Messages in this thread | | | Date | Wed, 19 Jul 2000 12:54:42 +0200 | From | Pierre Rousselet <> | Subject | Re: linux-kernel-digest V1 #1161 |
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<blockquote TYPE=CITE>From: James Simmons <jsimmons@acsu.buffalo.edu> <br>Date: Tue, 18 Jul 2000 14:51:15 -0400 (EDT) <br>Subject: Re: [BUG] 2.4.0-test4 and console <p>> > > I believe it's in card drivers. I tried 'VGA' driver (that came with <br>> > > XFree86) and console was ok. <br>> > > With 'nv' driver (came with XFree86 4.0.1) console dims at first start and <br>> > > in the second time it turns completely blank. <br>> > > With 'nvidia' driber (v0.94, from NVidia) console blanks totally at first <br>> > > start. <br>> > > Another interesting point is that with 'nv' console dims only when starting <br>> > > X (so I can restore console just by logging to another VT and 'reset', but <br>> > > with 'nvidia' console blanks always when I switch to X. <p>> Asus AGP-V3800 PRO/TV (TNT2PRO) on Asus P3B-F. <br>> XFree86-4.0.1 + NVIDIA 0.9-4 drivers + linux-2.4.0-test4 <p> I think I know what is causing the problem. I have seen this only <br>reported for NVIDIA cards and one time for a permidia card using vgacon. I <br>also need to to report video cards with XFree86-4.X that work. <br> What it sounds like that is happening is the gamma ramp is not being <br>reset when you VT switch out. When you VT switch out you are setting the <br>hardware state from a hires directcolor mode to a pseudo color VGA text <br>mode. The gamma ramp alters the color palette on a video card by making <br>all the color appear to be equally dimmed or brightened. What I think <br>previously when the console system set the color palette before the video <br>mode was changed it was programming on the legacy VGA color registers <br>which in effect reset the gamma ramp while in a hires video mode. Whereas <br>now you are setting the color palette once you are in VGA text mode which <br>is effected by the gamma ramp. So each time you VT switch the X server <br>keeps altering the gamma ramp until it makes all the colors black. Give <br>the NVIDIA fbdev drivers a try. If the fbdev drivers manage the gamma ramp <br>right I bet you will not have this problem. <br> <br> </blockquote>
<pre>The console blanks also with Voodoo3 when starting X (4.0.1). No more</pre>
<pre>problem when fb (tdfx) is compiled in the kernel (but I find fb is not comfortable</pre>
<pre>for scrolling on the console).</pre>
<pre>-- ------------------------- Pierre Rousselet <pierre.rousselet@wanadoo.fr> -------------------------</pre> </html>
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