Re: `radeontool light off` does not turn off backlight

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.