[gentoo-user] power management cannot change LCD brightness

[gentoo-user] power management cannot change LCD brightness

[Xi Shen]

hi,

my system is gentoo amd64, kde 4.3. my laptop is thinkpad t61. after
some configure in the kernel, and reboot with the new kernel, i can
use the Fn+Home, and Fn+End to change the brightness of my lcd. but
when i tried to change the lcd brightness by dragging the handle on
the 'power management' tool, nothing happens. what else should i
configure?


-- 
Best Regards,
David Shen

http://twitter.com/davidshen84/

Re: [gentoo-user] power management cannot change LCD brightness

[Frank Steinmetzger]

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Am Sonntag 28 Februar 2010 schrieb Xi Shen:
> hi,
> 
> my system is gentoo amd64, kde 4.3. my laptop is thinkpad t61. after
> some configure in the kernel, and reboot with the new kernel, i can
> use the Fn+Home, and Fn+End to change the brightness of my lcd. but
> when i tried to change the lcd brightness by dragging the handle on
> the 'power management' tool, nothing happens. what else should i
> configure?

It has never worked here, though I’m satisfied that I can use Fn+Crsr up/down, 
which works on the HW level (even at boot).
-- 
Gruß | Greetings | Qapla'

Never argue with an idiot.
He brings you down to his level, then beats you with experience.

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Re: [gentoo-user] power management cannot change LCD brightness

[roundyz]

Frank Steinmetzger wrote:

>> Am Sonntag 28 Februar 2010 schrieb Xi Shen:
>> > hi,
>> > 
>> > my system is gentoo amd64, kde 4.3. my laptop is thinkpad t61. after
>> > some configure in the kernel, and reboot with the new kernel, i can
>> > use the Fn+Home, and Fn+End to change the brightness of my lcd. but
>> > when i tried to change the lcd brightness by dragging the handle on
>> > the 'power management' tool, nothing happens. what else should i
>> > configure?
>> 
>> It has never worked here, though I???m satisfied that I can use Fn+Crsr up/down, 
>> which works on the HW level (even at boot).
>> -- 
>> Gru?? | Greetings | Qapla'
>> 
>> Never argue with an idiot.
>> He brings you down to his level, then beats you with experience.

Hi,
fisrt see if proc and your kernel has it right, do:
 cat  /proc/acpi/video/GFX0/DD02/brightness 

should give something like 

levels:  13 25 38 50 63 75 88 100
current: 13

if that works, check permissions on the file and try to echo a level
number to it..

echo 13 > /proc/acpi/video/GFX0/DD02/brightness 

it it changes then its down to the app, check the use flags of the app,
and see whats missing.

good luck


-- 
Regards,
Roundyz

Re: [gentoo-user] power management cannot change LCD brightness

[Xi Shen]

On Sun, Feb 28, 2010 at 9:32 PM,  <roundyz@hotmail.ru> wrote:
> Hi,
> fisrt see if proc and your kernel has it right, do:
>  cat  /proc/acpi/video/GFX0/DD02/brightness

i found a similar file at /proc/acpi/video/VID1/LCD0/brightness. i
think they are the same :)

>
> should give something like
>
> levels:  13 25 38 50 63 75 88 100
> current: 13
>
> if that works, check permissions on the file and try to echo a level
> number to it..
>
> echo 13 > /proc/acpi/video/GFX0/DD02/brightness
>
> it it changes then its down to the app, check the use flags of the app,
> and see whats missing.
>

what use flag should i check? i have acpi already, and just have apm,
pmu, nvidia, lm_sensors added. i guess this should be everything.

> good luck
>
>
> --
> Regards,
> Roundyz
>
>



-- 
Best Regards,
David Shen

http://twitter.com/davidshen84/

Re: [gentoo-user] power management cannot change LCD brightness

[Xi Shen]

On Tue, Mar 2, 2010 at 5:58 PM, Xi Shen <davidshen84@googlemail.com> wrote:
> On Sun, Feb 28, 2010 at 9:32 PM,  <roundyz@hotmail.ru> wrote:
>> Hi,
>> fisrt see if proc and your kernel has it right, do:
>>  cat  /proc/acpi/video/GFX0/DD02/brightness
>
echo "20"> /proc/acpi/video/VID1/LCD0/brightness can change the
brightness of my lcd. but dragging the power management tool still
cannot work.


