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Bug 1694349 - Monitor blanks but backlight does not turn off
Summary: Monitor blanks but backlight does not turn off
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: gnome-power-manager
Version: 29
Hardware: Unspecified
OS: All
unspecified
unspecified
Target Milestone: ---
Assignee: Richard Hughes
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-03-30 17:04 UTC by Steevithak
Modified: 2019-03-30 17:04 UTC (History)
7 users (show)

Fixed In Version:
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Description Steevithak 2019-03-30 17:04:51 UTC
Description of problem:
I'm running Fedora 29 on an Intel NUC8i7BEH with a Dell U2718Q 4k monitor (connected via HDMI). When Gnome blanks the screen after the computer has been idle a while, the screen does go black, however the LCD panel's backlight remains on at full brightness. I've been unable to find any obvious setting that would affect this but it seems like the backlight should turn off and the monitor should be powered down when idle.

Version-Release number of selected component (if applicable):
Fedora 29

How reproducible:
Always

Steps to Reproduce:
1. Install Fedora 29 on Intel NUC8i7BEH connected to a DELL U2718Q 4k monitor with an HDMO cable
2. Allow system to be idle until screen saver/blanker activates
3.

Actual results:
Monitor goes black but the backlight remains on, drawing power, and letting a fair amount of light into the room

Expected results:
When idle, the monitor should be blanked, the backlight should be turned off, and the monitor should be powered down

Additional info:
I have checked to see if the backlight and monitor power are turned down after a longer delay than the screen blanking itself but even letting it go all night didn't do it. The backlight was still on the next morning.


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