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Old 11-03-07, 09:48 AM   #13
NvFuchs
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Default Re: Brightness control not working with nVidia driver

I'd just like some kind of feedback from the nv developers,
feedback as in "yes, we are aware of this bug and try to fix it", "yes, we know this bug exists but it is not fixable" or just "we don't care about this bug".

Would be nice...

Fuchs
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Old 11-03-07, 02:48 PM   #14
zander
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Default Re: Brightness control not working with nVidia driver

We're aware of this problem. It is being investigated, but at this point, I can't say if or when it can be addressed.
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Old 11-03-07, 06:47 PM   #15
NvFuchs
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Default Re: Brightness control not working with nVidia driver

Thanks a lot for the feedback Zander.

Just let me know when I can provide you further information. (As in: you don't have the hardware to test it)

I hope you will be able to fix it soon,
thanks for the good work anyway until then.

(Still happy with nvidia in 3 notebooks and 1 desktop)
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Old 11-03-07, 09:23 PM   #16
macemoneta
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Default Re: Brightness control not working with nVidia driver

I just wanted to mention that this is a problem with the current (9643) legacy driver as well.
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Old 11-04-07, 08:01 AM   #17
NvFuchs
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Default Re: Brightness control not working with nVidia driver

Just as a note to people having this problem:

You can at least set the brightnes with
nvidia-settings, and as the fn+end/home
combinations generate key events you can
set a command to this keys.

I wrote this script:

Code:
#!/bin/bash
brightnes=`head -n 1 /proc/acpi/ibm/brightness | awk '{print $2}'`
case "$brightnes" in
    7)
    bright=0;
    ;;
    6)
    bright=-0.1;
    ;;
    5)
    bright=-0.2;
    ;;
    4)
    bright=-0.3;
    ;;
    3)
    bright=-0.4;
    ;;
    2)
    bright=-0.5;
    ;;
    1)
    bright=-0.6;
    ;;
    1)
    bright=-0.7;
    ;;
    0)
    bright=-0.8;
    ;;
    *)
    ;;
esac
nvidia-settings -a brightness=$bright
exit 0
and xmodmap to bind the keycodes generated
to a key (F14,F15...).

I haven't tested yet wheter battery lifetime
increases with this, as the brightness is
set via software, not the hardware backlight
of the LCD screen. But at least you have some
brightnes adjusting functionality.

Sidenotes:
The script might as well work with /bin/sh
(so it is not bash/linux dependant)
but I haven't tested so far whether sh
provides the case statement.

I don't provide the display as an argument
to nvidia-settings either, so you might want
to add this depending on your setup.

There is still a "bug" in it: the ibm driver
goes twice through all brightness levels,
0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7.
So the display will go to 0 brightnes after full brightnes
and vice versa.


For those who are not familiar with Xmodmap or keycodes:

Use the application xev to print the keycode the fn combination
provides, so just run xev then hit FN+End or FN+Home.
Write down the keycode. Then add these two lines to a file,
let's call it .xmodmap as an example, in any directory:

keycode 101 = F28
keycode 212 = F29

with the keycodes you got from xev. On a R61 they are 101 and 212.
Make sure that the command xmodmap ~/.xmodmap runs
on login, so use the autostart of your DE/WM or the .xinitrc file.

Afterwards you can use the F28 and F29 keys to set them as shortcuts
for your windowmanager / desktop environment.


hth, Fuchs
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Old 11-04-07, 08:13 AM   #18
tier
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Default Re: Brightness control not working with nVidia driver

This doesn't change the backlight brightness but the color-brightness.. that's something very different and it doesn't save any power.
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Old 11-04-07, 08:13 AM   #19
macemoneta
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Default Re: Brightness control not working with nVidia driver

If that works for you, I think you have a different problem.

First, the nvidia-setting brightness doesn't change the backlight intensity; it changes the image brightness (washing it out).

