Medion E6214 (MD98330) not able to change the brightness of the screen

Good evening,

i have a problem with my Medion Laptop. I can’t change the brightness of the screen. I have installed openSUSE 12.1 with KDE on it. I also can’t change the brightness with the FN-Keys ore with the slider on the battery Application. I tested the reaction of the keys with the terminal tool xev and it answers me with, brightness up and brightness down.
Has anybody a solution to solve this problem? If there are some more information needed, please post it!

Florian

I hope you can understand my bad english :slight_smile:

On 02/08/2012 10:46 PM, florian098 wrote:
>
> I hope you can understand my bad english :slight_smile:

your english is great…you can try, but i can’t promise it will help:

next time you boot, at the first green screen just start typing


acpi_backlight=vendor

exactly as i have (that is, do not replace ‘vendor’ with ‘medion’) and
that will automatically show up in the “Boot Options” line…when
finished typing just press enter and make a wish…

if it does not work come back and say so, and maybe are other ideas to try…

if it does work come back and tell us (so if another googles in they can
see your success) AND, if you ask someone can tell you how to make that
happen every time, without you having to type it everytime…


DD http://tinyurl.com/DD-Caveat
Read what Distro Watch writes: http://tinyurl.com/SUSEonDW

Thanks it works! If you have some time, can you explain me, what does this thing change on my system?

Florian

I do not know if I understood what you want.

A)
If you want to change this permanently/make this change permanent (instead of typing each time your system stats):

YaST -> System: Boot Loader -> Tab: Section Management: choose the (openSUSE) system/boot option that starts if you do nothing (the one with the check mark) or generally the one that you want to change,
click on the [Edit] button below
[if you want to test again, you can also use the bottom [Add] and ‘clone’ the selected booting option],
add

 acpi_backlight=vendor

(I have also added a ‘space’ in front) to the line “Optional Kernel Command Line Parameter”, click on [OK] to save

B)
If you want to know how and why this “Kernel Command Line Parameter” acpi_backlight=vendor works- post again (probably someone else knows more about this than me…)

Good luck!
Martin

Yes, this is what I wanted in my last post. Sorry for this bad expression :slight_smile:

Florian

No cause to feel sorry, florian. Probably it was my fault.

Kernel Parameters
on
http://www.kernel.org/doc/Documentation/kernel-parameters.txt
says:

…]
acpi_backlight= [HW,ACPI]
acpi_backlight=vendor
acpi_backlight=video
If set to vendor, prefer vendor specific driver
(e.g. thinkpad_acpi, sony_acpi, etc.) instead
of the ACPI video.ko driver.
…]

Maybe some linux kernel developer could tell you how this works inside the kernel

  • where the vendor specific driver are
  • how the kernel knows about [hopefully] the right vendor
    or if “vendor specific driver” are here just not the standard acpi specifications but something made form Microsoft???
    and so on?

Regards
Martin