How to enable S1 sleep

Hi All,

My HP Desktop dc7800p is configured for S3 Sleep. I want to have both the S1 and S3 sleep states enabled. I tried changing the BIOS settings but there is only option for 'ACPI S3 Support - Enable/Disable'. How can I get the PC to goto S1 Hybrid Sleep. BIOS version - HP 786F1 v01.24

Output of 'powercfg -a'
The following sleep states are available on this system: Standby ( S3 ) Hibernate
The following sleep states are not available on this system:
Standby (S1)
Standby (S2)

Is there any other way to change the PC Power settings to support both S1 and S3 sleep such that the output of 'powercfg -a' gives the following?
The following sleep states are available on this system: Standby ( S1 S3 ) Hibernate
The following sleep states are not available on this system:
Standby (S2)

Can someone please help me in this regard?

Thanks,
PK
4 answers Last reply
More about enable sleep
  1. If the option is not available in BIOS, I think that you are out of luck.
  2. jsc said:
    If the option is not available in BIOS, I think that you are out of luck.

    Hi jsc,

    Does that mean the S1 state is not supported on this PC? The only options I could find under Power Management are -
    1. Runtime Power Management Enabled
    2. Idle Power Savings Extended
    3. ACPI S3 Support Enabled
    4. ACPI S3 Hard Disk Reset Disabled
    5. ACPI S3 PS2 Mouse Wake Up Enabled
    6. USB Wake On device insertion Disabled

    But, I dont find anything that says S1. I compared the settings with another PC which has both S1 and S3 supported and they were identical settings. The only difference I could find is the model of the PC - this one is HP desktop dc7800p and the other PC (which supports both S1 and S3) is HP desktop dc7500. So, I wanted to know if there is some other means by which I can get S1 enabled?

    Thanks,
    PK
  3. If you have nvidia products thats all it takes to break standby modes
  4. Have HP got ay newer BIOS available? might help.
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