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Thread: acpi and Synaptics touchpad

  1. #1
    Join Date
    Mar 2007
    Beans
    103
    Distro
    Xubuntu 12.04 Precise Pangolin

    acpi and Synaptics touchpad

    I recently booted into Karmic with acpi=off (I was trying to find out if a bug I've been experiencing was kernel bug 9147). This had the side-effect of disabling my touchpad.

    I tried adding i8042.nomux=1, but this didn't help.

    Does anyone know of a workaround I can use to get the touchpad working with acpi=off, or is there nothing for it but to remove that boot option?

    Thanks,

    James.

  2. #2
    Join Date
    Mar 2007
    Beans
    103
    Distro
    Xubuntu 12.04 Precise Pangolin

    Re: acpi and Synaptics touchpad

    bump

  3. #3
    Join Date
    Jan 2009
    Location
    St Petersburg, RF
    Beans
    8

    Re: acpi and Synaptics touchpad

    That's a pretty old thread but the problem remains so here are my two cents.

    After kernel upgrade I've got cpu soft lockups during boot which was cured by adding
    "acpi=off" to /etc/default/grub. This solution killed my touchpad though, just as it did for james_mcl above.
    Luckily, acpi=off is not the only possible option. There are also
    acpi=oldboot
    Deactivates the ACPI system almost completely; only the components required for the boot process will be used.
    acpi=ht
    Deactivates the ACPI system almost completely; only the components required for hyper threading will be used.
    acpi.power_nocheck=1 OR acpi_osi=linux
    The first one, acpi=oldboot, worked for me, although the boot duration increased somewhat.

    I'll add some generalized instructions in case someone would need them
    To try things out at the boot time, when GRUB starts, press "e" - that's for editing, and add various options one at a time, them Ctrl-x and see what happens. With the best variant go to /etc/default/grub and don't forget to sudo update-grub to preserve changes.

    This is hardly a solution, but it brings the usable laptop back

  4. #4
    Join Date
    Feb 2007
    Beans
    23,794
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: acpi and Synaptics touchpad

    From the Ubuntu Forums Code of Conduct.
    If a post is older than a year or so and hasn't had a new reply in that time, instead of replying to it, create a new thread. In the software world, a lot can change in a very short time, and doing things this way makes it more likely that you will find the best information. You may link to the original discussion in the new thread if you think it may be helpful.
    Thread closed.

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