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October 16th, 2025 05:12
S3 sleep on precision 7560
Hi, so I bought Dell Precision 7560, separately bought official ECC RAM 128Gb which works at 3200MT/s. I bought it for work, but never had time to properly set up. Overheating issue in bagpack I blamed on windows 11 or drivers.
But recetly I found a time and discovered to myself that many people are having issues with sleep and overheating.
Now, in bios I've got an option to block S3 
but does not matter whether this option is enabled or disabled, it seems not working. I trying on windows 11, windows 10 and ubuntu.
Why I cannot turn on s3 ?
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user_72970a
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October 16th, 2025 05:44
The Precision 7560 doesn’t support traditional S3 sleep due to its modern standby (S0ix) power design. Dell locked S3 in BIOS on newer models to align with Intel’s platform firmware. That’s why enabling or disabling the option has no effect. Unfortunately, there’s no way to fully restore S3 — you can only adjust sleep behavior or use hibernate to avoid overheating.
dellus1onal
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October 16th, 2025 16:11
@user_72970a
this "modern standby" just does not work. The battery drain is large even on ubuntu.
Hibernate is not an option as my SSD is 128Gb.
I did tests in 11 hours battery charge dropped from 80% to 15%. This is unacceptable, considering my ThinkPad T440 lasts about a week in s3 sleep.
Here I was abscent for weekend, on Monday I came home and was shocked by this:
It just wastes electricity. I recently came across ThinkPad E15 gen 4, fairly new laptop and S3 sleep on windows 11 works just fine. I don't understand how this sleep mode was removed. I dont even see any advantages in this so called "modern sleep", I dont care whether my laptop wakes in 1 sec or 5 seconds, I wake laptop once or twice a day, the rest advantaged listed on some sites I see as disadvantages. Why would you want your laptop to suddenly wake up and discharge a battery, or restart and lose your work because some update appeared. Why would you want your laptop that you put to sleep to receive any email or notifications?? nonsense
(edited)
dellus1onal
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October 16th, 2025 16:12
so basically this feature "modern standby" has turned laptop with battery into latop without battery
dellus1onal
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October 16th, 2025 16:19
@user_72970a wrote: "That’s why enabling or disabling the option has no effect"
If this option exists in BIOS, does that mean that some at some point in time older BIOS versions supported S3 sleep?
(edited)