Re: [Linux-fbdev-devel] no backlight on radeon after recent kernel "upgrade"s

[James Simmons <jsimmons@infradead.org>]

> I built 2.6.20-mm2 without backlight support
> $> grep BACKLIGH /boot/config-2.6.20-mm2 
> # CONFIG_BACKLIGHT_LCD_SUPPORT is not set
> # CONFIG_FB_BACKLIGHT is not set
> # CONFIG_FB_RIVA_BACKLIGHT is not set
> # CONFIG_FB_RADEON_BACKLIGHT is not set
> 
> that "eliminated" the problem. Also I can see the screen with pure
> 2.6.20 with backlight support (whatever it does since after
> loading lcd, backlight modules, my /sys/class/{lcd,backlight} are empty):
> 
> *$> grep BACKLIGH /boot/config-2.6.20 
> # CONFIG_FB_BACKLIGHT is not set
> CONFIG_BACKLIGHT_LCD_SUPPORT=y
> CONFIG_BACKLIGHT_CLASS_DEVICE=m
> CONFIG_BACKLIGHT_DEVICE=y

You need to explictly enable the backlight for your fbdev driver. It 
doesn't do the selecting magically for you.
Jus do a make "favorite"config and go to the fbdev menu and select the 
backlight option for your fbdev driver.

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