Version:            (using KDE KDE 3.5.5)
Installed from:    Fedora RPMs
OS:                Linux

I have a sony vaio S170 laptop running FC5.  I installed/loaded the sonypi kernel module.  I set the permissions on /dev/sonypi to rw by all users.  I can see FN key presses being processes when I look at the verbose output in /var/log/messages, but the screen brightness and volume levels never change.  The control center vaio page shows current battery status correctly, however.  Also, klaptop recognizes that sonypi is working.  Upon investigating the FN key problem, I discovered a possible cause in the source (I don't know enough about linux/drivers/development to know if this actually is the problem).  in kvaiodriverinterface.cpp (part of kmilo/kvaio), it opens /dev/sonypi with read-only access.  The ioctl() calls that set the brightness have request names that indicate they're write operations, so it seems to me write access would be required.  I'm not sure if this relates to the lack of volume control or not, but as I previously stated, that also doesn't work.