Latest working kernel version: None Distribution: Any (I can perform tests and further debugging on Ubuntu 8.04, or possibly archlinux) Hardware Environment: Fujitsu-Siemens Lifebook p7010, intel 855GM. Problem Description: I first filed this bug at freedesktop against hal (http://bugs.freedesktop.org/show_bug.cgi?id=12638), but the hal guys suggested I take it over here. Basically, the problem is that hal cannot get/set backlight on my laptop since there is no sysfs interface to deal with that. Using Fn-F6/Fn-F7, I can manually change backlight. lshal | grep panel returns nothing. I'll attach the output of dmidecode. Please give me more information on how to debug this issue. Many thanks!
Created attachment 14963 [details] output of dmidecode on lifebook p7010
Will you please attach the output of dmesg and acpidump? Thanks.
Created attachment 15011 [details] output of acpidump
Created attachment 15012 [details] output of dmesg
I hope this helps. Regards, K.
the fujitsu laptop doesn't follow the ACPI video extension, thus we need a platform specific driver to handle the backlight stuff via it's private control method. Please set the CONFIG_FUJITSU_LAPTOP and see if it can work for you. If not, it means that your laptop is not supported currently.
Add the Jonathan Woithe in the cc list, who is the author of the fujitsu-laptop driver.
Thank you for pointing out CONFIG_FUJITSU_LAPTOP, I was not aware of this. I have now tried using this module, which results in a directory at /sys/devices/virtual/backlight/fujitsu-laptop populated with a few files. taking a look at the files 'max_brightness' and 'actual_brightness' seems to reveal correct information about maximum and actual brightness respectively. However, actual_brightness is read only, and I have no idea how I could influence the brightness using this interface. Neither hal, or the xbacklight tool seem to be able to use this interface either. This is the list of files created: actual_brightness bl_power brightness max_brightness power subsystem uevent
I'm sorry, I was too fast. It seems echoing to 'brightness' indeed sets brightness on my laptop. I say we close this bug, and I'll continue with the freedesktop guys...
Thanks for the confirmation that the driver works on your S7010. This bug can be closed.