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How to get backlight working on e525?

asked 2011-11-14 12:54:22 +0000

updated 2013-06-04 02:52:42 +0000

Postscript: I did not realise it when I posted, but this problem is about the laptop's backlight being permanently off. The screen goes black while the kernel is loading and stays off preventing users seeing even the login screen. It started with Fedora 15 and has persisted. Installing in basic graphics mode was needed because the screen went black with full graphics.

Postscript2: kernel-3.8.6-203.fc18.x86_64 fixed this bug. Fedora works out of the box again, although the brightness controls still do not work.

Original question: I have an eMachines e525 laptop. F14 ran properly out of the box with the screen at 1366×768. With F16 I had to install in basic graphics mode and now the screen resolution is fixed at 1024x768, everything looks squat, and Gnome3 only runs in fallback mode.

The e525 has the Intel Mobile 4 Series Chipset Integrated Graphics Controller (GM45).

Has anyone solved this problem yet?

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answered 2013-04-08 16:37:27 +0000

updated 2013-04-09 11:44:22 +0000

The squat appearance was caused by the vesa driver being used because I had to install in basic graphics mode. Removing the xorg.conf created by Anaconda caused the intel driver to be used but the screen went black during kernel loading and stayed black.

Adding i915.invert_brightness=1 to GRUB_CMDLINE_LINUX in /etc/default/grub eg:

GRUB_CMDLINE_LINUX="i915.invert_brightness=1"

and running:

grub2-mkconfig -o /boot/grub2/grub.cfg

Solved the problem.

BTW: During the lifetime of this problem Intel's Open Source Technology Centre made some drivers available. I installed them but they did not help and I removed them.

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answered 2012-06-18 18:00:42 +0000

ejhuff gravatar image

Regarding response by hhlp:

$ yum info libtxc_dxtn
Available Packages
Name        : libtxc_dxtn
Arch        : i686
Epoch       : 1
Version     : 1.0.0
Release     : 1.fc15
Size        : 13 k
Repo        : rpmfusion-free
Summary     : Free implementation of the s3tc texture compression algorithm
URL         : http://cgit.freedesktop.org/~mareko/libtxc_dxtn/
License     : BSD
Description : Free implementation of the s3tc texture compression algorithm

$ yum info mesa-dri-drivers Loaded plugins: auto-update-debuginfo, refresh-packagekit Installed Packages Name : mesa-dri-drivers Arch : i686 Version : 7.11.2 Release : 3.fc16 Size : 34 M Repo : installed From repo : updates Summary : Mesa-based DRI drivers URL : http://www.mesa3d.org License : MIT Description : Mesa-based DRI drivers.

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Yes, libtxc_dxtn is not maintained: see http://people.freedesktop.org/~cbrill/libtxc_dxtn/. It provides software compression/decompression of s3tc textures.

"Depending on where you live, you might need a valid license for s3tc in order to be legally allowed to use the external library"

ejhuff ( 2012-06-18 18:33:17 +0000 )edit
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answered 2011-11-30 19:21:33 +0000

hhlp gravatar image

updated 2013-04-08 07:36:32 +0000

Bucic gravatar image

have you tried the latest Intel drivers from RPM Fusion?

1.- Activate RPMFusion:

su -c 'yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm'

2.- update :

sudo yum -y update

3.- Install...

sudo yum -y install mesa-dri-drivers
su -c 'yum install libtxc_dxtn --enablerepo=rpmfusion-free-updates-testing'

4.- Update again:

sudo yum -y update

Reboot....

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I don't understand. AFAIK there are no INTEL proprietary drivers. I already have mesa-dri-drivers installed from the updates repo. Also libtxc_dxtn appears to be concerned with only textures and is no longer supported.

Peter Scott ( 2012-02-27 16:56:40 +0000 )edit

@Peter Scott Good point. There is no "intel proprietary drivers". A bit of misunderstanding. I've edited the hhlp's post.

Bucic ( 2013-04-08 19:05:25 +0000 )edit

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Asked: 2011-11-14 12:54:22 +0000

Seen: 4,229 times

Last updated: Jun 04 '13