[DNSB]

Originally Posted by JSWolf

Also, if this is supposed to be images for the screensaver, you create a directory called screensaver under the .kobo directory. No need for a sleep directory.

However, if you turn off the screensaver mode by renaming the screensaver directory by renaming to screensaver_old or screensaver.old or other filename of your choice, that name is not automagically excluded.

For me I use the following NickelMenu command to toggle the screensaver on/off:

menu_item : main : Toggle screensaver    : cmd_output     : 500: quiet: test -e /mnt/onboard/.kobo/screensaver_old
      chain_failure  : skip : 3
      chain_success  : cmd_spawn         : quiet: mv /mnt/onboard/.kobo/screensaver_old /mnt/onboard/.kobo/screensaver
      chain_success  : dbg_toast         : Screensaver on
      chain_always   : skip              : -1
      chain_failure  : cmd_spawn         : quiet          : mv /mnt/onboard/.kobo/screensaver /mnt/onboard/.kobo/screensaver_old
      chain_success  : dbg_toast         : Screensaver off

And in the /.kobo/Kobo/Kobo eReader.conf file under the [FeatureSettings] header, I use the following exclusion settings:

[FeatureSettings]
ExcludeSyncFolders=(\\.(?!kobo|adobe).+|([^.][^/]*/)+\\..+)|(screensaver_old)

A directory named sleep in the root of the partition exposed over USB does not seem to do anything so unless you have been patching the Kobo code, there is no reason to have that directory.