In going over this again, it seems confusing what you are saying and
also what you are trying to accomplish.... You wrote.....
<<<I would like my computer to auto sleep after 15 mins, then hibernate
after 3 hours. My computer will sleep/hibernate if you manually set it
to sleep/hibernate.>>>
First, what are you trying to do? The way stated seems like someone is
making settings for an Unattended Computer? Like if you were
studying/reading something on screen and then have the PC go into Sleep
after 15 Minutes would disrupt what you were reading/studying and have
to move the mouse to get the PC to return On. Then after being in Sleep
mode for 2 Hours 45 Minutes you want the PC to go into Hibernation?
This does not make any sense as normal use. Generally Sleep Mode is
chosen when you are on the PC and, for example, get an important phone
call that needs you're attention - and simply click Sleep. Sleep is used
for generally a short time period, say 10, 20 minutes and Resume.
Hibernation is generally never used except perhaps like in Laptop
business to save the session as you would commute home and then Resume.
Perhaps you are reading something about how to prevent memory loss or
something with a Laptop? You choose to SHUT DOWN as opposed to Sleep or
Hibernate which is going to continually use Battery Power. Check
settings for "Critical" in battery use as the PC should automatically
shut off when power available is generally falling under ten percent
left. THAT is what prevents any type loss or even damages.
If you are in a mobile life, these settings can be used BUT we are
talking use within an hour or two or three, and then normally shut off.
WHAT are you using your specific settings for if I may ask? I have never
seen such a set up.
SECONDLY, you say you can <<<manually set it to sleep/hibernate>>> but
then you say <<<My computer will not auto sleep>>> ..... This seems an
apples and oranges scenario that does not make any sense. The same task
is mentioned by you as "manually" and "auto sleep". In other words when
you MANUALLY set it - this is the SAME as it will AUTOmatically go into
Sleep Mode at the set time. WHAT is the difference you are trying to
make? Whatever setting in minutes you choose - this is then AUTOMATIC
that it will perform that.
Do you mean when you say <<<manually set it to sleep/hibernate>>> that
you are clicking the button to go into Sleep or Hibernate as opposed to
settings? Very confusing what you are actually asking. Maybe you can
clarify. Thank you.