User Power Experience: Difference between revisions

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This is an attempt at describing the different power states provided by the different OLPC devices.

=Power States=

The following table tries to describe what parts of a particular device are powered in a given state.


{| class="wikitable" style="text-align:center"
{| class="wikitable" style="text-align:center"
! State !! Run !! Idle !! Screensaver !! Sleep !! Off
! State: !! Run !! Idle !! Screen Saver !! Sleep !! Off !! Notes
|-
|-
! XO-1
! colspan="7" | XO-1
|-
|-
! Proc
! Proc || X || || || || ||
| X || || || || ||
|-
|-
! Memory
! Display || X || X || || || ||
| X || X || X || X || ||
|-
! Display
| X || X || || || ||
|-
! Audio
| X || || || || ||
|-
! Kbd/Tpd
| X || X || X || X || ||
|-
! WLAN
| X || X || X || X || || non-ideal
|-
! USB
| X || || || || ||
|-
! State: !! Run !! Idle !! Screen Saver !! Sleep !! Off !! Notes
|-
! colspan="7" | XO-1.5
|-
! Proc
| X || || || || ||
|-
! Memory
| X || X || X || X || ||
|-
! Display
| X || X || || || ||
|-
! Audio
| X || || || || ||
|-
! Kbd/Tpd
| X || X || X || X || || non-ideal
|-
! WLAN
| X || X || X || || ||
|-
! USB
| X || || || || || non-ideal
|-
! State: !! Run !! Idle !! Screen Saver !! Sleep !! Off !! Notes
|-
! colspan="7" | XO-1.75
|-
! Proc
| X || X || X || X || || enters low power mode when not running
|-
! Memory
| X || X || X || X || ||
|-
! Display
| X || X || || || ||
|-
! Audio
| X || X || X || || ||
|-
! Kbd/Tpd
| X || X || X || || ||
|-
! Touchscreen
| X || X || X || || ||
|-
! WLAN
| X || X || X || || ||
|-
! USB
| X || X || X || || ||
|-
! State: !! Run !! Idle !! Screen Saver !! Sleep !! Off !! Notes
|-
! colspan="7" | iPad
|-
! Proc
| X || X || na || X || ||
|-
! Memory
| X || X || na || X || ||
|-
! Display
| X || X || na || || ||
|-
! Audio
| X || X || na || X || ||
|-
! WLAN
| X || X || na || X || || bcast only ?
|-
|-
|}
|}

=Terms=

===Run===
This state is when the laptop is actively computing.

===Idle===
This state is when the laptop is not actively computing, and it has seen no recent (last minute) user input or network activity. In the XO-1 and XO-1.5, due to the high idle power of the x86 implementations, we ''suspend'' in the Idle state (powering off the processor).

===Screen Saver===
This state is when the laptop has seen no recent user activity. It should actually be orthogonal with Idle...

===Sleep===
===Off===

===Devices===
The following are the devices described in the tables:

====Proc====
Processor refers to both the actual central processing unit of the laptop, as well as the graphics subsystem and clock generator feeding the CPU and other subsystems.

====Memory====
Memory refers to the laptop's volatile storage.

====Display====
Display refers to the entire display subsystem, including the DCON (used to maintain a displayed image when the processor is powered off.

====Audio====
====Kbd/Tpd====
This refers to the keyboard and touchpad provided on the laptop.

====WLAN====
This is the wireless networking unit.

====Touchscreen====
====USB====

Latest revision as of 00:45, 11 January 2011

This is an attempt at describing the different power states provided by the different OLPC devices.

Power States

The following table tries to describe what parts of a particular device are powered in a given state.

State: Run Idle Screen Saver Sleep Off Notes
XO-1
Proc X
Memory X X X X
Display X X
Audio X
Kbd/Tpd X X X X
WLAN X X X X non-ideal
USB X
State: Run Idle Screen Saver Sleep Off Notes
XO-1.5
Proc X
Memory X X X X
Display X X
Audio X
Kbd/Tpd X X X X non-ideal
WLAN X X X
USB X non-ideal
State: Run Idle Screen Saver Sleep Off Notes
XO-1.75
Proc X X X X enters low power mode when not running
Memory X X X X
Display X X
Audio X X X
Kbd/Tpd X X X
Touchscreen X X X
WLAN X X X
USB X X X
State: Run Idle Screen Saver Sleep Off Notes
iPad
Proc X X na X
Memory X X na X
Display X X na
Audio X X na X
WLAN X X na X bcast only ?

Terms

Run

This state is when the laptop is actively computing.

Idle

This state is when the laptop is not actively computing, and it has seen no recent (last minute) user input or network activity. In the XO-1 and XO-1.5, due to the high idle power of the x86 implementations, we suspend in the Idle state (powering off the processor).

Screen Saver

This state is when the laptop has seen no recent user activity. It should actually be orthogonal with Idle...

Sleep

Off

Devices

The following are the devices described in the tables:

Proc

Processor refers to both the actual central processing unit of the laptop, as well as the graphics subsystem and clock generator feeding the CPU and other subsystems.

Memory

Memory refers to the laptop's volatile storage.

Display

Display refers to the entire display subsystem, including the DCON (used to maintain a displayed image when the processor is powered off.

Audio

Kbd/Tpd

This refers to the keyboard and touchpad provided on the laptop.

WLAN

This is the wireless networking unit.

Touchscreen

USB

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