Second, at least in my case (/proc/acpi/toshiba/lcd), the /proc acpi interface to the video is not operational. The same problem exists with the new video interface (/sys/class/backlight/toshiba/brightness). It accepts a value, but does not change the backlight intensity.
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Old 11-04-07, 09:01 AM   #20
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Default Re: Brightness control not working with nVidia driver

I'm sorry for trolling, but this seems to be blatant incompetence on nVidia's side. This bug has been known and reported for at least a year - and it's still not been fixed.



I was pointed to nvclock in an earlier post, but that's really just a joke, isn't it? It works fine, yes, but I need to manually build an SVN version - and mind you, I still can't use the FN-Keys to adjust my brightness, nor will it do so automatically when I plug out the cord. And theres's another issue with nvclock: when I resume from suspend to memory, it ceases to work. Great. So my only option for adjusting my Laptop's backlight intensity is: switch to a virtual console, adjust, switch back - given my Laptop's uptime of more than seven days and ~20-40 suspend/resume cycles during that period of time.



It can't be that hard to fix nVidia! Even if your architecture is so special that you would have to work around it to re-enable an already present hardware functionality that works without the drivers, and would thus be broken by design, you should really be capable of doing this!



What's that? Customer support? I won't buy an nVidia-Laptop next time. Nor will I recommend it to anybody. ATI have released part of their specs and Intel are producing quality open source drivers. Their cards may not be as good, but if I wanted to play high end games, I would not be using Linux in the first place. If nVidia wants to keep their costumer base they shouldn't be treating them so badly
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Old 11-09-07, 12:01 PM   #21
fortegas
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Default Re: Brightness control not working with nVidia driver

Please a solution for this,

I have a sony vaio FZ-21S and have the same problem i have contact with nvidia developer team to get support and it was the answer:

(07 November 2007)
Are you able to change the brightness using the hotkeys on your
notebook? If not, this is likely a known issue that is already being
investigated by our team.

I hope a solution as soon as possible because can't work with ubuntu because this issue (too much bright) but because the post before i think they think it is not so important, what can we do to told him it is very important for us?
- i can't work with the laptop with not too much lights on.
- My battery in windows can be used during 2 hours and half, in linux only 1 hour or less.
- The fn keys for the brightness does not work.

NVidia should think that this is not a simple problem with the computer embedded camera, it is more serious problem.
All new FZ vaios and other brands has the same problem, and much people can't work in linux because of this.
One of the reasons to buy this laptop was the graphics card, but it seems that i was wrong.

Can any NVidia Person told us when this is going to be solve? estimations?
__________________
Sony Vaio FZ21S
NVidia 8600GS (without brightness control in Ubuntu)
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Old 11-14-07, 09:12 AM   #22
longshot-nm
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Default Re: Brightness control not working with nVidia driver

Since this is a known problem, would Nvidia provide the register information for chips such as the 6150 so that the developer of nvclock can add these chips to his program and allow us to have something that will allow us to change the brightness of the display?

I'm sure that there are other chips that are not supported for brightness control through the Nvidia driver that could be added to nvclock if the register information could be provided.
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Old 11-14-07, 09:39 AM   #23
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Default Re: Brightness control not working with nVidia driver

I have some additional information that might be useful... I have two identical laptops (same vendor and model, same video card, memory etc.). The brightness control works on one but not the other. The only difference between them is that one (where brightness control doesn't work) is running dual head.

I don't know if this is a known case or not, but I thought it might be useful for tracking down the cause if not. The two nvidia bug reports are attached.
Attached Files
File Type: zip nvidia-bug-report.log.zip (27.3 KB, 238 views)
File Type: zip nvidia-bug-report-dual.log.zip (28.2 KB, 237 views)
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Old 11-15-07, 11:04 AM   #24
zander
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Default Re: Brightness control not working with nVidia driver

We identified one problem interfering with SBIOS assisted brightness control on GeForce 8 series mobile systems. This problem will be fixed in a future NVIDIA Linux graphics driver release. Unfortunately, I can not provide an estimate for when this graphics driver will become available.
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