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[Bug 1545266] Re: screen brightness slider has no effect


Supposedly this is answered, but I think it was because of the duplication.  

Here's the output of this command

$sudo dmidecode -t 1; lsb_release -a; uname -a

# dmidecode 2.12
SMBIOS 2.7 present.

Handle 0x0001, DMI type 1, 27 bytes
System Information
 Manufacturer: Dell Inc.
 Product Name: OptiPlex 7010
 Version: 01
 Serial Number: .............
 UUID: ,,,,,,,,,,,,,,,,,,
 Wake-up Type: Power Switch
 SKU Number: OptiPlex 7010
 Family: Not Specified

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
Linux kevin-desktop 3.19.0-49-generic #55~14.04.1-Ubuntu SMP Fri Jan 22 11:24:31 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

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  screen brightness slider has no effect

Status in unity-control-center package in Ubuntu:

Bug description:
  Trusty Tahr 14.04 LTS, seems to be fully updated

  f.lux also has no effect.

  Also when i try to do
   sudo echo 50 > /sys/class/backlight/acpi_video0/brightness
  then it says 'bash: brightness: permission denied'.
  (From this page: http://pastebin.com/HzzHrS2g).

  product: OptiPlex 7010 (OptiPlex 7010)

            description: CPU
            product: Intel(R) Core(TM) i3-3240 CPU @ 3.40GHz
            description: Host bridge
            product: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
            vendor: Intel Corporation
               description: VGA compatible controller
               product: Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller

  I would love to help provide some more help on my dual monitor setup.
  I found this documentation: https://wiki.ubuntu.com/X/Config/Resolution
  It says I should run $gnome-display-properties. Seems to be out of date. 
  gnome-display-properties: command not found

  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.

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