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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - mouse-dpi-tool reports 0 dpi"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99523">99523</a>
</td>
</tr>
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<th>Summary</th>
<td>mouse-dpi-tool reports 0 dpi
</td>
</tr>
<tr>
<th>Product</th>
<td>libevdev
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Core
</td>
</tr>
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<th>Assignee</th>
<td>peter.hutterer@who-t.net
</td>
</tr>
<tr>
<th>Reporter</th>
<td>guillaume.horel@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dri-devel@lists.freedesktop.org, rankincj@googlemail.com, samuel.pitoiset@gmail.com
</td>
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<th>Depends on</th>
<td>94186
</td>
</tr></table>
<p>
<div>
<pre>I'm trying to record the dpi for my touchpad since it seems quite slow. However
it can't seem to compute any distance as I move my finger. This is the output
from mouse-dpi-tool. It seems to record the frequency fine, but doesn't read
any distance:
sudo ./mouse-dpi-tool /dev/input/event7
Mouse FocalTechPS/2 FocalTech Touchpad on /dev/input/event7
Move the device 250mm/10in or more along the x-axis.
Pause 3 seconds before movement to reset, Ctrl+C to exit.
Covered distance in device units: 0 at frequency 70.4Hz /^C
Estimated sampling frequency: 70Hz (mean 62Hz)
To calculate resolution, measure physical distance covered
and look up the matching resolution in the table below
0mm 0.00in 400dpi
0mm 0.00in 600dpi
0mm 0.00in 800dpi
0mm 0.00in 1000dpi
0mm 0.00in 1200dpi
0mm 0.00in 1400dpi
0mm 0.00in 1600dpi
0mm 0.00in 1800dpi
0mm 0.00in 2000dpi
0mm 0.00in 2200dpi
0mm 0.00in 2400dpi
If your resolution is not in the list, calculate it with:
resolution=0/inches, or
resolution=0 * 25.4/mm
Output from udevadm info:
P: /devices/platform/i8042/serio4/input/input12/event7
N: input/event7
E: DEVNAME=/dev/input/event7
E: DEVPATH=/devices/platform/i8042/serio4/input/input12/event7
E: ID_BUS=i8042
E: ID_INPUT=1
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: LIBINPUT_DEVICE_GROUP=11/2/12/0:isa0060/serio4
E: MAJOR=13
E: MINOR=71
E: SUBSYSTEM=input
E: USEC_INITIALIZED=2131871
Entry for hwdb match (replace XXX with the resolution in DPI):
mouse:unknown bus type:v0002p0012:name:FocalTechPS/2 FocalTech Touchpad:
MOUSE_DPI=XXX@70
This is a FocalTech Touchpad on an Asus UX303UB latpop.</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Crash when launching glxinfo and World of Warcraft with RV790"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94186">Bug 94186</a>] Crash when launching glxinfo and World of Warcraft with RV790
</li>
</ul>
</div>
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