Where are the configuration files for loading kernel modules? Which module(s) is/are responsible for controlling the backlight on my Toshiba A665 laptop? When I ran Fedora 14 I had some knowledge of this but with 16 I'm ignorant where to even start. My problem is I updated to kernel 3.3.0-4.fc16.x86_64 and now I can't get the backlight to go up or down. Now, I have another thread posted on this issue but I have no replies so I'm going to try and tackle it myself. I suspect it has to do with the order in which the required modules are loaded. The backlight GUI comes up but has no effect on brightness. I've searched and can't find anything anywhere. If I go back to the original kernel it works fine. See my other posts with attached files showing modules loaded with each kernel. In the past with previous versions of Fedora I have changed the order of loaded modules to repair device related problems. Thanks in advance.

Not meaning purely to bump this thread but simply editing does not permit attachments and a moderator closed the previous thread I mentioned relating to this issue. So here are the attachments showing modules loaded with each kernel. Bear in mind the backlight brightens and dims properly with the old kernel, not so with the new kernel.
modules_loaded_3.1.0-7.fc16.x86_64.txt

modules_loaded_3.3.0-4.fc16.x86_64.txt

Hi

I'm not sure if this might be pointing you in the wrong direction,
but I found a number of references to Ubuntu users disabling ACPI
and restoring some of the backlight functionality of the Toshiba
Satellite A665 (with very mixed results) at:

http://ubuntuforums.org/showthread.php?t=1533744&page=2

Would Linux - ACPI incompatibilities, perhaps be another angle
you could use to investigate this problem further ?

C.

Might be worth a thought:

http://ubuntuforums.org/showthread.php?t=1473728
reference to Ubuntu using
(boot time) acpi_backlight=vendor
I wonder what other settings it option has ?

C.

Someone has reported a fix for Fedora 15
https://bugzilla.redhat.com/show_bug.cgi?id=753012

acpi_backlight=vendor acpi_osi=Linux kernel options in grub.conf

There are a number of suggested solutions, and work arounds
for a variety of models. Some reports of it working and not working
for F16 on different machines.

Hmmm....
I suggest that you have a look

C.

Thank you, cgtueno for your replys and the links you provided. I'll do some reading on those.

Okay I tried all that with the exception of installing the proprietary Nvidia drivers and no joy. Reinstalled bash, used the kernel options too. Nothing works. So I'm back on the original kernel again for now. Thanks anyway.