screen brightness slider has no effect
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
unity-control-center (Ubuntu) |
New
|
Undecided
|
Unassigned |
Bug Description
Trusty Tahr 14.04 LTS, seems to be fully updated.
The problem is: When I go to System Settings -> Brightness & Lock, the slider has no effect. I can decrease the brightness slider to any level and the actual brightness of the monitors apparently does not change in any way.
f.lux - I was saying this doesn't work either, but I found out it doesn't really install correctly, and it gives error messages when I try to start it, so that doesn't mean much. redshift does work, so my monitors are not completely insensitive or broken ...
Also when i try to do
echo 50 | sudo tee /sys/class/
it has no effect
product: OptiPlex 7010 (OptiPlex 7010)
*-cpu
product: Intel(R) Core(TM) i3-3240 CPU @ 3.40GHz
*-pci
product: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
vendor: Intel Corporation
*-display
I would love to help provide some more help on my dual monitor setup.
I found this documentation: https:/
It says I should run $gnome-
gnome-display-
I guess it would be annoying to say it's a security vulnerability although if my screen isn't dim someone could more easily look through the window and see what I am typing on the screen.
description: | updated |
Changed in unity-control-center (Ubuntu): | |
status: | Incomplete → New |
Hi Kevin,
I do not know much about this topic, but...
On 2016-02-13 13:03, Kevin Leeds wrote: backlight/ acpi_video0/ brightness pastebin. com/HzzHrS2g).
> Also when i try to do
> sudo echo 50 > /sys/class/
> then it says 'bash: brightness: permission denied'.
> (From this page: http://
That command would need to be changed to e.g.:
sudo sh -c 'echo 50 > /sys/class/ backlight/ acpi_video0/ brightness'
> I would love to help provide some more help on my dual monitor setup.
Did you see these pages in the official documentation:
https:/ /help.ubuntu. com/stable/ ubuntu- help/display- dual-monitors- desktop. html
https:/ /help.ubuntu. com/stable/ ubuntu- help/display- dual-monitors. html