[Intel-gfx] Legacy backlight control with KMS and BACKLIGHT property

Keith Packard keithp at keithp.com
Fri Aug 14 22:34:20 CEST 2009


On Fri, 2009-08-14 at 13:10 -0700, Greg KH wrote:

> Why?  /sys/class/backlight should expose 2 backlights if they are known
> and present, right?  Or is the problem that we don't expose new screens
> in sysfs for userspace to be able to work out which is which?

We don't know which backlight goes with which LVDS device...

> If so, then that should be fixed as well :)

It would be nice, but I haven't seen a proposal that attempts to address
this. Hiding the backlight behind a DRM interface would mean that future
fixes could be folded in without requiring changes in user-mode code.

-- 
keith.packard at intel.com
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