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Old 10-27-09, 05:07 PM   #25
bistory
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Default Re: Can't change the brightness with nvidia driver

I think you should invite people who has the same problem to post here to make Nvidia react.
But they could even never react because they claim that it is an OEM-specific problem, so you must use external tools to change the backlight...

There is a bug opened on bugzilla on linux himself, it's a way to make the things move.

I want to notice that the Nouveau project has already implemented backlight managing in their drivers !
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Old 10-27-09, 06:28 PM   #26
Stendall
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Default Re: Can't change the brightness with nvidia driver

I don't have to use any external tool, simply compiling the kernel with various legacy support has worked for me.
I think Nvidia does not stands at day with new changes in kernel.
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Old 10-28-09, 02:20 AM   #27
LuHe
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Default Re: Can't change the brightness with nvidia driver

What legacy support do you mean exactly?
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Old 10-28-09, 04:23 AM   #28
Stendall
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Default Re: Can't change the brightness with nvidia driver

I don't know exactly the lack of what legacy support have to blame , because I switched to active a lot of legacy /proc /sys support at once, as a last try to fix the brightness problem.
Hold on ,I'l go to recompile. This time turning one at time and testing brightness support.
When I have the guilty, I tell you.
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Old 10-28-09, 04:50 AM   #29
LuHe
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Default Re: Can't change the brightness with nvidia driver

That would be great
What notebook model do you have? I hope it doesn't matter that I have a HP.
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Old 10-28-09, 05:16 AM   #30
Stendall
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Default Re: Can't change the brightness with nvidia driver

I tried switched on/of the ACPI legacy support for:
/proc files
/proc directories
/proc events
And recompiled the kernel every time.
Till the moment, the only that has worked for me, was unload the support for acpi video. After unload, the brightness support stop working for fn keys and power devil.
I will continue doing tests, can be involved something more.
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Old 10-28-09, 05:18 AM   #31
Stendall
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Default Re: Can't change the brightness with nvidia driver

Sorry didn't see your post
I have an HP Pavillion DV6880es, Nvidia 8400M GS (G86).
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Old 10-29-09, 04:09 AM   #32
bistory
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Default Re: Can't change the brightness with nvidia driver

Hum that would be great to investigate this way !
Keep the good work and let us know what are the options to enable !
Thanks !
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Old 10-29-09, 05:21 AM   #33
Stendall
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Default Re: Can't change the brightness with nvidia driver

About this topic, I've found that if you don't compile the legacy ACPI /proc event support, the brightness work. But when coming from switching from console or sleep, the brightness can be only changed by the fn keys, till the next reboot.
¿Please can you check if have you enabled and/or loaded the video acpi module?
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Old 10-29-09, 08:49 AM   #34
bistory
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Default Re: Can't change the brightness with nvidia driver

I've no video acpi module, and i'll test disable /proc/acpi/event
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Old 10-29-09, 05:51 PM   #35
Stendall
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Default Re: Can't change the brightness with nvidia driver

Copy and paste the line below in a console, and put the results here:
cat /boot/config-`uname -r` | grep CONFIG_ACPI_VIDEO
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Old 10-29-09, 05:59 PM   #36
LuHe
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Default Re: Can't change the brightness with nvidia driver

Are you using a vanilla kernel? Could you send me a kernel .config file please?

The video module is built as a module on my (fedora) kernel and it is loaded.
But nothing changed when I removed it (rmmod video)

modinfo says that it has the parameter brightness_switch_enabled:bool, will try to play with this...
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