For some reason in the last few days, my keyboard shortcuts to adjust volume broke. I haven't done anything crazy - the only related thing I can think of is I added myself to the audio group so I could get audio over HDMI working (which, btw, was also weird).
Anyways, I didn't think it was a big deal - just go into Keyboard settings and fix the shortcut. Except whenever I try to set my shortcuts, it just acts like I hit Escape or something and they stay disabled.
I ran xev to double check what the system sees those keys as, and also recorded a video using Screencast which confirmed that the keys are being seen as XF86AudioRaiseVolume, XF86AudioLowerVolume, and XF86AudioMute.
For the record, I'm running eOS on a Toshiba Chromebook 2 (2015), with the i3 processor, so I have a chromebook keyboard layout. I ran fascinatingcaptain's script from his github to remap the media keys and everything's been working fine.
Anybody know what's going on?
Video trying to edit keyboard shortcuts
Steps I've Taken So Far
Thanks @Sebastian for all the help so far. I followed your instructions for editing the key settings and then locking them down, and that seemed to make the settings stick. The media keys functioned normally. After a system restart it broke again. I can confirm that the keys are set properly, since gsettings get org.gnome... outputs what I would expect, i.e. XF86AudioRaiseVolume, etc. Also, trying to edit them spits back an error, which seems to confirm that locking them worked.
Here's the output from listing my current media key and keybindings:
gsettings list-recursively org.gnome.settings-daemon.plugins.media-keys | sort | more yields:
org.gnome.settings-daemon.plugins.media-keys active true
org.gnome.settings-daemon.plugins.media-keys area-screenshot-clip '<Ctrl><Shift>Print'
org.gnome.settings-daemon.plugins.media-keys area-screenshot '<Shift>Print'
org.gnome.settings-daemon.plugins.media-keys calculator 'XF86Calculator'
org.gnome.settings-daemon.plugins.media-keys control-center 'XF86Tools'
org.gnome.settings-daemon.plugins.media-keys custom-keybindings ['/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom0/', '/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom1/', '/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom2/', '/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom3/']
org.gnome.settings-daemon.plugins.media-keys decrease-text-size ''
org.gnome.settings-daemon.plugins.media-keys eject 'XF86Eject'
org.gnome.settings-daemon.plugins.media-keys email 'XF86Mail'
org.gnome.settings-daemon.plugins.media-keys help ''
org.gnome.settings-daemon.plugins.media-keys home 'XF86Explorer'
org.gnome.settings-daemon.plugins.media-keys increase-text-size ''
org.gnome.settings-daemon.plugins.media-keys logout '<Control><Alt>Delete'
org.gnome.settings-daemon.plugins.media-keys magnifier '<Alt><Super>8'
org.gnome.settings-daemon.plugins.media-keys magnifier-zoom-in '<Alt><Super>equal'
org.gnome.settings-daemon.plugins.media-keys magnifier-zoom-out '<Alt><Super>minus'
org.gnome.settings-daemon.plugins.media-keys max-screencast-length uint32 30
org.gnome.settings-daemon.plugins.media-keys media 'XF86AudioMedia'
org.gnome.settings-daemon.plugins.media-keys next 'XF86AudioNext'
org.gnome.settings-daemon.plugins.media-keys on-screen-keyboard ''
org.gnome.settings-daemon.plugins.media-keys pause 'XF86AudioPause'
org.gnome.settings-daemon.plugins.media-keys play 'XF86AudioPlay'
org.gnome.settings-daemon.plugins.media-keys previous 'XF86AudioPrev'
org.gnome.settings-daemon.plugins.media-keys priority 0
org.gnome.settings-daemon.plugins.media-keys screencast '<Ctrl><Shift><Alt>R'
org.gnome.settings-daemon.plugins.media-keys screenreader '<Alt><Super>s'
