Ubuntu
gnome-shell package

Able to set brightness to zero

Bug #1686579 reported by Robert Ancell
14
This bug affects 3 people
Affects Status Importance Assigned to Milestone
GNOME Settings Daemon
Confirmed
Wishlist
gnome-shell (Ubuntu)
Triaged
Medium
Unassigned

Bug Description

Using the slider in the status menu I'm able to set the brightness of my display to zero. Then the screen is completely black and not possible to find the slider again.

Revision history for this message
Robert Ancell (robert-ancell) wrote :

I don't know if this is a driver issue or GNOME shell should have a lower limit on brightness (e.g. 10%).

Changed in gnome-shell (Ubuntu):
importance: Undecided → Medium
status: New → Triaged
Revision history for this message
Jeremy Bícha (jbicha) wrote :

I can duplicate this bug with Intel graphics.

Jeremy Bícha (jbicha)
tags: added: gnome-1710
Jeremy Bícha (jbicha)
tags: added: gnome-17.10
removed: gnome-1710
Revision history for this message
Jeremy Bícha (jbicha) wrote :

Robert, is this actually a gnome-settings-daemon bug (or even as https://bugzilla.gnome.org/782155 implies, a kernel bug)?

Do you experience the same problem in Unity?

Bug Watch Updater (bug-watch-updater)
Changed in gnome-settings-daemon:
importance: Unknown → Wishlist
status: Unknown → Confirmed
Daniel van Vugt (vanvugt)
tags: added: brightness
Revision history for this message
Robert Ancell (robert-ancell) wrote :

This doesn't occur in Unity - the lowest setting is dark but still visible.

Revision history for this message
Kai Mast (kai-mast) wrote :

I don't have this bug but I think it is a feature and I want it.

Is there a way to manually modify the lower bound for the brightness level?

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

AFAIK, the lower bound is machine-dependent. Same software, different hardware, different lower bound. Some machines can achieve full blackness already, and others can't. It's always been this way...

So that also suggests this is a kernel issue. If you want it changed for your particular machine type then a kernel change would probably be necessary.

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