Power Management Tips: Difference between revisions
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= Power Management Tips and Tricks = |
== Power Management Tips and Tricks == |
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These are tips and tricks for saving power on the XO platform. |
These are tips and tricks for saving power on the XO platform. |
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== Lid events == |
=== Lid events === |
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Starting with the B2 platform, we now have the capability to get events when the lid is closed and opened. The events can be collected along with the power button event from the geode_pm input device. |
Starting with the B2 platform, we now have the capability to get events when the lid is closed and opened. The events can be collected along with the power button event from the geode_pm input device. |
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== DCON sleep == |
=== DCON sleep === |
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The DCON can be put to sleep (ie - blanked). This is useful for those times when the system should stay up, but the DCON is drawing too much power. To put it to sleep: |
The DCON can be put to sleep (ie - blanked). This is useful for those times when the system should stay up, but the DCON is drawing too much power. To put it to sleep: |
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This is particularly useful when combined with the lid events (above). |
This is particularly useful when combined with the lid events (above). |
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[[Category:Software development]] |
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Revision as of 16:34, 26 March 2007
Power Management Tips and Tricks
These are tips and tricks for saving power on the XO platform.
Lid events
Starting with the B2 platform, we now have the capability to get events when the lid is closed and opened. The events can be collected along with the power button event from the geode_pm input device. Here is a bit of pseudo code for doing that:
#include <linux/event.h>
struct input_event ev;
input_fd = open("/dev/input/event0", O_RDONLY);
read(input_fd, &event, sizeof(struct input_event));
if (ev.type == EV_SW && ev.code == SW_LID) {
if (ev.value == 1)
lid_down();
else
lid_up();
}
DCON sleep
The DCON can be put to sleep (ie - blanked). This is useful for those times when the system should stay up, but the DCON is drawing too much power. To put it to sleep:
echo "1" > /sys/devices/platform/dcon/sleep
and to wake back up:
echo "0" > /sys/devices/platform/dcon/sleep
This is particularly useful when combined with the lid events (above).