Description of problem:

When I lock the screen, my display says "entering power save mode", then turns off for a fraction of a second (the status led goes from blue to yellow), then the backlight immediately turns back on(status led goes blue) and display says "entering power save mode" again. This repeats infinitely. No picture is shown on the display (I only see backlight cycling off and on)

Version-Release number of selected component (if applicable):


How reproducible:

always

Steps to Reproduce:
1. lock screen
2.
3.

Actual results:

the display does not sleep rather is in wake-sleep cycle

Expected results:

the display should sleep
Additional info: