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Fedora 20 Cannot change display brightness/backlight on HP ProBook G3

asked 2018-05-19 19:57:43 -0500

fedhat gravatar image

I have recently started using Fedora 20 on an HP ProBook G3 laptop. Since my teammates are already using Fedora 20 on their PCs I had to go with it. I love working on Fedora, altho Gnome is a bit awkward coming from Ubuntu. Consider me as a beginner on linux. My problem is Im uanble to change the display or backlight brightness on the above laptop although it works fine when I boot into Windows 10. The slider to change brightness is not present and the Fn buttons are not working, when in Fedora 20. Given that I have to work on Fedora 20 without upgrading, how do I change the brightness level to a value I like in Fedora ?


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Maybe look at some of these answers?

felthat gravatar imagefelthat ( 2018-05-19 22:09:56 -0500 )edit

Forgot to add. I tried the instructions on that link. But changing the kernel boot parameters didnt do anything.

fedhat gravatar imagefedhat ( 2018-05-19 22:21:27 -0500 )edit

Before you spend to much time fixing and tweaking your Fedora 20 installation, I'd recommend you upgrading to a supported release of Fedora, currently F27 and F28. Fedora 20 is End-of-Lifesince many years and not supported with critical security updates anymore. You can get Fedora 28 from here:

florian gravatar imageflorian ( 2018-05-20 08:29:48 -0500 )edit

@florian, I'd luv to but my team is working on F20 and I dont want the binaries and libs to be inconsistent/incompatible. Actually I tried running F28 Live from a pen and it worked beautifully compared to F20. My question is, if linux is really open and can be tweaked any way you like, why not let me get this fixed with drivers/apps that I can find from the net. I mean wudnt it be just another recompile of code (for the drivers/apps) that works for F28 but on my laptop with F20 ? #juscurious

fedhat gravatar imagefedhat ( 2018-05-20 09:19:10 -0500 )edit

I think the gap between the technology of the machine and the older OS is to wide. Take a newer OS.

heliosstyx gravatar imageheliosstyx ( 2018-05-20 10:53:34 -0500 )edit

3 Answers

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answered 2018-05-21 21:59:08 -0500

sideburns gravatar image

One of the problems with getting answers to questions about old versions of Fedora is that most of the people here are running the latest versions and don't remember how things were done eight versions ago. You might do better by going to the Unofficial Fedora Forum and asking there, as they have a board that's dedicated to older versions that are past their End of Life.

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answered 2018-05-20 00:12:25 -0500

dylanthomas gravatar image

try adding

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


to /usr/share/X11/xorg.conf.d/20-intel.conf

and reboot

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have done that too. When I first tried that I created the file in /etc/X11/xorg.conf.d/ with the same parameters, but nothing worked. I couldn't even login and had to login from console (Alt+F4). When I tried your location, same thing - couldn't log in from front end. Had to login from terminal and delete the file. In both instances, after I logged in, there was no brightness slider, nor did the Fn keys worked to change brightness. What other methods should I try ? How can I debug this to see where it is giving the error ?

fedhat gravatar imagefedhat ( 2018-05-20 04:55:20 -0500 )edit

I'm curious if Xorg would even load the Intel driver if the hardware is newer? You may be running the VESA fallback driver. The log you are looking for should be at /var/log/Xorg.0.log

felthat gravatar imagefelthat ( 2018-05-21 08:18:12 -0500 )edit

@felthat - i donno much about XOrg or VESA but when I checked the Xorg.0.log there are some lines about VESA. How can I confirm that it is using the VESA fallback driver ? If it is, then how do i get the laptop to run on intel driver ?

fedhat gravatar imagefedhat ( 2018-08-20 13:12:31 -0500 )edit

answered 2018-08-21 11:05:01 -0500

fedhat gravatar image

Not the answer, but I posted a new question asking how to get Intel drivers loaded if the hardware is new, following @felthat 's suggestion that VESA fallback drivers could be running, and not intel as it shud be.

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Asked: 2018-05-19 19:57:43 -0500

Seen: 280 times

Last updated: May 21 '18