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Thread: intermittent ctrl keys on matebook X

  1. #1
    Join Date
    Jun 2018

    Question intermittent ctrl keys on matebook X

    Just installed xubuntu 18.04 on a huawei matebook X with a japanese keyboard.
    After the initial install everything looked great, but after powering on the next day i noticed that the control keys weren't working (do not show up in xev or showkey) ... funny, i'm sure they worked last night...
    There's a lot of "control key not working" forum content to get through (mostly keyboard shortcut related), but none of it worked for me (gnome-tweak-tool included). Apologies if i somehow missed the killer thread.

    After scratching my head a few hours i noticed that they started showing flickers of life ... working intermittently ... few hours more, the battey is running down so i connect the power - then they're suddely working 100%.

    Have now repeated several times and as far as i can see it's like this:
    • from power on with battery only : ctrl keys not working
    • on battery, after a little use (crazy ctrl-c'ing in terminal window) : start working intermittently, but not to a useable degree
    • with power connected : work 100%
    • behaviour is exactly the same for L/R ctrl keys. No other keys have problems

    Unfortunately this was a new laptop and i deleted windows so i have no evidence that it's not a h/w fault, but i don't see how a hardware fault would affect only, and both ctrl keys.

    Any ideas?

  2. #2
    Join Date
    Apr 2008
    Southern California, USA
    Ubuntu Development Release

    Re: intermittent ctrl keys on matebook X

    "Settings > Hardware > Keyboard"
    What does your keyboard layout show?

  3. #3
    Join Date
    Jun 2018

    Re: intermittent ctrl keys on matebook X

    Thanks for responding.
    Currently it is set to Japanese (kana 86), the model, customization and compose key options are all unset (menus show "-").
    I have tried a couple of the other japanese layouts too but didn't notice any difference in behaviour. To be honest i don't know what the most correct setting is here.

    UPDATE: kana-86 is the correct setting, but this is irrelevant to the problem.
    Last edited by yuzuuser; June 18th, 2018 at 04:46 AM.

  4. #4
    Join Date
    Jun 2018

    Re: intermittent ctrl keys on matebook X

    ... after that, i accepted some auto-updates, and then the ctrl keys stopped working alltogether ... have now given up and arrived at a useable environment via a bunch of xmodmaps.

    I guess this is a matebook issue, rather than any shortcut/keyboard mapping thing (as discussed elsewhere, media keys also don't work on matebook linux). Would still be interested to hear from anyone who has a properly working matebook X with JP keyboard, or who has seen this seemingly power-related intermittent behaviour.

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