108 lines
3.4 KiB
HTML
108 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Workaround for broken TrackPoint</title>
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<style>
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* {
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box-sizing: border-box;
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overflow-wrap: break-word;
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word-wrap: break-word; /* legacy */
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word-break: break-word; /* for WebKit/Chrome */
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}
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main {
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max-width: 36rem;
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margin: 0 auto;
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}
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code, .email {
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font-family: monospace, monospace;
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}
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.asterism, footer {
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margin: 2rem 0;
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text-align: center;
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}
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pre {
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overflow-x: auto;
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background-color: #eee;
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border-radius: 5px;
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padding: 10px;
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}
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</style>
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</head>
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<body>
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<main>
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<p><a href="/">Index</a></p>
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<h1>Workaround for broken TrackPoint</h1>
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<small><time>2022-12-05</time></small>
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<p>
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Sometimes, seemingly at random after clicking the dedicated left click
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or right click buttons, the buttons and trackpoint on my Lenovo
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Thinkpad T14s stops working. Instead of clicking, the three mouse
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buttons just makes the pointer move a bit and the trackpoint makes the
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pointer move in a random direction and seems to issue clicks.
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</p>
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<p>
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When this happens, the kernel buffer is spammed with "<code>psmouse
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serio1: elantech: discarding packet</code>". Searching the interwebs,
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I found that more people seem to be experiencing similar weirdness with
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the elantech trackpoint driver.
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</p>
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<p>
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Rebooting the computer works, but it's annoying. Removing and re-adding
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the misbehaving kernel module resolves the issue too fortunately. I
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put the following in <code>~/bin/fixmouse</code>:
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<pre><code>#!/bin/sh
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doas rmmod psmouse
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doas modprobe psmouse
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</pre></code>
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So now I can run <code>fixmouse</code> whenever the driver stops
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working.
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</p>
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<hr>
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<p><i>Update 2023-09-24:</i> If the psmose module is builtin, it can't be
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unloaded, giving "<code>rmmod: ERROR: Module psmouse is builtin.</code>"
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Fortunately, there's a better way of reloading the trackpad using a
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method described in an
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<a href="https://lwn.net/Articles/143397/">article on LWN</a> from 2005.
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</p>
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<p>The error in the kernel buffer indicates that the trackpad is called
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<code>serio1</code>, but for posterity we can find devices using the
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<code>psmouse</code> driver with <code>find</code>:
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<pre><code>$ find /sys/bus -name psmouse
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/sys/bus/serio/drivers/psmouse
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$ ls -l /sys/bus/serio/drivers/psmouse
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total 0
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--w-------. 1 root root 4096 Sep 23 22:19 bind
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-rw-r--r--. 1 root root 4096 Sep 23 22:19 bind_mode
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-r--r--r--. 1 root root 4096 Sep 23 22:19 description
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lrwxrwxrwx. 1 root root 0 Sep 24 10:42 serio1 -> ../../../../devices/platform/i8042/serio1
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--w-------. 1 root root 4096 Sep 23 14:20 uevent
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--w-------. 1 root root 4096 Sep 24 10:36 unbind
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</pre></code>
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As described in the article, we can unbind the touchpad with (as root)
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<pre><code>echo -n "serio1" > /sys/bus/serio/drivers/psmouse/unbind</pre></code>
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My touchpad rebinds automatically after a few seconds, but you should be
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able to bind it manually using
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<code>[...]/psmouse/bind</code>.
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</main>
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<footer>❦</footer>
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</body>
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</html>
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<!-- vim: set tw=79 -->
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