[Q] Screen not unblanking
I bought a ZR 6 weeks ago, updated to android 4.3 with official Sony releases. It did not fall nor jump to water.
Everything ran fine, but it happens more and more that the screen suddenly turns black.
At the beginning, switching the phone to sleep and waking it up used to reactivate the screen; it tends not to work any more.
Under a low light the display can be guessed, but the screen itself brings absolutely no light.
I managed to enable the debug link under a low light, and here is what logcat shows me:
I/PowerManagerService( 772): Waking up from sleep...
I/QCOM PowerHAL( 772): Perflock released.
D/SurfaceFlinger( 320): Screen acquired, type=0 flinger=0xb7475150
D/qdhwcomposer( 320): hwc_blank: Unblanking display: 0
D/lights-module( 320): led 'backlight' opened 34 times
E/lights-utils( 314): Unable to write '1': Invalid argument
D/qdhwcomposer( 320): hwc_blank: Done unblanking display: 0
W/qdhwcomposer( 320): Excessive delay reading vsync: took 11728 ms
D/SurfaceControl( 772): Excessive delay in unblankDisplay() while turning screen on: 169ms
I could find no information about this light-utils stuff.
What do I have to check or do?
Thanks a lot