Do not display the screensaver

[Cui, Hunk]

Hi, Jackson,
	First thanks for your explanation, through the debugging, I found when I start the "fade to black", the gamma values will be setup to the default value (1.0), it will be transferred to the XServer. And in XServer, the value will be write into the VidModeSetGamma -> xf86ChangeGamma -> xf86RandR12ChangeGamma -> gamma_to_ramp (calculate the RGB values) -> RRCrtcGammaSet. Now I have some difficulty. In gamma_to_ramp step, I found the type of ramp value is CARD16. Why is not the CARD8? For R,G,B values, it only have 256bytes RAM.
	Can you tell me the reason?

Looking forward to your reply.

Thanks,
Hunk Cui

-----Original Message-----
From: Adam Jackson [mailto:ajax at nwnk.net] 
Sent: Wednesday, May 19, 2010 12:00 AM
To: Cui, Hunk
Cc: xorg-devel at lists.x.org
Subject: Re: Do not display the screensaver

On Thu, 2010-05-13 at 11:26 +0800, Cui, Hunk wrote:
> Hi, all,
> 
>  The screensaver issue,
> 
>         About the xscreensaver question,
> 
>         1. In fade_screens functions (fade.c) it will call
> xf86_gamma_fade function at fade.c, I found it will fading in (from
> black), then first crank the gamma all the way down to 0, then take
> the windows off the screen, Why are the RGB values setup to 0? And
> what is mean about the fading in (from black)?

gnome-screensaver (which I assume is what you're looking at) changes the
gamma ramp to achieve the "fade to black" effect, because that looks
smoother than adjusting backlight levels.

- ajax