzard for some Toshiba models.
</P
></LI
><LI
><P
>&#13; <A
HREF="http://tpctl.sourceforge.net"
TARGET="_top"
>tpctl</A
>
IBM ThinkPad configuration tools for Linux by Thomas Hood.
</P
></LI
><LI
><P
>&#13; <A
HREF="http://people.debian.org/~dz/i8k/"
TARGET="_top"
>i8k</A
>
utils for DELL laptops.
</P
></LI
></UL
>
</P
><DIV
CLASS="sect3"
><H3
CLASS="sect3"
><A
NAME="AEN4546"
></A
>15.11.5.1. Known Problems</H3
><P
>&#13; With some laptops the fan is always on or at least very often. Here
are some remedies.
</P
><DIV
CLASS="sect4"
><H4
CLASS="sect4"
><A
NAME="AEN4549"
></A
>15.11.5.1.1. Reduction of CPU Frequency</H4
><P
>&#13; In some cases the fan is always on because the CPU is working with
highest frequency. You may use either
<A
HREF="http://sourceforge.net/projects/cpufreqd"
TARGET="_top"
>cpufreqd</A
>
or
<A
HREF="http://mnm.uib.es/~gallir/cpudyn/"
TARGET="_top"
>cpudyn</A
>
to cure this.
</P
></DIV
><DIV
CLASS="sect4"
><H4
CLASS="sect4"
><A
NAME="AEN4554"
></A
>15.11.5.1.2. IRQ Problems with ParPort Module</H4
><P
>&#13; Sometimes the <TT
CLASS="filename"
>parport</TT
> causes the fan to be
always on. You may edit the <TT
CLASS="filename"
>/etc/modules.conf</TT
>
to cure this:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13; alias parport_lowlevel parport_pc
options parport_pc io=378 irq=7
</PRE
></FONT
></TD
></TR
></TABLE
>
The IO address and the IRQ number depend on the hardware settings
or the BIOS configuration. Often the IRQ does not need to be given.
The problem and its solution was discussed in the
<A
HREF="http://lists.opensuse.org/opensuse-mobile-de/2002-11/msg00174.html"
TARGET="_top"
>SuSE Laptop Mailing List (in German)</A
>.
</P
></DIV
><DIV
CLASS="sect4"
><H4
CLASS="sect4"
><A
NAME="AEN4561"
></A
>15.11.5.1.3. ACPI</H4
><P
>&#13; Sometimes a setting in the <TT
CLASS="filename"
>/proc/acpi/</TT
> might
also help.
</P
></DIV
><DIV
CLASS="sect4"
><H4
CLASS="sect4"
><A
NAME="AEN4565"
></A
>15.11.5.1.4. Miscellaneous</H4
><P
>&#13; Pressing the Fn+z key kombination tells the BIOS to recheck the sensors and stops the fan,
for DELL laptops.
</P
></DIV
></DIV
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN4568"
></A
>15.11.6. Harddisk</H2
><P
>&#13; To avoid unnecessary hard disk noise you may use the same
techniques as described in the power saving chapter above.
Modern laptop and notebook hard drives come with a so-called
"Acoustic Management", just have a look into the manual
to get an overview about the possible settings.
</P
><P
>&#13; Some hard disk manufacturers offer dedicated tools, e.g.
Hitachi's
<A
HREF="http://www.hitachigst.com/hdd/support/download.htm"
TARGET="_top"
>Feature Tool</A
>
allows to change the drive Automatic Acoustic Management settings to the
Lowest acoustic emanation setting (Quiet Seek Mode), or
Maximum performance level (Normal Seek Mode). Also
<B
CLASS="command"
>hdparm -M</B
> offers some Acoustic Management options.
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN4574"
></A
>15.11.7. Miscellaneous Applications</H2
><P
>&#13; You may configure <B
CLASS="command"
>vi</B
> with the
<B
CLASS="command"
>flash</B
> option, so it will use a flash in case
of an error, instead of a bell. So just put this line into your
<TT
CLASS="filename"
>.vimrc</TT
> or at the <B
CLASS="command"
>vim</B
> prompt:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;set flash
</PRE
></FONT
></TD
></TR
></TABLE
>
or try
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;set visualbell
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
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