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-   -   laptop Digest, Vol 55, Issue 10: brightness problems in FC14 on Lenovo T510 (http://www.linux-archive.org/fedora-laptop/459103-laptop-digest-vol-55-issue-10-brightness-problems-fc14-lenovo-t510.html)

Sebastian Rust 11-29-2010 07:14 PM

laptop Digest, Vol 55, Issue 10: brightness problems in FC14 on Lenovo T510
 
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On 29.11.2010 16:54, Eran Arad wrote:

> Hi

>

> The brightness button are working properly in Windows 7.

> The problem arises while using under FC14. Indeed it
appears that

> the brightness

> buttons are not scaled correctly. I tried to set the power

> management so that there won't

> be lower brightness when working on battery but it had no
effect.

> Following this a message I received a suggestion from
Vinzenz

> Vietzke to add

> a line

> Option "RegistryDwords" "EnableBrightnessControl=1"

> to file /etc/X11/xorg.conf.

> However, while there is such a file in RedHat Enterprise
distribution,

> the FC distribution does not have such a file. None in FC12

> in FC14 there is a /etc/X11/xorg.conf.d directory where the
keybord

> conf file

> resides.

>

> So, the problem still exists

>

> Thanks for your support,

> Eran

> On Mon, Nov 29, 2010 at 2:00 PM,

> <laptop-request@lists.fedoraproject.org

> <mailto:laptop-request@lists.fedoraproject.org>>
wrote:

>

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> Today's Topics:

>

> 1. Problem with Fedora 14 on a Laptop (Eran Arad)

> 2. Re: Problem with Fedora 14 on a Laptop (Harlequin)

>

>

>
----------------------------------------------------------------------

>

> Message: 1

> Date: Sun, 28 Nov 2010 20:44:39 +0200

> From: Eran Arad <eran.arad@gmail.com
<mailto:eran.arad@gmail.com>>

> Subject: Problem with Fedora 14 on a Laptop

> To: laptop@lists.fedoraproject.org

> <mailto:laptop@lists.fedoraproject.org>

> Message-ID:

>

>
<AANLkTi=AkQGO46km9D4PzY4g7UyW+h5vpsitgk7exyAm@mai l.gmail.com

>
<mailto:AkQGO46km9D4PzY4g7UyW%2Bh5vpsitgk7exyAm@ma il.gmail.com>>

> Content-Type: text/plain; charset="iso-8859-1"

>

> Hello

>

> I wonder if someone encountered this problem:

> I have just received a brand new Lenovo T510 Laptop. I have

> installed,

> successfully, a Fedora 14 system. This is a dual-system
machine,

> with Window

> 7 Professional also installed.

>

> The problem: Staring the machine in Fedora, unplugged to

> electricity, the

> screens dims down to hardly readable level. Trying to
increase

> brightness,

> using the function+brightness button has no effect.
Plugging to

> electricity

> restores proper brightness.

> Another show up of the same problem: started plugged in
with proper

> brightness, than any touch of function+brightness key
brings the

> screen to

> unreadable, and unchangeable brightness. Seem to me that
the

> eFedora 14

> scales the potentiometer of screen luminosity incorrectly.

>

> Some information: Working in Windows 7, on the same
machine:

> this does not

> happen

> On previous Lenovo, T60p, with Fedora

> 12, this

> did not happen either.

>

> Has anybody encountered this problem ? any clue how to
resolve,

>

> Thanks,

> Eran

> -------------- next part --------------

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>

> ------------------------------

>

> Message: 2

> Date: Sun, 28 Nov 2010 20:23:29 +0100

> From: Harlequin <harlequix@googlemail.com

> <mailto:harlequix@googlemail.com>>

> Subject: Re: Problem with Fedora 14 on a Laptop

> To: laptop@lists.fedoraproject.org

> <mailto:laptop@lists.fedoraproject.org>

> Message-ID:

> <6bb59c6e-0455-4afe-8709-f34011514b5e@email.android.com

>
<mailto:6bb59c6e-0455-4afe-8709-f34011514b5e@email.android.com>>

> Content-Type: text/plain; charset=utf-8

>

> It seemd hat your brightness buttons are not working. Could
you

> please try to change brightness via the power manager. And
which

> de are you using?

>

>

>

> "Eran Arad" <eran.arad@gmail.com
<mailto:eran.arad@gmail.com>>

> schrieb:

>

> >Hello

> >

> >I wonder if someone encountered this problem:

> >I have just received a brand new Lenovo T510 Laptop. I
have

> installed,

> >successfully, a Fedora 14 system. This is a dual-system

> machine, with

> >Window

> >7 Professional also installed.

> >

> >The problem: Staring the machine in Fedora, unplugged
to

> electricity,

> >the

> >screens dims down to hardly readable level. Trying to
increase

> >brightness,

> >using the function+brightness button has no effect.
Plugging to

> >electricity

> >restores proper brightness.

> >Another show up of the same problem: started plugged in
with proper

> >brightness, than any touch of function+brightness key
brings

> the screen

> >to

> >unreadable, and unchangeable brightness. Seem to me
that the

> eFedora 14

> >scales the potentiometer of screen luminosity
incorrectly.

> >

> >Some information: Working in Windows 7, on the same
machine:

> this does

> >not

> >happen

> > On previous Lenovo, T60p, with Fedora

> 12, this

> >did not happen either.

> >

> >Has anybody encountered this problem ? any clue how to
resolve,

> >

> >Thanks,

> >Eran

> >_______________________________________________

> >laptop mailing list

> >laptop@lists.fedoraproject.org

> <mailto:laptop@lists.fedoraproject.org>

> >https://admin.fedoraproject.org/mailman/listinfo/laptop

>

> --

> This message has been sent from my android phone with k-9
mail

>

>

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>

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> End of laptop Digest, Vol 55, Issue 10

> **************************************

>

>

>

>

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Yes Xorg doesn't use xorg.conf anymore, it uses everything that is

located in xorg.conf.d.

So create a new file or attach this to your keyboard config (it

doesn't matter):



Section "Device"

Identifier "Device0"

Driver "nvidia"

VendorName "NVIDIA Corporation"

Option "RegistryDwords" "EnableBrightnessControl=1"

EndSection



This should fix your problems. Reboot and enjoy. But if you
experience

any trouble and you get thrown into terminal-mode, remove the
file.

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