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#1 2009-06-12 01:40:08

Renan Birck
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From: Brazil
Registered: 2007-11-11
Posts: 401
Website

SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

Hello,

I upgraded to kernel26 2.6.30 from testing today, and now my laptop screen is with the brightness stuck on the 100% setting (which is too much for me, in fact it gives me a headache). The Fn-Arrow keys (which control the brightness) are unresponsive.

EDIT: Solved by placing options video brightness_switch_enabled=1 on /etc/modprobe.d/video.conf (create it if it doesn't exist).

I use Intel i965 video chipset on a laptop Acer Aspire 7720.

Solutions?

Thanks.

Last edited by Renan Birck (2009-06-12 01:56:20)

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#2 2009-06-19 20:55:50

Mrkva
Member
Registered: 2009-06-19
Posts: 3

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

Same problem here - but I've already tried your solution - haven't you changed anything else?
Edit: I belive you must have changed something else, because brightness_switch_enabled is on by default.

Last edited by Mrkva (2009-06-19 21:37:51)

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#3 2009-06-21 04:41:21

Relain
Member
Registered: 2009-03-10
Posts: 2

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

same here, added that line to my modprobe.d/video.conf and nothing changed.

Running a T400 with internal graphics (4500?) on the intel driver

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#4 2009-06-21 08:17:48

makimaki
Member
From: Ireland
Registered: 2009-04-02
Posts: 109

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

I have the same problem too, the only way I can change the brightness is via

setpci -s 00:02.1 F4.B=FF

I generally don't set it lower than 55, that's already quite dim, but to warn you I have a Samsung NC10, and the address for my video controller is 00:02.1
You need to run something like

lspci | grep VGA

to find out where yours is.

Edited to change from lshal to lspci

Last edited by makimaki (2009-06-21 20:53:14)


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#5 2009-06-21 09:59:54

Mrkva
Member
Registered: 2009-06-19
Posts: 3

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

Actually, I can change it via /sys/class/backlight/acpi_video0/brightness. But keys or xbacklight doesn't work.

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#6 2009-06-21 16:41:26

skottish
Forum Fellow
From: Here
Registered: 2006-06-16
Posts: 7,942

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

makimaki wrote:

I have the same problem too, the only way I can change the brightness is via

setpci -s 00:02.1 F4.B=FF

I generally don't set it lower than 55, that's already quite dim, but to warn you I have a Samsung NC10, and the address for my video controller is 00:02.1
You need to run something like

lshal | grep VGA

to find out where yours is.

lshal doesn't work for this on my system. lscpi does though:

lspci | grep VGA

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#7 2009-06-21 20:52:03

makimaki
Member
From: Ireland
Registered: 2009-04-02
Posts: 109

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

Sorry, was half asleep your right, it should be lspci.

My bad, tongue edited previous post.


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#8 2009-06-22 00:07:49

ryat
Member
Registered: 2009-06-22
Posts: 1

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

plz add kernel parameter:

acpi_backlight=vendor

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#9 2009-06-22 00:42:53

Mrkva
Member
Registered: 2009-06-19
Posts: 3

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

Wont work, sorry - but this is maybe because there is no vendor-specific acpi driver for my laptop (Lenovo 3000 N200). I've even tried vanilla -git17 kernel. Anyone have better idea than trying which commit broke it?

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#10 2009-06-22 22:27:16

Relain
Member
Registered: 2009-03-10
Posts: 2

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

the kernel option works on the thinkpad, thanks!

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#11 2009-06-23 21:42:55

Lars Stokholm
Member
From: Denmark
Registered: 2009-03-17
Posts: 223

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

ryat wrote:

plz add kernel parameter:

acpi_backlight=vendor

Now 2.6.30 hit core, so the problem got to me. (Well, I can adjust the brightness on the keyboard, but it's always on max when I reboot.)

I found out from Google what acpi_backlight=vendor does, but I didn't manage to figure out what has changed in 2.6.30 that makes me need it...?

Edit: Hmm, setting it to vendor actually makes my brightness keys stop working, but with the brightness on the right level. Removing the parameter completely, the brightness is maxed at reboot, as I said, but at least my keys are working. I guess I'll just set the brightness in rc.local for now.

