Screen on time

answered 2018-10-28 21:26:40 +0200

spiiroin
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  moderator

updated 2018-10-28 22:59:14 +0200

You can query display state statistics from mce service.

Either with mcetool

mcetool --get-display-stats=human

or directly from D-Bus with equivalent of:

dbus-send --system --type=method_call --print-reply --dest=com.nokia.mce /com/nokia/mce/request com.nokia.mce.request.get_display_stats

EDIT:

The output has three values: display state name, total time spent in that state, and number of times the state has been entered.

The sum of time values should be equal to uptime. Time before currently running mce process was started ends up calculated in "UNDEF". Normally mce starts early in bootup and keeps running until the device shuts down, so the undefined time should be fairly small and static. POWER_UP and POWER_DOWN are transient states which occur when the display is physcally being powered up / down. Normally POWER_UP is followed by ON state, and POWER_DOWN is followed by OFF state. But if "lpm" mode is enabled, the display can be physucally powered up for displaying lpm screen while it logically (from application program point of view) is not actually ON.

The entry-to-state-count numbers go something like:

• Pressing power key when display is off: OFF -> POWER_UP -> ON. The counts for POWER_UP and ON should increase by one.
• Pressing power key when display is on: ON -> POWER_DOWN -> OFF. The counts for POWER_DOWN and OFF shoud increase by one.
• Display is on, gets dimmed by auto blanker, and woken up due to user activity: ON -> DIM -> ON. DIM and ON increase by one.
• Display is off, LPM enabled, device is taken out of pocket (to check time) and then put back into pocket: OFF -> POWER_UP -> LPM_ON -> POWER_DOWN -> LPM_OFF -> OFF. Like above, each state transition increases the target state count by one.