> From: James Simmons <jsimmons@acsu.buffalo.edu>
> Date: Tue, 18 Jul 2000 14:51:15 -0400 (EDT)
> Subject: Re: [BUG] 2.4.0-test4 and console
>
> > > > I believe it's in card drivers. I tried 'VGA' driver (that came with
> > > > XFree86) and console was ok.
> > > > With 'nv' driver (came with XFree86 4.0.1) console dims at first start and
> > > > in the second time it turns completely blank.
> > > > With 'nvidia' driber (v0.94, from NVidia) console blanks totally at first
> > > > start.
> > > > Another interesting point is that with 'nv' console dims only when starting
> > > > X (so I can restore console just by logging to another VT and 'reset', but
> > > > with 'nvidia' console blanks always when I switch to X.
>
> > Asus AGP-V3800 PRO/TV (TNT2PRO) on Asus P3B-F.
> > XFree86-4.0.1 + NVIDIA 0.9-4 drivers + linux-2.4.0-test4
>
> I think I know what is causing the problem. I have seen this only
> reported for NVIDIA cards and one time for a permidia card using vgacon. I
> also need to to report video cards with XFree86-4.X that work.
> What it sounds like that is happening is the gamma ramp is not being
> reset when you VT switch out. When you VT switch out you are setting the
> hardware state from a hires directcolor mode to a pseudo color VGA text
> mode. The gamma ramp alters the color palette on a video card by making
> all the color appear to be equally dimmed or brightened. What I think
> previously when the console system set the color palette before the video
> mode was changed it was programming on the legacy VGA color registers
> which in effect reset the gamma ramp while in a hires video mode. Whereas
> now you are setting the color palette once you are in VGA text mode which
> is effected by the gamma ramp. So each time you VT switch the X server
> keeps altering the gamma ramp until it makes all the colors black. Give
> the NVIDIA fbdev drivers a try. If the fbdev drivers manage the gamma ramp
> right I bet you will not have this problem.
>
>
The console blanks also with Voodoo3 when starting X (4.0.1). No more
problem when fb (tdfx) is compiled in the kernel (but I find fb is not comfortable
for scrolling on the console).
-- ------------------------- Pierre Rousselet -------------------------- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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