Last edited by Lars Stokholm (2009-06-23 22:07:17)

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#12 2009-06-24 10:46:50

Ramses de Norre
Member
From: Leuven - Belgium
Registered: 2007-03-27
Posts: 1,289

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

ryat wrote:

plz add kernel parameter:

acpi_backlight=vendor

This worked on my dell vostro 1510 with intel graphics. Thanks a lot smile

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#13 2009-06-24 23:30:26

john_schaf
Member
From: France
Registered: 2007-02-24
Posts: 103

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

None of the solution works for me (setpci is no real solution, at least a workaroud...). Is it really solve for everyone ? (samsung nc10 here)

Last edited by john_schaf (2009-06-24 23:34:04)

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#14 2009-06-25 00:02:24

makimaki
Member
From: Ireland
Registered: 2009-04-02
Posts: 109

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

john_schaf wrote:

None of the solution works for me (setpci is no real solution, at least a workaroud...). Is it really solve for everyone ? (samsung nc10 here)

I've an NC10 too, I think the problems began when I installed a bios version hidden in their polish site that wasn't publicly available, and subsequently removed. It allowed me to increase the max amount of memory allocated to the graphics card from the bios.

Did you do the same, or is your problem just a symptom of the kernel and driver upgrades? I did switch on KMS around the same time, so it could be that either, but I like how my v/c looks with KMS, so I won't be turning it off tongue


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#15 2009-06-25 09:11:56

john_schaf
Member
From: France
Registered: 2007-02-24
Posts: 103

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

makimaki wrote:

I did switch on KMS around the same time, so it could be that either, but I like how my v/c looks with KMS, so I won't be turning it off tongue

It is indeed related with KMS ...

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#16 2009-06-25 11:26:45

madalu
Member
Registered: 2009-05-05
Posts: 217

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

I had the same problem on my Macbook Santa Rosa (4,1). I solved the problem by turning off KMS -- as outlined for a different distro on this web page:

http://www.cenolan.com/2009/06/installi … a-macbook/

When I disable KMS, the brightness keys and auto brightness levels work just fine.

I would be curious to know whether there's a fully functional fix for this.

Last edited by madalu (2009-06-25 11:27:08)

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#17 2009-07-02 04:33:24

TheSaint
Member
From: my computer
Registered: 2007-08-19
Posts: 1,481

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

I followed this thread and looking others too.
Nothing can work for my Aspire 6935, unfotunately.
Fn+F5 brings brightness to maximum, but no solution to dim it a little.
This is my vga card:

 lspci |grep -i vga
01:00.0 VGA compatible controller: nVidia Corporation GeForce 9600M GT (rev a1

Strangely the BIOS can control the brightness as expected, but Arch might not look into that.

F


do it good first, it will be faster than do it twice the saint wink

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#18 2009-07-02 09:38:43

makimaki
Member
From: Ireland
Registered: 2009-04-02
Posts: 109

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

TheSaint wrote:

I followed this thread and looking others too.
Nothing can work for my Aspire 6935, unfotunately.
Fn+F5 brings brightness to maximum, but no solution to dim it a little.
This is my vga card:

 lspci |grep -i vga
01:00.0 VGA compatible controller: nVidia Corporation GeForce 9600M GT (rev a1

Strangely the BIOS can control the brightness as expected, but Arch might not look into that.

F

I posted a bash script workaround here:
http://bbs.archlinux.org/viewtopic.php?id=74914

It uses the setpci command, and dc (part of bc package) to do hex conversion.

But to warn you I've only tried it on my intel 945GM, I don't know if it will work with an nvidia card.


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#19 2009-07-02 13:19:22

TheSaint
Member
From: my computer
Registered: 2007-08-19
Posts: 1,481

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

Thank you for your efforts. I already tried setpci, but didn't give any result.
I've tried also nvclock's smartdimmer, but it gives segfault. Even nvidia-bl didn't fit for the case, even it said to be compatible with G 9600M card.
All other solution from this and other threads weren't successful.

F


do it good first, it will be faster than do it twice the saint wink

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#20 2009-07-09 20:51:38

Nepherte
Member
From: Singapore
Registered: 2008-09-09
Posts: 427
Website

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

I would like to mention that adding the kernel parameter acpi_backlight=vendor re-enables the brightness keys on a Sony Vaio SZ61XN/C.

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#21 2009-08-29 17:17:42

mukul_s
Member
From: India
Registered: 2009-08-14
Posts: 34

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

Nepherte wrote:

I would like to mention that adding the kernel parameter acpi_backlight=vendor re-enables the brightness keys on a Sony Vaio SZ61XN/C.

Hi,
On my Sony VAIO hotkeys (including brightness) are not working. Where to add this kernel parameter??


Regards
Mukul

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#22 2009-08-29 17:30:14

Lars Stokholm
Member
From: Denmark
Registered: 2009-03-17
Posts: 223

Re: SOLVED: kernel26 2.6.30 -> laptop LCD brightness stuck on max

mukul_s wrote:

On my Sony VAIO hotkeys (including brightness) are not working. Where to add this kernel parameter??

In /boot/grub/menu.lst. On the 'kernel' line.

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