Apparatus and method for managing graphics buffers for a processor in sleep mode

An apparatus comprising:

• a display;
• a non-transitory memory;
• a primary processor;
• and
• a secondary processor,
• wherein the primary processor and the secondary processor are each operatively coupled to the non-transitory memory, and
• wherein the primary processor is configured to:
• execute a kernel comprising a display drive;
• execute a user space comprising one or more applications, the user space operative to register a graphics buffer with the kernel;
• store the registered graphics buffer in the non-transitory memory without outputting the graphics buffer for display;
• while the primary processor is in a sleep mode, receive, from the secondary processor of the apparatus, a wake command;
• responsive to receiving the wake command, perform at least a partial resume of the kernel while preventing an activation of the user space;
• and
• responsive to receiving a command associated with the registered graphics buffer from the secondary processor, output, using the display driver of the kernel, and for display, the graphics buffer without using an operating system graphics pipeline of the user space.

An apparatus comprising:

• a touchscreen display;
• a non-transitory memory;
• a primary processor configured to execute a kernel and a user space comprising one or more applications, the kernel comprising a display driver, and the user space operative to register a graphics buffer with the kernel;
• and
• a secondary processor,
• wherein the primary processor and the secondary processor are each operatively coupled to the non-transitory memory, and
• wherein the secondary processor is configured to:
• receive an indication of a user input detected at the touchscreen display to select a notification;
• responsive to receiving the indication of the user input, and while the primary processor is in a sleep mode, send a wake command to the primary processor to initiate at least a partial resume of the kernel while preventing an activation of the user space;
• and
• pass the registered graphics buffer to the display driver of the kernel.