Since the phone was auto crashed when suspending I had to disable it in the settings.
After disabling this it is impossible to re-enable it with the same timeout value.
How I disabled
settings -> Power -> Suspend & Power Button -> Automatic Suspend
See that Delay = 1 here
Turn off On Battery Power
Trying to re-enable this gives only the minimal option to suspend after 15 minutes and max 2 hours.
On gnome a hack would be
dconf write /org/gnome/settings-daemon/plugins/power/sleep-inactive-battery-timeout 60
where the last number is the time in seconds, before it suspends when on battery power. You can use any number greater than 1s. [This will show up in settings, but it vanishes again after you disable it]
Perhaps this will work on your phone.
This whole thing has to be rewritten. On a smartphone you want to decide in seconds or small numbers of minutes when screen turns off, when phone suspends, etc; and one wants to be able to give the time, not to choose from an inappropriate list.
The command does the same as dconf-editor, just on the commandline.