At login, brightness goes to minimum, fastly goes back to maximum and didn't change anymore

Question

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

please edit and add output of sudo gedit /etc/default/grub — Ravan, Sep 09 '15 at 04:31
I've saw this, but the file is empty. Can build this file or something like this? — JLuann, Sep 09 '15 at 04:45
The first one i've tried doesn't works. And the app, the Ubuntu Software Center can't find, maybe because my ubuntu is 15.04 — JLuann, Sep 09 '15 at 04:53
See this: http://askubuntu.com/questions/618231/brightness-control-not-working-for-ubuntu-14-04/618240#618240 — Ron, Sep 09 '15 at 06:54
Please [edit] your question and add output of lspci -k | grep -EA2 'VGA|3D' terminal command. And also specify your laptop model. — Pilot6, Sep 09 '15 at 10:28
http://askubuntu.com/q/476664 I think this might be the solution. — scj643, Sep 23 '15 at 17:44

score 0 · Answer 1 · answered Sep 09 '15 at 10:04

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.

answered Sep 09 '15 at 10:04

Pilot6

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I've tried this already. It doesn't work too. – JLuann Sep 09 '15 at 10:24
And what is your laptop? – Pilot6 Sep 09 '15 at 10:25

At login, brightness goes to minimum, fastly goes back to maximum and didn't change anymore

1 Answers1