Return to Advanced Features

Advanced Power Management

ACPI Status

1. Collect information on ACPI status

   1. Run the following command for device information

    acpi -V 

   1. Run the following command for version information

    acpi -v 

S-State

1. Confirm the following state is supported

   1. Suspend to RAM, resume and check the keyboard, mouse, touchpad, video, USB, CDROM and network;
   2. Suspend to Disk, resume and check the keyboard, mouse, touchpad, video, USB, CDROM and network.

C-state

1. Confirm the following state is supported

   1. The every supported C-states can be entered on UP
   2. The every supported C-states can be entered on SMP.
   3. The C-states when AC adapter and battery are as power supplier
   4. The C-states change when switching between AC and Battery

P-state

1. Confirm the following state is supported

   1. Verify the performance governor: set to performance governor and check the frequencies of all the CPUS. It should be the maximum supported freq.
   2. Verify the powersave governor: set to powersave governor and check the frequencies of all the CPUS. It should be the minimum supported freq.
   3. Verify the userspace governor: set to userspace governor and make sure, that it is set properly; set to all possible frequencies and check whether it is set properly.
   4. Verify that the on-demand governor obeys the scaling max and min frequencies: set to ondemand governor and make sure it is set properly; Take all CPUs to idle and make sure the frequencies goes to the minimum; Keep all CPUs busy and make sure freq goes to the maximum.

T-state

1. Confirm the following state is supported

   1. T-state performance: observe any performance differences through the /sys/devices/system/cpu/cpu*/cpufreq/stats and /proc/acpi/processor/*/power during controlled workloads.