Hi all
i have a chinese 6 inch GPS running igo primo or igo 8. with dimka skin ( which i prefer) and i was hoping to find a setting which wakes up the unit when external power is connected and put unit in sleep mode when power is dis connected.
currently primo goes into sleep mode as well as igo 8 but igo 8 freezes when you try to wake it up.

Unfortunately, you are talking about a problem that has existed for a long, long time. There's really nothing that can be done such as with a sys.txt entry. Let me give you a brief overview. When a device is put to sleep, it breaks contact with the SD card and it loses the information that was temporarily "saved." To wake-up the device, the connection has to be re-established with the SD card and thus it starts all over again. Sorry but that's just the way it is.

Thanks for the quick reply , the gps i am using has all the software on internal flash memory as i dont use an sdcard. my old 4.3 chinese gps used to turn on when i put the car in reverse , as it has an av input for a reverse camera, the 6inch has also an av input but wont wake up when the car is in reverse . is there some thing that can be done with a firmware update??

It works on Primo? Then it is no device setting.
On older iGO's, this was a known problem, but on newer iGO's its should be corrected. Besides, the solution was using internal memory, no SD.
When it happens on newer iGO's, mostly a faster SD helps, unless the card reader is the weak link (too slow).

Sometimes changing a setting can be a solution.
Settings, like for power, can be set in sys.txt. Unfortunately, there is no documentation about the settings.
The sys.txt power settings for iGO are these:
[power]
skip_resume_process=0
skip_suspend_process=0
powermgm_state=0
power_off_mode=1
power_off_timeout=300
battery_warning_limit=10
override_battery_values=???
backlight_sync_with_OS=0
backlight_slow_api=0
backlight_day=100
backlight_night=40

I know powermgm_state can be 0, 1, 2 or 3.
Most settings are 0=off, 1=on, battery and light is %, time is mlliseconds,
I suggest:

[power]
skip_resume_process=1
skip_suspend_process=1

But I am not sure if it will resolve your question.

FWIW

[interface]
shutdown_time=10

delays the shutdown to 10 sec when disconnected from power.

The problem with some (not all) PNA's is that when the device is suspended the processor stops to save battery, so software cannot wake up the device, There would need to be a hardware trigger like AC power or a camera feed, There are registry entries to control the processors sleep state but i haven't been able to make these work on my device. And they would reduce battery life while suspended.