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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style type="text/css">
@import url('../css/main.css');
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<title>Miscellaneous</title>
</head>
<body>
<div class="section">
<h1 id="pagetop">Miscellaneous</h1>
<p>
Or <a href="../index.html">Back to main index</a>.
</p>
<ul>
<li><a href="#trisquel7_powertop">High Pitched Whining Noise on Idle (how to remove in Trisquel 7)</a></li>
<li><a href="#high_pitch_parabola">High Pitched Whining Noise on Idle (how to remove in Parabola)</a></li>
<li><a href="#serial">X60/T60: Serial port - how to use (for dock owners)</a></li>
<li><a href="patch.html">Using diff and patch</a></li>
<li><a href="#get_edid_panelname">Get EDID: Find out the name (model) of your LCD panel</a></li>
</ul>
</div>
<div class="section">
<h1 id="trisquel7_powertop">High Pitched Whining Noise on Idle (how to remove in Trisquel)</h1>
<p>
Tested in Trisquel 7.
</p>
<div class="subsection">
<h2 id="trisquel7_powertop_autostart">Powertop - Start automatically at boot time (Trisquel 7)</h2>
<p>Included with libreboot is a script called 'powertop.trisquel7'. Run this as root and it will setup powertop to run with --auto-tune
at boot time. Load the file in your text editor to see how it does that.</p>
<p>$ <b>sudo ./resources/scripts/misc/powertop.trisquel7</b></p>
</div>
<p><a href="#pagetop">Back to top of page</a></p>
</div>
<div class="section">
<h1 id="high_pitch_parabola">High Pitched Whining Noise on Idle (how to remove in Parabola)</h1>
<p>The following removes most of the noise. It reduces what is a high frequency whine
(that not everyone can hear) to a slight buzz (which most people can't hear or doesn't bother most people).</p>
<p>This is not perfect! The full solution is still not discovered but this is a step towards that.
Also, in some instances you will need to run 'sudo powertop --auto-tune' again.
This needs to be implemented properly in coreboot itself!</p>
<p>On the X60 with coreboot or libreboot, there is a high pitched sound when idle.
So far we have use processor.max_cstate=2 or idle=halt in GRUB.
These consume power. Stop using them! </p>
<p>Be root<br/>
<b>$ su -</b></p>
<p>Installed powertop:<br/>
<b># pacman -S powertop</b></p>
<p>and added the following to /etc/systemd/system/powertop.service :</p>
<pre><i>
[Unit]
Description=Powertop tunings
[Service]
Type=oneshot
RemainAfterExit=no
ExecStart=/usr/bin/powertop --auto-tune
# "powertop --auto-tune" still needs a terminal for some reason. Possibly a bug?
Environment="TERM=xterm"
[Install]
WantedBy=multi-user.target
</i></pre>
<p>Finally, as root do that:<br/>
<b># systemctl enable powertop</b><br/>
<b># systemctl start powertop</b></p>
<p>The next time you boot the machine, the buzz will be gone.</p>
<p><a href="#pagetop">Back to top of page</a></p>
</div>
<div class="section">
<h1 id="serial">X60/T60: Serial port - how to use (for dock owners)</h1>
<p>
For the Thinkpad X60 you can use the <b>"UltraBase X6"</b> dock (for the X60 Tablet it is called
X6 Tablet UltraBase). For the ThinkPad T60,
you can use the <b>"Advanced Mini Dock"</b>.
</p>
<p>
If you are using one of the ROM images with 'serial' in the name, then you have serial port enabled in libreboot
and you have memtest86+ included inside the ROM. Connect your null modem cable to the serial port on the dock
and connect the other end to a 2nd machine using your USB Serial adapter.
</p>
<p>
On the 2nd machine, you can try this (using GNU Screen):<br/>
<b>$ sudo screen /dev/ttyUSB0 115200</b>
</p>
<p>
How to quit GNU Screen: Ctrl+A then release and press K, and then press Y.
</p>
<p>There are also others like Minicom but I like GNU Screen</p>
<p>
By doing this before booting the X60/T60, you will see console output from libreboot. You will also see
GRUB displaying on the serial output, and you will be able to see MemTest86+ on the serial output aswell.
You can also configure your distro so that a terminal (TTY) is accessible from the serial console.
</p>
<p>
The following guide is for Ubuntu, and can be followed for Trisquel 6.0 which is based on Ubuntu 12.04
(should also work in Trisquel 7, based on Ubuntu 14.04) to enable a serial console using GeTTY:<br/>
<a href="https://help.ubuntu.com/community/SerialConsoleHowto">https://help.ubuntu.com/community/SerialConsoleHowto</a>
</p>
<p>
Note: part of the tutorial above requires changing your grub.cfg. Just change the <b>linux</b> line to add instructions for enabling getty.
See <a href="../gnulinux/grub_cbfs.html">../gnulinux/grub_cbfs.html</a>.
</p>
<p><a href="#pagetop">Back to top of page</a>
</div>
<div class="section">
<h1 id="get_edid_panelname">Get EDID: Find out the name (model) of your LCD panel</h1>
<p>
Get the panel name with <b>sudo get-edid | strings</b><br/>
Or look in <b>/sys/class/drm/card0-LVDS-1/edid</b>
</p>
<p>
Alternatively you can use i2cdump. In Trisquel, this is in the package i2c-tools.<br/>
$ <b>sudo modprobe i2c-dev</b><br/>
$ <b>sudo i2cdump -y 5 0x50</b><br/>
$ <b>sudo rmmod i2c-dev</b><br/>
You'll see the panel name in the output (from the EDID dump).
</p>
<p>
If neither of these options work (or they are unavailable), physically removing the LCD panel is an option.
Usually, there will be information printed on the back.
</p>
<p><a href="#pagetop">Back to top of page.</a></p>
</div>
<div class="section">
<p>
Copyright © 2014, 2015 Francis Rowe <info@gluglug.org.uk><br/>
This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions.
A copy of the license can be found at <a href="../license.txt">../license.txt</a>.
</p>
<p>
This document is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See <a href="../license.txt">../license.txt</a> for more information.
</p>
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