M src/battery/linux.c → src/battery/linux.c

@@ -306,6 +306,7 @@ gsize datalen;
 
 	gint64 old_timestamp = bat->timestamp;
 	int old_energy_now = bat->energy_now;
+	gint old_power_now = bat->power_now;
 
 	/* reset values */
 	bat->present = 0;
@@ -356,6 +357,12 @@ if (g_error_matches(error, G_FILE_ERROR, G_FILE_ERROR_NODEV)) {
 		/* some hardware does not support reading current power consumption */
 		g_error_free(error);
 		bat->power_now = estimate_power_usage(bat, old_energy_now, old_timestamp);
+		if (bat->power_now == 0 && bat->status != BATTERY_FULL) {
+			/* If the hardware updates the level slower than our sampling period,
+			 * we need to sample more rarely */
+			bat->power_now = old_power_now;
+			bat->timestamp = old_timestamp;
+		}
 	} else if (error) {
 		g_error_free(error);
 		return FALSE;