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I updated my ubuntu to 15:04 , but after que I can no longer reduce brightness. Even when I try with FN keys, the indicator varies, but the brightness doesn't change.

I've tried many ways to change the brightness, but nothing works. Seems like the video drivers doesn't response to command.

It may be helpful:

~$ ls /sys/class/backlight/
intel_backlight

20-intel.conf:

Section "Device"
    Identifier  "card0"
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
    BusID       "PCI:0:2:0"
EndSection

About my laptop: 

~$ lspci -k | grep -EA2 'VGA|3D'

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core
processor Graphics Controller (rev 09)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Device 2032
Kernel driver in use: i915

Graphics: Intel® Ivybridge Mobile
Model: Positivo Unique S1991i

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11
  • please edit and add output of sudo gedit /etc/default/grub
    – Ravan
    Sep 9, 2015 at 4:31
  • The file opened is empty.
    – JLuann
    Sep 9, 2015 at 4:34
  • refer here and here
    – Ravan
    Sep 9, 2015 at 4:36
  • I've saw this, but the file is empty. Can build this file or something like this?
    – JLuann
    Sep 9, 2015 at 4:45
  • Try this but I'm not sure! and this may help!
    – Ravan
    Sep 9, 2015 at 4:48

1 Answer 1

Reset to default
0

Run in terminal

sudo -H gedit /usr/share/X11/xorg.conf.d/20-intel.conf

The editor will open. Post there this text

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

Save the file and reboot.

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2
  • I've tried this already. It doesn't work too.
    – JLuann
    Sep 9, 2015 at 10:24
  • And what is your laptop?
    – Pilot6
    Sep 9, 2015 at 10:25

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