`radeontool light off` does not turn off backlight

[David Airlie]

> 
> 
> using radeontool 1.6.2-1.1 from Debian Wheezy/testing [1]
> 
>         $ sudo radeontool --debug light off
>         Found card 1002:9555 (30000)
>         Radeon found. Base control address is 7f0746826000; base
>         framebuffer address is 7f0735e73000.
>         reading RADEON_LVDS_GEN_CNTL (2d0) is 00000000
>         writing RADEON_LVDS_GEN_CNTL (2d0) -> 00000000
> 
> does not turn off the backlight of the laptop monitor. This is a
> Lenovo
> G555 laptop with a ATI Radeon HD 4200 graphic device [2].
> 
> Do I need to submit a report to Freedesktop.org’s Bugzilla bug
> tracking
> system?
> 

radeontool doesn't support turning on/off backlights on newer GPUs, and I'm not sure I see any reason for it to do so.

It was originally in radeontool as a hack around lack of drivers.


Dave.