ChrUbuntu + Acer C720

Collected Tips and Fixes

I’ve been running ChrUbuntu on a C720 for a couple months now. It’s a great cheap laptop option for developers, but it does require a few OS tweaks. This is a list of the ones I’ve been using.

I found most of these in the ChrUbuntu communities on Reddit and Google+. If you know any other tips, leave a comment and I’ll add them to the list.

Restore the trackpad:

  1. Ctrl+Alt+T
    • wget
    • sudo bash kz917j
      • This can take a long time.


Enable suspend:

  1. Ctrl+Alt+T
    • edit: /etc/default/grub
    • add: GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash add_efi_memmap boot=local noresume noswap i915.modeset=1 tpm_tis.force=1 tpm_tis.interrupts=0 nmi_watchdog=panic,lapic”
    • close file
    • sudo update-grub
    • sudo update-grub2
    • reboot


Change the default screen brightness

  1. Ctrl+Alt+T
    • edit: /etc/rc.local
    • add: echo 300 > /sys/class/backlight/intel_backlight/brightness
      • substitute any number up to 900 for “300” in the line above
      • To test different brightness levels
    1. echo 300 | sudo tee /sys/class/backlight/intel_backlight/brightness > /dev/null
      • repeat above command substituting numbers up to 900


Remap the search key to shift key

  1. Ctrl+Alt+T
    • xmodmap -e “keycode 133 = Shift_L”
      • Unfortunately, this is a temporary fix. You’ll need to rerun this command at every reboot.


Disable trackpad while typing

  1. Ctrl+Alt+T
    • syndaemon -i 1 -K d
      • This will continue running in your Terminal window. Press Ctrl-C to stop it.


Mute the login sound

  1. On the login screen, before you enter your User Name and Password, go to the speaker icon in upper right-hand corner of your screen and select mute.
    • From now on the audio will be muted on the login screen. Audio will return to normal once you’re logged in.