For me it seems, that the 1.1.1.27 has an sideeffekt to the proxymity sensor. I always have the settings 'Display off when active' and 'Proximity' checked.
Before the sailfishos update i'm sure you could activate the oled by the proximity sensor like a switch. Now sometimes i have longer response times than before until the point where it doesn't act anymore .
(journalctl - f out of the box reports nothing about the proximity sensor state)
devel-su journalctl -f | grep toholed
tammi 25 11:48:38 Jolla harbour-toholed[28808]: Interrupt: Proximity detect: ALS C0 8 C1 3 prox 1011 tammi 25 11:48:38 Jolla harbour-toholed[28808]: Interrupt: Proximity cleared: ALS C0 1 C1 0 prox 808 tammi 25 11:48:39 Jolla harbour-toholed[28808]: Interrupt: Proximity detect: ALS C0 0 C1 0 prox 1023 tammi 25 11:48:39 Jolla harbour-toholed[28808]: Interrupt: Proximity cleared: ALS C0 6 C1 2 prox 600 tammi 25 11:48:39 Jolla harbour-toholed[28808]: Interrupt: Proximity detect: ALS C0 6 C1 2 prox 1023
tammi 25 12:01:22 Jolla harbour-toholed[17903]: Interrupt: Auto brightness adjust: ALS C0 1508 C1 318 prox 583 tammi 25 12:01:24 Jolla harbour-toholed[17903]: Interrupt: Auto brightness adjust: ALS C0 36 C1 9 prox 583 tammi 25 12:01:24 Jolla harbour-toholed[17903]: Interrupt: Auto brightness adjust: ALS C0 1157 C1 241 prox 581 tammi 25 12:01:25 Jolla harbour-toholed[17903]: Interrupt: Auto brightness adjust: ALS C0 34 C1 9 prox 578
tammi 25 11:58:19 Jolla harbour-toholed[17903]: EEPROM parameter 0 value 901