…except that –debug isn’t one of gsd-color’s recognized parameters, and adding it caused GDM to fail to start. I changed it to –verbose which is available.

10.08 jani@saegusa:~$ LC_ALL=C /usr/lib/gnome-settings-daemon/gsd-color –help-all
Usage:
gsd-color [OPTION?] color

Help Options:
-h, –help Show help options
–help-all Show all help options
–help-gtk Show GTK+ Options

GTK+ Options
–class=CLASS Program class as used by the window manager
–name=NAME Program name as used by the window manager
–gdk-debug=FLAGS GDK debugging flags to set
–gdk-no-debug=FLAGS GDK debugging flags to unset
–gtk-module=MODULES Load additional GTK+ modules
–g-fatal-warnings Make all warnings fatal
–gtk-debug=FLAGS GTK+ debugging flags to set
–gtk-no-debug=FLAGS GTK+ debugging flags to unset

Application Options:
–exit-time Exit after n seconds time
–dummy-name Name when using the dummy daemon
-v, –verbose Verbose
–display=DISPLAY X display to use

There’s also –gtk-debug and –gdk-debug, but I could do with a little help for what to select for those, as just giving ’all’ seems a little counterproductive (for instance, ”touchscreen” and ”interactive” don’t seem very useful here).

10.03 jani@saegusa:~$ LC_ALL=C /usr/lib/gnome-settings-daemon/gsd-color –gtk-debug help
Supported debug values: misc plugsocket text tree updates keybindings multihead modules geometry icontheme printing builder size-request no-css-cache baselines pixel-cache no-pixel-cache interactive touchscreen actions resize layout all help

10.04 jani@saegusa:~$ LC_ALL=C /usr/lib/gnome-settings-daemon/gsd-color –gdk-debug help
Supported debug values: events misc dnd xim nograbs input cursor multihead xinerama draw eventloop frames settings opengl all help
Error parsing option –gdk-debug

(Looks like –gdk-debug reports an error with ’help’, despite having just listed it as one of the options.)