Set property in RandR

[GordonYuan at viatech.com.cn]

Dear Dave,
    I know what you said. But I have another question now.
    If the property depends on other factor, for example, the TV output standard is related to mode size, if mode is 640x480, the supported values of certain property are NTSC, PAL, 720P and 1080I etc; but if mode is 720x480, the supported are NTSC, 720P and 1080I etc. PAL can't be supported any more.
    How can supported property value change dynamically according to mode? I think using RRConfigureOutputProperty() is a little difficult. 
    Please give me some advices, thanks!
Best wishes,
Gordon

-----Original Message-----
From: xorg-bounces at lists.freedesktop.org [mailto:xorg-bounces at lists.freedesktop.org] On Behalf Of Dave Airlie
Sent: 2009年3月12日 17:09
To: Gordon Yuan
Cc: xorg at lists.freedesktop.org
Subject: Re: Set property in RandR

2009/3/12  <GordonYuan at viatech.com.cn>:
> Dear Matthias:
>    You mean that the driver should set the output mode if necessary when the property changes. Maybe we can call the output.mode_set() in the function output.set_property().
>    Thanks for your kind help!
> Best wishes,
> Gordon

Its driver specific, so if say a TMDS coherent option is changed then
the mode needs to be reset,

Or if you have TV or LVDS scaling options you might also, need to change it.

However you might have some values that don't require it, like backlight control

Dave
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