Method and apparatus to optimize system battery-life while preventing disruptive user experience during system suspend

• US 9,092,220 B2
• Filed: 09/30/2011
• Issued: 07/28/2015
• Est. Priority Date: 08/22/2011
• Status: Active Grant

• Current Assignee: NVIDIA Corporation
• Original Assignee: NVIDIA Corporation
• Inventors: Wyatt, David, Jacoby, Rambod
• Primary Examiner(s): Cleary, Thomas J
• Assistant Examiner(s): Daley, Christopher A
• Application Number:
  US13/251,195
• Publication Number:
  US 20130054998A1
• Time in Patent Office: 1,397 Days
• Field of Search: 713/321, 713/322, 345/501, 345/522
• US Class Current: 1/1
• CPC Class Codes: G06F 1/3206 Monitoring of events, devices or parameters that trigger a change in power modality
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092
• CPC Class Codes: G09G 5/005 Adapting incoming signals to the display format of the display terminal
• CPC Class Codes: G09G 5/363 Graphics controllers
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A computer system comprising a graphics processor, a frame buffer, a display device, a system agent operable to detect an absence of active software applications and system configurations capable of rendering a disruptive user experience during system suspend, and a memory for storing instructions, that when executed perform a method of entering a power conservation state. The method comprises detecting a system idle event, activating the frame buffer, and storing display information in the frame buffer from the graphics processor. The method further comprises initiating a power reduction state for the graphics processor, self-refreshing the display device during the power reduction state with the display information stored in the frame buffer, and initiating a system suspend comprising a power reduction state for the computer system provided the system agent detects the absence of disruptive software and system configurations.

Claims

1. A computer system comprising:

a graphics processor;

a local frame buffer;

a display device;

a system agent operable to detect an absence of active software applications and system configurations capable of rendering a disruptive user experience during system suspend, wherein a disruptive user experience comprises a user input on resume; and

a memory for storing instructions, that when executed by the computer system perform a method of entering a power conservation state, the method comprising;

detecting a system idle event;

activating the local frame buffer;

storing display information in the local frame buffer from the graphics processor;

initiating a power reduction state for the graphics processor;

self-refreshing the display device during the power reduction state for the graphics processor with the display information stored in the local frame buffer; and

initiating a system suspend comprising a power reduction state for the computer system provided the system agent detects the absence of disruptive software and system configurations.

2. The computer system of claim 1, wherein the system idle event occurs when the computer system has been idle for a first prescribed length of time.

3. The computer system of claim 1 comprising input devices, and wherein at least one input device of the said input devices remains active during the power conservation state.

4. The computer system of claim 3, wherein the method further comprises exiting the power conservation state when the computer system receives an input from at least one input device.

5. The computer system of claim 1, wherein the system agent is operable to wake the computer system from system suspend to system resume and takes as input a plurality of user selectable periodicities comprising:

a first time interval during which the computer system is idle after which system suspend is initiated, a second interval during which the computer system is suspended after which the computer system awakens from system suspend, and a third time interval during which the computer system remains awake to perform work updates, before re-entering system suspend for another second interval.

6. The computer system of claim 5 further comprising a system timer operable to count the first time interval and the second time interval, and wherein the system timer is operable to trigger an entry into, and to wake from, system suspend.

7. The computer system of claim 5, wherein waking from system suspend after the second interval also causes a timed exit from self-refreshing the display device, wherein applications update and updated content is sent by the graphics controller to the display device during the timed exit from self-refreshing the display device.

8. The computer system of claim 7, wherein after waking from system suspend, a second timer counts the third time interval which on expiration causes re-entry into the self-refreshing the display device and re-entry into system suspend if no user input is detected.

9. The computer system of claim 8 further comprising proximity detectors, wherein the method further comprises evaluating the user proximity detectors after waking from system suspend and incrementing a counter when an absence of a user is detected and resetting the counter when a presence of the user is detected.

10. The computer system of claim 9, wherein the method further comprises:

reducing backlight power to dim the display device when the counter reaches a first threshold count;

disabling the display device when the counter reaches a second threshold count; and

exiting self-refreshing the display device and placing the computer system in system suspend when the counter reaches a third threshold count.

11. The computer system of claim 1, wherein the method further comprises exiting self-refreshing the display device and placing the computer system in system suspend upon detecting an instruction to enter system suspend.

12. The computer system of claim 1, wherein the system agent comprises a software agent.

13. The method of claim 12, wherein system suspend is not applied while any active software applications and system configurations are present.

14. A method of a computer system entering a power conservation state, the method comprising:

detecting a system idle event of the computer system;

detecting an absence of active software applications and system configurations capable of rendering a disruptive user experience during a system suspend, wherein a disruptive user experience comprises a user input on resume;

activating a local frame buffer;

storing display information in the local frame buffer from a graphics processor;

initiating a power reduction state for the graphics processor;

self-refreshing a display device during the power reduction state for the graphics processor with the display information stored in the local frame buffer; and

initiating the system suspend comprising a power reduction state for the computer system provided the system agent detects the absence of disruptive software and system configurations.

15. The method of claim 14, wherein the system idle event occurs when the computer system has been idle for a first prescribed length of time.

16. The method of claim 14 further comprising exiting the power conservation state when the computer system receives an input from at least one input device.

17. The method of claim 14, further comprising:

initiating system suspend after a first time interval;

waking from system suspend with system resume after a second time interval; and

reinitiating system suspend after a third time interval.

18. The method of claim 17, wherein waking from system suspend after the second interval also causes a timed exit from self-refreshing the display device, wherein applications update and updated content is sent by the graphics controller to the display device during the timed exit from self-refreshing the display device.

19. The method of claim 17 further comprising:

evaluating proximity detectors after exiting from system suspend and incrementing a counter when an absence of a user is detected and resetting the counter when a presence of the user is detected and;

reducing backlight power to dim the display device when the counter reaches a first threshold count;

disabling the display device when the counter reaches a second threshold count; and

exiting self-refreshing the display device and placing the computer system in system suspend when the counter reaches a third threshold count.

20. The computer system of claim 14, wherein system suspend is not initiated when active software applications or system configurations are present.