Bug#514395: LUT settings are not restored after switching to console.

[Kurt Roeckx]

On Wed, Feb 11, 2009 at 06:55:15PM +0100, Michel D?nzer wrote:
> On Wed, 2009-02-11 at 18:35 +0100, Kurt Roeckx wrote:
> > > 
> > > > or atleast get them restored when switching back to X.
> > > 
> > > What method does dispwin use for changing the LUT settings?
> > 
> > It uses this for randr 1.2:
> >                 XRRCrtcGamma *crtcgam;
> > 
> >                 debugr("Setting gamma using Randr 1.2\n");
> > 
> >                 if ((crtcgam = XRRAllocGamma(r->nent)) == NULL) {
> >                         debugr(" XRRAllocGamma failed\n");
> >                         return 1;
> >                 }
> > 
> >                 for (i = 0; i < r->nent; i++) {
> >                         crtcgam->red[i]   = vals[0][i];
> >                         crtcgam->green[i] = vals[1][i];
> >                         crtcgam->blue[i]  = vals[2][i];
> >                 }
> > 
> >                 XRRSetCrtcGamma(p->mydisplay, p->crtc, crtcgam);
> >                 XSync(p->mydisplay, False);             /* Flush the change out */
> > 
> >                 XRRFreeGamma(crtcgam);
> > 
> > Else it would use XF86VidModeSetGammaRamp()
> 
> At least with RandR 1.2, I suspect this could be an issue in the X
> server rather than the driver.

I've tried using xgamma (from x11-xserver-utils 7.3+5) and then the setting
are kept.  xgamma uses the XF86VidModeSetGamma() call.

I've rebuild dispwin so it uses the XF86VidModeSetGammaRamp() call instead
and then the settings are also kept.


Kurt