Arch Linux

snoxu

Member

Registered: 2010-01-24

Posts: 141

Re: Can't control brightness with nvidia

no it can't be invalid option, you are doing something wrong for shure.

See for yourself then

Hint: Unknown option 'bios'

System still boots. No brightness control

Last edited by snoxu (2012-11-27 14:44:48)

brebs

Member

Registered: 2007-04-03

Posts: 3,742

Re: Can't control brightness with nvidia

From /usr/src/linux/Documentation/kernel-parameters.txt:

bios [X86-32]   force use of PCI BIOS, don't access the hardware directly. Use this if your machine has a non-standard PCI host bridge.

So I suppose it's a valid option for 32-bit only.

I'm surprised that no-one's mentioned EnableBrightnessControl in xorg.conf

snoxu

Member

Registered: 2010-01-24

Posts: 141

Re: Can't control brightness with nvidia

I'm surprised that no-one's mentioned EnableBrightnessControl in xorg.conf

Already tried that:
https://wiki.archlinux.org/index.php/Nv … on_laptops

brebs

Member

Registered: 2007-04-03

Posts: 3,742

Re: Can't control brightness with nvidia

With nvidia, I use:

echo 7 > /sys/class/backlight/acpi_video0/brightness

If you don't have /sys/class/backlight/acpi_video0/, then are you disabling ACPI? I suggest pastebinning your dmesg, so we can check it.

snoxu

Member

Registered: 2010-01-24

Posts: 141

Re: Can't control brightness with nvidia

deleted

Last edited by snoxu (2012-11-27 18:53:47)

snoxu

Member

Registered: 2010-01-24

Posts: 141

Re: Can't control brightness with nvidia

Nevermind the last post.

dmesg with nvidia installed and running a DE:
http://pastebin.com/fmLcQ9GF

Pretty much gibberish to me.
edit: Only thing I found at line 867:
[    7.245285] nvidia: module license 'NVIDIA' taints kernel.
[    7.245289] Disabling lock debugging due to kernel taint
It seem's it's not even relevant:
http://ubuntuforums.org/showthread.php?t=1039048

BTW now I have
/sys/class/backlight/sony/brightness

Probably because I uninstalled nvidiabl/nvidia-bl drivers.

Still no brightness control

Last edited by snoxu (2012-11-27 19:45:04)

snoxu

Member

Registered: 2010-01-24

Posts: 141

Re: Can't control brightness with nvidia

Until I find a solution for Nvidia drivers I'll make do with nouveau with no vdpau

It is doing my head in trying to find a solution to get brightness control to work with nvidia

With nouveau I can echo the brightness file without any special wizardry and it works (Fn+brightness keys do not work though). It leads me to believe something is missing or might be wrong with the current Nvidia or nvidiabl does not work for my card.

Both drivers have the backlight/sony directory.

Nouveau additionally has backlight/nv_backlight

With nvidia I have to install nvidiabl to get this additional directory, but even with nvidiabl brightness control does not work.

Last edited by snoxu (2012-11-27 23:17:09)

brebs

Member

Registered: 2007-04-03

Posts: 3,742

Re: Can't control brightness with nvidia

These may be relevant:

[    0.301492] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
[    0.370115]  pci0000:3f: ACPI _OSC support notification failed, disabling PCIe ASPM

Maybe check ACPI

snoxu

Member

Registered: 2010-01-24

Posts: 141

Re: Can't control brightness with nvidia

These may be relevant:

[    0.301492] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
[    0.370115]  pci0000:3f: ACPI _OSC support notification failed, disabling PCIe ASPM

I googled that a bit. Seems related to some power management options.

I get the same thing in dmesg with nouveau where I'm able to control brightness manually.

So I would think that would rule out PCIe ASPM as the issue with nvidia.

Last edited by snoxu (2012-11-28 00:24:25)