[ltp] T61 Brightness keys with 2.6.26 not working (NVIDIA)

[Jens Rutschmann]

tbart wrote on 15.01.2009 13:16:
> It seems my ACPI video part does not really work, as both
> /sys/class/backlight is emtpy and /proc/acpi/video is missing completely)

I have two entries in each of those directories. I have ACPI_VIDEO compiled into 
the kernel, while thinkpad_acpi is loaded as module. Perhaps the order in which 
the drivers get loaded is the problem?


> This is 2.6.27-gentoo-r7 (Jens, you also use gentoo, so I guess it can only
> be some small mistake on my side)

I'm using vanilla 2.6.27.6 together with the tp_smapi patch and I perhaps 
another tp_acpi version than you. Also I suggest you update your BIOS. If I 
remember correctly they changed some stuff regarding the brightness buttons 
since your version was released.

Here's my dmesg output:
[    6.095379] thinkpad_acpi: ThinkPad ACPI Extras v0.21-20081019
[    6.095381] thinkpad_acpi: http://ibm-acpi.sf.net/
[    6.095383] thinkpad_acpi: ThinkPad BIOS 7LETC4WW (2.24 ), EC 7KHT24WW-1.08
[    6.095385] thinkpad_acpi: Lenovo ThinkPad T61, model 6457W2C
[    6.096776] thinkpad_acpi: ACPI backlight control delay disabled
[    6.097603] thinkpad_acpi: radio switch found; radios are enabled
[    6.097766] thinkpad_acpi: This ThinkPad has standard ACPI backlight 
brightness control, supported by the ACPI video driver
[    6.097769] thinkpad_acpi: Disabling thinkpad-acpi brightness events by 
default...
[    6.111565] thinkpad_acpi: Lenovo BIOS switched to ACPI backlight control mode
[    6.111569] thinkpad_acpi: standard ACPI backlight interface available, not 
loading native one...


Best regards,
Jens