Created attachment 47512 [details]
dmidecode Fujitsu-Siemens SI2636

Hello devs,

First thank you for your great work on linux an make all this possible.

After compiling a 2.6.38-RC4 kernel i found that the brightness control 
off my laptop Fujitsu-Siemens SI 2636 don't work anymore.
The brightness control work with the fn+F8 an fn+F9 keys with all 
previous version off the kernel i tried from 2.6.24 to 2.6.37 .
My system is Kubuntu 10.04 LTS with the kernel mode-settings and the 
intel video driver.

In the dmesg output off the 2.6.37 kernel i found 2 related lines :

[Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness

[drm:intel_panel_get_max_backlight] *ERROR* fixme: max PWM is zero.

But even with those errors the brightness control work fine with the 
2.6.37 kernel.

When using the 2.6.38-RC4 kernel i found that the directory 
/sys/class/backlight is empty.

Attached is dmidecode.

If you need more info just tell me


Tasev Nikola