-- 
Best Regards,
David Shen

http://twitter.com/davidshen84/

Re: [gentoo-user] power management cannot change LCD brightness

[roundyz]

Xi Shen wrote:

>> 
>> On Tue, Mar 2, 2010 at 5:58 PM, Xi Shen <davidshen84@googlemail.com> wrote:
>> > On Sun, Feb 28, 2010 at 9:32 PM, ??<roundyz@hotmail.ru> wrote:
>> >> Hi,
>> >> fisrt see if proc and your kernel has it right, do:
>> >> ??cat ??/proc/acpi/video/GFX0/DD02/brightness
>> >
>> echo "20"> /proc/acpi/video/VID1/LCD0/brightness can change the
>> brightness of my lcd. but dragging the power management tool still
>> cannot work.
>> 

Hi,

Whats the name of the tool and what use flags are set?
It's most likely that you are going to need to re-emerge it, or some
component that it depends upon if it is part of gnome or kde, etc.

I use a little script with wmbutton along with some menu entries on
blackboxwm.  Works nice.

-- 
Regards,
Roundyz

Re: [gentoo-user] power management cannot change LCD brightness

[Xi Shen]

On Fri, Mar 5, 2010 at 4:33 PM,  <roundyz@hotmail.ru> wrote:
>
> Hi,
>
> Whats the name of the tool and what use flags are set?
> It's most likely that you are going to need to re-emerge it, or some
> component that it depends upon if it is part of gnome or kde, etc.
>

i have acpi, hal, apm, pmu, nvidia, lm_sensors, etc. putted in the
make.conf. i think those use flags will apply to all apps. but i
really do not know which one to re-emerge.

> I use a little script with wmbutton along with some menu entries on
> blackboxwm.  Works nice.
>

i am using kde, BTW


-- 
Best Regards,
David Shen

http://twitter.com/davidshen84/

Re: [gentoo-user] power management cannot change LCD brightness

[Damian]

On Sun, Feb 28, 2010 at 2:15 PM, Frank Steinmetzger <Warp_7@gmx.de> wrote:
> Am Sonntag 28 Februar 2010 schrieb Xi Shen:
>> hi,
>>
>> my system is gentoo amd64, kde 4.3. my laptop is thinkpad t61. after
>> some configure in the kernel, and reboot with the new kernel, i can
>> use the Fn+Home, and Fn+End to change the brightness of my lcd. but
>> when i tried to change the lcd brightness by dragging the handle on
>> the 'power management' tool, nothing happens. what else should i
>> configure?
>
> It has never worked here, though I’m satisfied that I can use Fn+Crsr up/down,
> which works on the HW level (even at boot).
I don't know if you have an nvidia card. I had the same problem: I was
only able to change the brightness from a text console. I solved the
problem by installing nvclock (now I no longer need sunglases).

I hope that helps.

Re: [gentoo-user] power management cannot change LCD brightness

[Xi Shen]

On Wed, Mar 10, 2010 at 4:32 PM, Damian <damian.only@gmail.com> wrote:

> I don't know if you have an nvidia card. I had the same problem: I was
> only able to change the brightness from a text console. I solved the
> problem by installing nvclock (now I no longer need sunglases).
>
> I hope that helps.
>
>

thanks, i solved this problem without emerging the nvclock package. i
guess it is a group and permission issue. i have my accounts joined
these groups: disk wheel audio cdrom video usb users plugdev, and i
can change the lcd brightness with the kde widget.


-- 
Best Regards,
David Shen

http://twitter.com/davidshen84/

Re: [gentoo-user] power management cannot change LCD brightness

[Xi Shen]

On Wed, Mar 10, 2010 at 8:10 PM, Xi Shen <davidshen84@googlemail.com> wrote:
> thanks, i solved this problem without emerging the nvclock package. i
> guess it is a group and permission issue. i have my accounts joined
> these groups: disk wheel audio cdrom video usb users plugdev, and i
> can change the lcd brightness with the kde widget.
>
>

i further identified the cause, and it is the 'plugdev' group. if the
user (include root) is not a member of this group, you will not be
able to use the kde widget to change the brightness of the lcd. an
even wired issue i found is that, after you joined in the group, you
will have to restart the system. log off and log on takes no effect.


-- 
Best Regards,
David Shen

http://twitter.com/davidshen84/