org.gnome.settings-daemon.plugins.media-keys screensaver '<Super>l'
org.gnome.settings-daemon.plugins.media-keys screenshot-clip '<Ctrl>Print'
org.gnome.settings-daemon.plugins.media-keys screenshot 'Print'
org.gnome.settings-daemon.plugins.media-keys search 'XF86Search'
org.gnome.settings-daemon.plugins.media-keys stop 'XF86AudioStop'
org.gnome.settings-daemon.plugins.media-keys terminal '<Super>t'
org.gnome.settings-daemon.plugins.media-keys toggle-contrast ''
org.gnome.settings-daemon.plugins.media-keys video-out '<Super>p'
org.gnome.settings-daemon.plugins.media-keys volume-down 'XF86AudioLowerVolume'
org.gnome.settings-daemon.plugins.media-keys volume-mute 'XF86AudioMute'
org.gnome.settings-daemon.plugins.media-keys volume-up 'XF86AudioRaiseVolume'
org.gnome.settings-daemon.plugins.media-keys window-screenshot '<Alt>Print'
org.gnome.settings-daemon.plugins.media-keys window-screenshot-clip '<Ctrl><Alt>Print'
org.gnome.settings-daemon.plugins.media-keys www 'XF86WWW'
gsettings list-recursively org.gnome.desktop.wm.keybindings | sort | more yields:
org.gnome.desktop.wm.keybindings activate-window-menu ['<Alt>space']
org.gnome.desktop.wm.keybindings always-on-top @as []
org.gnome.desktop.wm.keybindings begin-move ['<Alt>F7']
org.gnome.desktop.wm.keybindings begin-resize ['<Alt>F8']
org.gnome.desktop.wm.keybindings close ['<Alt>F4']
org.gnome.desktop.wm.keybindings cycle-group ['<Alt>F6']
org.gnome.desktop.wm.keybindings cycle-group-backward ['<Shift><Alt>F6']
org.gnome.desktop.wm.keybindings cycle-panels-backward ['<Shift><Control><Alt>Escape']
org.gnome.desktop.wm.keybindings cycle-panels ['<Control><Alt>Escape']
org.gnome.desktop.wm.keybindings cycle-windows ['<Alt>Escape']
org.gnome.desktop.wm.keybindings cycle-windows-backward ['<Shift><Alt>Escape']
org.gnome.desktop.wm.keybindings lower @as []
org.gnome.desktop.wm.keybindings maximize @as []
org.gnome.desktop.wm.keybindings maximize-horizontally @as []
org.gnome.desktop.wm.keybindings maximize-vertically @as []
org.gnome.desktop.wm.keybindings minimize ['<Super>h']
org.gnome.desktop.wm.keybindings move-to-center @as []
org.gnome.desktop.wm.keybindings move-to-corner-ne @as []
org.gnome.desktop.wm.keybindings move-to-corner-nw @as []
org.gnome.desktop.wm.keybindings move-to-corner-se @as []
org.gnome.desktop.wm.keybindings move-to-corner-sw @as []
org.gnome.desktop.wm.keybindings move-to-monitor-down ['<Super><Shift>Down']
org.gnome.desktop.wm.keybindings move-to-monitor-left ['<Super><Shift>Left']
org.gnome.desktop.wm.keybindings move-to-monitor-right ['<Super><Shift>Right']
org.gnome.desktop.wm.keybindings move-to-monitor-up ['<Super><Shift>Up']
org.gnome.desktop.wm.keybindings move-to-side-e @as []
org.gnome.desktop.wm.keybindings move-to-side-n @as []
org.gnome.desktop.wm.keybindings move-to-side-s @as []
org.gnome.desktop.wm.keybindings move-to-side-w @as []
org.gnome.desktop.wm.keybindings move-to-workspace-10 @as []
org.gnome.desktop.wm.keybindings move-to-workspace-11 @as []
org.gnome.desktop.wm.keybindings move-to-workspace-12 @as []
org.gnome.desktop.wm.keybindings move-to-workspace-1 ['<Super><Shift>1', '<Super><Alt>1']
org.gnome.desktop.wm.keybindings move-to-workspace-2 ['<Super><Shift>2', '<Super><Alt>2']
org.gnome.desktop.wm.keybindings move-to-workspace-3 ['<Super><Shift>3', '<Super><Alt>3']
org.gnome.desktop.wm.keybindings move-to-workspace-4 ['<Super><Shift>4', '<Super><Alt>4']
org.gnome.desktop.wm.keybindings move-to-workspace-5 ['<Super><Shift>5', '<Super><Alt>5']
org.gnome.desktop.wm.keybindings move-to-workspace-6 ['<Super><Shift>6', '<Super><Alt>6']
org.gnome.desktop.wm.keybindings move-to-workspace-7 ['<Super><Shift>7', '<Super><Alt>7']
