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I'm running Gentoo Linux on an Acer Chromebook 15 (CB5-571 auron_yuna) and I have a minimal kernel configured supporting everything I need except for my Elantech touchpad. I've read a bunch if other Stack exchange answers which suggest i8042.{nopnp,nmux,noloop,reset}, and using those the AUX port (where the touchpad is found) is discovered (as seen in the dmesg at http://pasted.co/478bf881), but the touchpad itself is not recognized. Since I have heavily modded the kernel (such that required firmware is built in and no modules are used and it only builds to a 6.9M initramfsless executable) I assume that I a missing some piece of kernel config (http://pasted.co/00aad1c3) which adds support to it. What config am I missing? Everything touchpad-related among CONFIG_*ELAN* is selected, and so is most of the CROS and CHROME stuff (CROS_LPC did not seem to work and spewed out a 'cannot find EC ID' error or something). What am I missing?

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    Is there relevant information in /proc/bus/input/devices? Anyway try selecting all CONFIG_I2C_DESIGNWARE_* options.
    – jimmij
    Dec 16, 2018 at 8:20
  • @jimmij the touchpad does not appear in /proc/bus/input/devices , but the keyboard (running through the same i8042 port) does. I will test the DESIGNWARE config, which was completely disabled (I2C_DESIGNWARE_CORE=n).
    – ARaspiK
    Dec 16, 2018 at 8:38

1 Answer 1

Reset to default
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@jimmij solved it, suggesting enabling CONFIG_I2C_DESIGNWARE_*. My whole kernel config (for reference) can be found here: http://pasted.co/1f8d4965

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  • Good. If you want to keep your kernel config minimal you can (most probably) unselect CONFIG_I2C_DESIGNWARE_PCI. Crucial ones are *_CORE and *_PLATFORM.
    – jimmij
    Dec 16, 2018 at 17:09
  • @jimmij Thanks! I'm actually working on minimizing my config now, so that helps.
    – ARaspiK
    Dec 19, 2018 at 4:15

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