Kernel with backlight control

• Fn+F4: decrease brightness
• Fn+F5: Increase brightness
• Fn+Zzz: Turn off backlight
• Typing: turn on at last brightness.

Note: if you've lowered brightness to 0, you can only turn it back on again with Fn+F5. Look under attachments below on this page for the kernel.

As of now I've changed the calculation of the increments and decrements to a more logarithmic scale. The steps feel very natural. You can go very low (duty of 1), or to maxduty with only a few keystrokes.

Flashing? Try it first!

Feedback from skytone revealed that there are more types of mini-pc's that have different handling of the backlight. The elonex onet website also reveals 2 different uimages for the pro and the normal version. Anyway: Try it first: Look at UbootStuff of the key usage for booting, and look at CompilingAKernel for the specifics of the SD card.

NOTES

1. the trying stuff on the Letux-400 makes it permanent.
2. There is a bug that turns off wifi when brightness is adjusted or the screen is turned on. The probable cause is that gpio's are turned into pwms again.
3. The bug mentioned above is fixed

Register stuff :

b0050000	r8	control
b0050004	r16	period
b0050008	r16	duty
b0010074	r32	Auxiliary registers for the GPIO

• uimage: Kernel with backlight control
• skytone-080902-00-backlight.patch: Backlight patches