On 12 Mar 2003, Benjamin Herrenschmidt wrote:
> On Tue, 2003-03-11 at 21:49, Mark Vojkovich wrote:
> > It's worth considering a helper function in the core server
> > on Linux PPC that knows how to talk to the IVAD controller.
> > These drivers could call it at the appropriate times. If
> > it's just one function call in the driver and if they whole
> > think is conditionally built, I don't think that sounds too bad.
>
> OK. Well, since I want also normal userland acess to it
> (so the user can change the brightness or screen geometry),
> I think the best is to move all of that stuff to a cmdline
> tool and have XFree call it with approriate parameter from
> that hook. That's also the best way to keep the XFree part
> of the code OS neutral (the external userland tool can then
> be ported on *BSD to whatever mecanism they provide for i2c
> communication on the CUDA and PMU busses).
>
> I'll add an xf86RunHelper() too lnx_init.c for now at least.
> The helper will run with the same uid as X itself (typically
> root), so can be a potential security hole, so I plan to
> hard code the path to the helper (/usr/sbin/xmodehelper ?)
This may be enough to kill this idea.
Mark.
>
> The arguments will be an action and a modeline. Action for
> now can be "mode_begin" and "mode_end", though I think I
> will also hook it in the DPMS functions of the driver as It
> is the only way to properly power down the IVAD (and so the
> CRT).
>
> Any more comments welcome while I'm busy coding the tool...
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