DebuggingTouchpadDetection
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This page is part of the debugging series — pages with debugging details for a variety of Ubuntu packages. |
Contents |
Introduction
Problems with touchpad detection typically fall into one off these categories:
- Your touchpad doesn't work at all.
- Your touchpad stops working after a while.
- Some features of your touchpad like scrolling, tapping, dragging don't work (as expected).
How to file a bug report
Touchpad related bugs should initially be filed against xserver-xorg-input-synaptics. If the bug turns out to be a kernel bug or a bug in another package, bug triagers can assign the bug additionally to that package and mark the xserver-xorg-input-synaptics task as invalid.
General information
For all bug categories the following general information should be provided:
What brand and model is your laptop, open a terminal/console and enter the following command:
$ cd /var/lib/acpi-support/; grep '.' *-* > ~/laptop
What features does your touchpad have: horizontal and vertical scrolling, tapping, dragging, ...Open a terminal/console and enter the following commands (minimal information as described in KernelTeamBugPolicies):
$ uname -a > ~/uname-a $ cat /proc/version_signature > ~/version_signature $ sudo lspci -vvnn > ~/lspci-vvnn
Attach ~/laptop, ~/uname-a, ~/version_signature and ~/lspci-vvnn to the bug report as separate attachments.
In case your touchpad doesn't work at all
Provide the general information.
Enter the following command in a terminal/console:
$ dmesg > ~/dmesg
Attach ~/dmesg and your /var/log/Xorg.0.log to the bug report in separate attachments.
In case your touchpad stops working after a while
Provide the general information.
Direct after logging in to GNOME, KDE or Xfce open a terminal and enter the following commands:
$ dmesg > ~/dmesg_boot $ cp /var/log/Xorg.0.log ~/Xorg.0.log
- Wait until your touchpad stops working.
- Open a Virtual Terminal by pressing Ctrl-Alt-F1.
Enter the following commands:
$ LANG=C $ dmesg > ~/dmesg $ diff -ns ~/dmesg_boot ~/dmesg > ~/dmesg_diff $ cp /var/log/Xorg.0.log ~/Xorg.0.log_tmp $ diff -ns ~/Xorg.0.log ~/Xorg.0.log_tmp > ~/Xorg.0.log_diff
Attach ~/dmesg_boot, ~/dmesg_diff, ~/Xorg.0.log and ~/Xorg.0.log_diff to the bug report in separate attachments.
In case some features of your touchpad like scrolling, tapping, dragging don't work (as expected)
Provide the general information.
Open a terminal and enter the following commands:
$ cat /proc/bus/input/devices > ~/devices $ dmesg > ~/dmesg
Attach your /var/log/Xorg.0.log, ~/devices and ~/dmesg to the bug report in separate attachments.
DebuggingTouchpadDetection (last edited 2019-02-26 09:05:55 by anthonywong)