Hi Pat, 
No, autobrightness is still disabled.
I think it only appears when the phone is running on battery. (battery in 
unloading state). 
It never happened when on cable and battery load was under 98%. On cable it 
seems only to happen when fully loafed. On battery it is happening between 
immediately after boot and several hours of using the phone.
Once it happened it is impossible to use the phone after reboot until it's 
a bit unloaded and connected to a cable. Otherwise it just boots into a 
black screen.

Maybe it has something to do with the issue that the powerd is not able to 
read the current battery load state on mx4 besides the percentage state.

Best regards,
Stefan

Am Dienstag, 7. Juni 2016 22:10:00 CEST schrieb Pat McGowan 
<[email protected]>:
> If disabling autobrightness fixed it per comment #6 there is 
> some chance its related to a defective sensor.
> Did you re-enable autobrightness and is that how the issue recurred?
> 
> FWIW I do not see anything unusual in the last syslog
> 


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Mit Dekko von meinem Ubuntu-Gerät gesendet

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to powerd in Ubuntu.
https://bugs.launchpad.net/bugs/1582337

Title:
  sudden black screen

Status in Canonical System Image:
  Confirmed
Status in powerd package in Ubuntu:
  Confirmed

Bug description:
  When working on MX4 the screen (backlight?) suddenly becomes black.
  For example whilst playing balls, browsing, aso, the backlight seems
  to turn off so that you can hardly see anything. A reboot does not
  reset the backlight. You need to shut down the phone and start it
  again. In a dark room you are able to see the dialogues. In daylight
  it's impossible.

  Issue occured first times a week ago, sometimes it occures four times
  a day, some days just once.

  Phone MX4, stable, 10.1 (2016-0408-211605)

To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1582337/+subscriptions

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