PowerD: Make sure we immediately display accurate battery capacity on

resume.

(MONOTONIC doesn't trick during suspend, so we could happily display the
pre-suspend capacity for a while).

frontend/device/generic/powerd.lua

@@ -191,6 +191,11 @@ function BasePowerD:getAuxCapacity()
     return self.aux_batt_capacity
 end
 
+function BasePowerD:invalidateCapacityCache()
+    self.last_capacity_pull_time = TimeVal:new{ sec = 0, usec = 0}
+    self.last_aux_capacity_pull_time = TimeVal:new{ sec = 0, usec = 0}
+end
+
 function BasePowerD:isAuxCharging()
     return self:isAuxChargingHW()
 end

frontend/ui/uimanager.lua

@@ -1792,6 +1792,10 @@ Executes all the operations of a resume (i.e., wakeup) request.
 This function usually wakes up the device.
 ]]
 function UIManager:resume()
+    -- MONOTONIC doesn't tick during suspend,
+    -- invalidate the last battery capacity pull time so that we get up to date data immediately.
+    Device:getPowerDevice():invalidateCapacityCache()
+
     if Device:isCervantes() or Device:isKobo() or Device:isSDL() or Device:isRemarkable() or Device:isSonyPRSTUX() then
         self.event_handlers["Resume"]()
     elseif Device:isKindle() then