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Bug: Display stays black on alarm-clock ringing, even after double tapping and power key using

asked 2014-01-10 00:14:53 +0300

szobi gravatar image

updated 2014-07-22 11:10:15 +0300

jiit gravatar image

This morning my Jolla went into a strange bug. My alarm-clock was ringing and waking me up, but the display stayed black. I tried double tapping, using the power button and the pulley gesture multiple times, but nothing happend. The device seemed to be frozen. I noticed that the small red LED in the top right corner was illuminated, telling me the device is busy. So, I waited for a while, but the busy-LED didn't stop illuminating.

I used long push on power button to restart my Jolla. After restart the alarm came up again and this time everything worked well.

At the time my alarm-clock was ringing the first time only a few small native apps were running and all network connections were turned off. But before I went to bed, I tried two android games from humble bundle. It could have been a bit CPU and memory intensive. The two games worked well. They run one after the other (not at the same time) and both were quitted correctly.

Maybe the cause for this is something similar also causing this issue.


On the next morning everything worked like a charm. This time I didn't use Android games before going to bed. I will try to reproduce the bug by using the Android games again. Let's see, if it is reproducible.

Anybody else having a similar problem with his/her device?

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I have also had this happen once but I haven't been able to reproduce it either so it's probably some obscure timing issue.

euj ( 2014-01-10 11:24:51 +0300 )edit

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answered 2015-06-23 13:12:43 +0300

spiiroin gravatar image

Most likely cause: Sensor area is dirty and proximity sensor the is incorrectly reporting "covered".

When alarm is ringing, the display should turn on as soon as proximity sensor is not covered. Normal power key presses do not turn on the display, since they are reserved for snoozing the alarm at this stage.

If wiping the light/proximity sensor area (at the top-right corner of the display - nearest to the power key), does not help, you can do triple powerkey press -> forces proximity sensor tracking "not-covered" state -> display should turn on (although the alarm does get snoozed already on the 1st press).

n.b. The "small red LED" mentioned is actually proximity sensor infrared transmitter, not a busy indicator.

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@spiiroin Thank you for clarification and some new hints. :-) Since I had this problem only once and it was nearly one and a half year ago, I guess it was actually a bug and the bug was possibly fixed in the meantime. Otherwise pressing the power button (I tried it several times before restarting the device) had snoozed the alarm as you described.

szobi ( 2015-06-24 14:42:43 +0300 )edit
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Asked: 2014-01-10 00:14:53 +0300

Seen: 169 times

Last updated: Jun 23 '15