Problems after resuming from sleep

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Lekro4

Reputable
Jan 5, 2016
13
0
4,510
Hello,

I have a strange and a bit dangerous issue with resuming from sleep mode.
Here are my specs first:
Asus Z97-K with latest bios
Intel i5 4690k@Stock 3,5Ghz with Stock cooler
Asus STRIX GTX 970 with latest drivers
8GB Kingston HyperX Fury 1600Mhz(1 stick)
1TB WD Blue HDD
120GB Kingston SSD
Samsung DVD-RW Drive
Cooler Master Elite Power 600W
Cooler Master K350 Case
Windows 10 Pro x64

The problem is, sometimes(rarely but still very randomly), after waking the PC up from sleep mode the CPU Fan will not spin up.
Every other fan, my front intake and the rear exhaust fan spin up correctly, even the VGA fans do work.

The symptons are not this easy tho. During a normal boot the CPU fan spins up to max then slows down to around 1000RPM within seconds then adjusts the RPM according to load, which is working perfectly.

After resuming from sleep however, the fan spins up to max then slows down until it stops completely, 1-2 seconds later spins up to max again, etc. It is going on endlessly until I shut down, reboot or even try the sleep mode again.

This is the better occasion. The worst is when it never tries to spin up again, just once. Yesterday I didn't notice the problem and started a game and the PC cut power completely after a few seconds in the game due to overheating.

I'm now scared to use sleep mode because it could happen any day again. Sometimes it doesn't happen for days or even weeks.

Only thing I can make a connection with is that, 2 times it happened after being in sleep mode for a very short amount of time (few minutes).


Also I'm scared to keep testing with sleep mode as I don't want to corrupt my OS with the pc cutting power.


Thanks in advance,
Lekro
 
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Shaun o

Shaun o

Illustrious
Oct 7, 2007
6,113
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41,960
Any device,or anything that fails to resume it`s normal operation after waking from sleep mode set through windows.

Is down to the incorrect power mode settings that are set in your bios of the motherboard you have.

In your bios you should have Acpi mode options from S1 to S5.

S1/S3 mode is the one I use but S1/S4 can be used if you wish to retain data in case of a power cut to the system.
Where as all data will be lost from system memory with S1/S3 mode selected.

S1/S3 mode is quicker at system wake up, and resume from sleep state.


Here is a list of what each S mode setting does if selected in your bios from the power section of the bios menus.

S1, Power on Suspend (POS): Processor caches are flushed, and the CPU(s) stops executing instructions. The power to the CPU(s) and RAM is maintained. Devices that do not indicate they must remain on may be powered off.
S2: CPU powered off. Dirty cache is flushed to RAM.
S3, commonly referred to as Standby, Sleep, or Suspend to RAM (STR): RAM remains powered.
S4, Hibernation or Suspend to Disk: All content of the main memory is saved to non-volatile memory such as a hard drive, and the system is powered down.
G2 (S5), Soft Off: G2/S5 is almost the same as G3 Mechanical Off, except that the power supply unit (PSU) still supplies power, at a minimum, to the power button to allow return to S0. A full reboot is required. No previous content is retained. Other components may remain powered so the computer can "wake" on input from the keyboard, clock, modem, LAN, or USB device.
 
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