I have HP Notebook-14 running Ubuntu 16.04. With external keyboard and mouse connected via USB, it works perfectly fine. However, I only discovered recently that the internal keyboard and mousepad are somehow disabled: when the external ones are removed, internal keyboard and mousepad are not responsive at all. I have no clue when this happened and how it happened. Tried turn-it-off-and-on-again several times, but the problem still persists and I am totally clueless. Could any one give me any hint?
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Most laptops have either a dedicated key, or a function+f key combo to disable/enable touchpad and/or keyboard. Have you checked for this on your laptop? – justus95 Jun 21 '20 at 18:14
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@justus95 Thank you for this hint. However, I am not aware of any dedicated key on the internal keyboard that has this function. I also have no any impression that I pressed any key combo to disable keyboard. – X... Jun 21 '20 at 18:27
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Looks like I found the smoking gun. In an earlier attempt to resolve the issue that Ubuntu 16.04 didn't power down after clicking shutdown, I changed in file /etc/default/grub the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"
According to this post, it appears that the third option might be the smoking gun. Indeed, after dropping acpi=force the laptop's built-in keyboard and mousepad come back top live again.
X...
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