org.gnome.desktop.wm.keybindings move-to-workspace-8 ['<Super><Shift>8', '<Super><Alt>8']
org.gnome.desktop.wm.keybindings move-to-workspace-9 ['<Super><Shift>9', '<Super><Alt>9']
org.gnome.desktop.wm.keybindings move-to-workspace-down ['<Super><Shift>Page_Down', '<Control><Shift><Alt>Down']
org.gnome.desktop.wm.keybindings move-to-workspace-last ['<Super><Shift>End']
org.gnome.desktop.wm.keybindings move-to-workspace-left ['<Super><Alt>Left']
org.gnome.desktop.wm.keybindings move-to-workspace-right ['<Super><Alt>Right']
org.gnome.desktop.wm.keybindings move-to-workspace-up ['<Super><Shift>Page_Up', '<Control><Shift><Alt>Up']
org.gnome.desktop.wm.keybindings panel-main-menu ['<Super>space', '<Alt>F2']
org.gnome.desktop.wm.keybindings panel-run-dialog @as []
org.gnome.desktop.wm.keybindings raise @as []
org.gnome.desktop.wm.keybindings raise-or-lower @as []
org.gnome.desktop.wm.keybindings set-spew-mark @as []
org.gnome.desktop.wm.keybindings show-desktop ['<Super>Down', '<Super>s']
org.gnome.desktop.wm.keybindings switch-applications @as []
org.gnome.desktop.wm.keybindings switch-applications-backward @as []
org.gnome.desktop.wm.keybindings switch-group-backward ['<Shift><Super>Above_Tab', '<Shift><Alt>Above_Tab']
org.gnome.desktop.wm.keybindings switch-group ['<Super>Above_Tab', '<Alt>Above_Tab']
org.gnome.desktop.wm.keybindings switch-input-source @as []
org.gnome.desktop.wm.keybindings switch-input-source-backward @as []
org.gnome.desktop.wm.keybindings switch-panels-backward ['<Shift><Control><Alt>Tab']
org.gnome.desktop.wm.keybindings switch-panels ['<Control><Alt>Tab']
org.gnome.desktop.wm.keybindings switch-to-workspace-10 @as []
org.gnome.desktop.wm.keybindings switch-to-workspace-11 @as []
org.gnome.desktop.wm.keybindings switch-to-workspace-12 @as []
org.gnome.desktop.wm.keybindings switch-to-workspace-1 ['<Super>1']
org.gnome.desktop.wm.keybindings switch-to-workspace-2 ['<Super>2']
org.gnome.desktop.wm.keybindings switch-to-workspace-3 ['<Super>3']
org.gnome.desktop.wm.keybindings switch-to-workspace-4 ['<Super>4']
org.gnome.desktop.wm.keybindings switch-to-workspace-5 ['<Super>5']
org.gnome.desktop.wm.keybindings switch-to-workspace-6 ['<Super>6']
org.gnome.desktop.wm.keybindings switch-to-workspace-7 ['<Super>7']
org.gnome.desktop.wm.keybindings switch-to-workspace-8 ['<Super>8']
org.gnome.desktop.wm.keybindings switch-to-workspace-9 ['<Super>9']
org.gnome.desktop.wm.keybindings switch-to-workspace-down @as []
org.gnome.desktop.wm.keybindings switch-to-workspace-last ['<Super>End']
org.gnome.desktop.wm.keybindings switch-to-workspace-left ['<Super>Left']
org.gnome.desktop.wm.keybindings switch-to-workspace-right ['<Super>Right']
org.gnome.desktop.wm.keybindings switch-to-workspace-up @as []
org.gnome.desktop.wm.keybindings switch-windows ['<Alt>Tab']
org.gnome.desktop.wm.keybindings switch-windows-backward ['<Alt><Shift>Tab']
org.gnome.desktop.wm.keybindings toggle-above @as []
org.gnome.desktop.wm.keybindings toggle-fullscreen @as []
org.gnome.desktop.wm.keybindings toggle-maximized ['<Super>Up']
org.gnome.desktop.wm.keybindings toggle-on-all-workspaces @as []
org.gnome.desktop.wm.keybindings toggle-shaded @as []
org.gnome.desktop.wm.keybindings unmaximize ['<Alt>F5']
Final Solution (Sort Of)
I followed the suggestions from @Sebastian to edit the key settings and then lock them, but did so in a root shell, which seems to let the settings persist through reboots.
Follow up - shortcuts don't persist through reboots anymore. But the shortcuts can be made to stick, at least temporarily, but editing the settings in a root shell, locking them, and then updating dconf via dconf update. I'll probably just make a script to do this on startup for now until it gets fixed upstream.
