Hi I resonantly installed Fedora 20 on my lap top ProBook 4540s. I am unable to control the display brightness among other issues that I am trying to figure out how to fix

Under /sys/class/backlight/ there is acpi_video0 and intel_backlight. If I use the keyboard shortcuts it goes and edit /sys/class/backlight/acpi_video0/brightness rather then /sys/class/backlight/intel_backlight/brightness causing it to have no effect on the backlight.

But from the command prompt if I do

echo 1500 > /sys/class/backlight/intel_backlight/brightness

and it works

How would I go about fixing this, the file

/etc/X11/xorg.conf

has 0 bytes and if I try to regenerate this by issuing Xorg :2 -configure

I end up with below error


X.Org X Server 1.14.4
Release Date: 2013-10-31
X Protocol Version 11, Revision 0
Build Operating System: 3.14.3-200.fc20.x86_64
Current Operating System: Linux localhost.localdomain 3.15.10-201.fc20.x86_64 #1 SMP Wed Aug 27 21:10:06 UTC 2014 x86_64
Kernel command line: BOOT_IMAGE=/vmlinuz-3.15.10-201.fc20.x86_64 root=UUID=80a24ce6-901b-4691-8163-b67b9fd59132 ro vconsole.font=latarcyrheb-sun16 rhgb quiet LANG=en_GB.UTF-8
Build Date: 27 June 2014 01:35:28AM
Build ID: xorg-x11-server 1.14.4-11.fc20
Current version of pixman: 0.30.0
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.2.log", Time: Mon Sep 15 11:58:15 2014
setversion 1.4 failed
List of video drivers:
mga
radeon
ati
nouveau
openchrome
intel
vmware
modesetting
qxl
vesa
fbdev
(++) Using config file: "/root/xorg.conf.new"
(==) Using config directory: "/etc/X11/xorg.conf.d"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
Number of created screens does not match number of detected devices.
Configuration failed.
(EE) Server terminated with error (2). Closing log file.


Thanks and Best Regards

There's probably a "right" way to do this, but personally I would just create a script that increments the values, and another that decrements, and then create custom key shortcuts to those scripts. Something like this:

http://www.mabishu.com/blog/2010/06/...untu-gnulinux/

Hi NotKlaatu, thanks for the reply, but it just took care of its own, I ran an update resonantly for some other issue that I was having. Only thing is drivers are not updated (still the same driver is been used) any how it is working

Thing is I dont know what was the fix! (if I ever had to reinstal my lap)

Thanks and best Regards