Model 2411H. How can I turn off stuck power saving mode?

you meant

Dell P2411H Black 24" 5ms Height,Swivel & Tilt Adjustable LED Backlight LCD Monitor w/USB Ports 250 cd/m2 1000:1

the answer is YOU CAN NOT do that in the monitor only in the PC, OK.

buttttt
in Control panel + power settings
on all PCs with windows
no PC told no OS told
all from Butttt down is me guessing you blind.

in Linux, or CHROME OS or others ,all a different answer

NO PC told. at all.
we can not guess PCs nor the OS.

oops 2010 monitor the magic date 2010
is the transition year, from CCLF monitors to real LED. (bingo LED)

that means some have sleep timer inside the monitor, push OSD menu button on monitor
turn that off for sure if seen
this Monitor is LED backlamped,
and has no internal timer
if the PC goes to sleep the monitor power lED goes to AMBER to tell that fact.

I read your manual to be sure 2010 is must
wow has Dell monitor diagnostic inside.
very nice that, Dell is great. you meant Dell P2411H Black 24" 5ms Height,Swivel & Tilt Adjustable LED Backlight LCD Monitor w/USB Ports 250 cd/m2 1000:1 the answer is YOU CAN NOT do that in the monitor only in the PC, OK. buttttt in Control panel + power settings on all PCs with windows no PC told no OS told all from Butttt down is me guessing you blind. in Linux, or CHROME OS or others ,all a different answer NO PC told. at all. we can not guess PCs nor the OS. oops 2010 monitor the magic date 2010 is the transition year, from CCLF monitors to real LED. (bingo LED) that means some have sleep timer inside the monitor, push OSD menu button on monitor turn that off for sure if seen this Monitor is LED backlamped, and has no internal timer if the PC goes to sleep the monitor power lED goes to AMBER to tell that fact. I read your manual to be sure 2010 is must wow has Dell monitor diagnostic inside. very nice that, Dell is great.

a working w10 (is it) PC will not get stuck
all you do is hit any key on the keyboard
and the PC ends sleep mode and can be slow if using nasty hibernate mode.
if this fails that means
the USB ports are dead. wire keyboards

The controls for sleep are deep but in one place per above.
make sure USB ports are not dead in device manager. and drivers good there, no errors.
then make sure power settings are set correctly. make sure wake on USB is turned on not off.
a mouse too (wired) can wake up a PC tool
clicked.
if PC is old and upgraded to w10 many of those the USB ports are born dead.

NO PC told at all nor OS

learn this 1 thing
the PC GPU port if it goes dead (sleep)
the monitor sees that and the monitor goes to sleep (by laws in USA, and Energy star )
that is how it works.
so the PC side is CAUSE !
if the cableS did not faLL OFF pc THAT IS. a working w10 (is it) PC will not get stuck all you do is hit any key on the keyboard and the PC ends sleep mode and can be slow if using nasty hibernate mode. if this fails that means the USB ports are dead. wire keyboards The controls for sleep are deep but in one place per above. make sure USB ports are not dead in device manager. and drivers good there, no errors. then make sure power settings are set correctly. make sure wake on USB is turned on not off. a mouse too (wired) can wake up a PC tool clicked. if PC is old and upgraded to w10 many of those the USB ports are born dead. NO PC told at all nor OS learn this 1 thing the PC GPU port if it goes dead (sleep) the monitor sees that and the monitor goes to sleep (by laws in USA, and Energy star ) that is how it works. so the PC side is CAUSE ! if the cableS did not faLL OFF pc THAT IS.