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To: freebsd-questions@FreeBSD.org, freebsd-bugs@FreeBSD.org
Subject: "Bug" in syscons?
Date: Tue, 14 Nov 1995 01:45:53 -0800
From: Darryl Okahata <darrylo@hpnmhjw.sr.hp.com>
Sender: owner-questions@FreeBSD.org
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[ I'm sorry about the cross-mailing to both questions and bugs, but I
  may have gotten inexplicably auto-deleted from the bugs mailing list,
  and I haven't had the time to cajole Majordomo into resubscribing me.
  Anyway, ... ]

     I've been having some text<-->graphics mode switching problems,
where switching from X-windows back to a syscons console resulted in
utterly corrupt fonts in my syscons consoles.  I tried using pcvt, and
the corrupt font problems went away.  After comparing the pcvt and
syscons sources, I came up with the included patch (relative to 2.0.5),
which solves my corrupt font problems with syscons.  Can anyone tell me
what the old 2.0.5 syscons is trying to do with the "weird" VGA register
values?  I know what my "fixed" values are doing, but what are the old
values trying to do?  (I just ordered a copy of Richard Wilton's
"Programmer's Guide to PC Video Systems", but it hasn't arrived yet.)

     I'm currently using a cheap (but fast) Hercules Stingray VL (Ark
Logic chipset) video card.  I also had similar problems with an ISA
Hercules Dynamite Pro (Tseng ET4000/W32p chipset), but I had originally
chalked that up to a buggy XF86_W32 accelerated server (which led me to
get the Stingray VL); maybe this patch would have fixed my ET4000/W32p
problem also?

     -- Darryl Okahata
	Internet: darrylo@sr.hp.com

DISCLAIMER: this message is the author's personal opinion and does not
constitute the support, opinion or policy of Hewlett-Packard or of the
little green men that have been following him all day.

===============================================================================
*** syscons.c.orig	Mon Nov 13 23:13:43 1995
--- syscons.c	Tue Nov 14 01:12:14 1995
***************
*** 2804,2819 ****
      outb(ATC, 0x30); outb(ATC, 0x01);
  #if SLOW_VGA
      outb(TSIDX, 0x02); outb(TSREG, 0x04);
!     outb(TSIDX, 0x04); outb(TSREG, 0x06);
      outb(GDCIDX, 0x04); outb(GDCREG, 0x02);
      outb(GDCIDX, 0x05); outb(GDCREG, 0x00);
!     outb(GDCIDX, 0x06); outb(GDCREG, 0x05);
  #else
      outw(TSIDX, 0x0402);
!     outw(TSIDX, 0x0604);
      outw(GDCIDX, 0x0204);
      outw(GDCIDX, 0x0005);
!     outw(GDCIDX, 0x0506);               /* addr = a0000, 64kb */
  #endif
  }
  
--- 2804,2819 ----
      outb(ATC, 0x30); outb(ATC, 0x01);
  #if SLOW_VGA
      outb(TSIDX, 0x02); outb(TSREG, 0x04);
!     outb(TSIDX, 0x04); outb(TSREG, 0x07);
      outb(GDCIDX, 0x04); outb(GDCREG, 0x02);
      outb(GDCIDX, 0x05); outb(GDCREG, 0x00);
!     outb(GDCIDX, 0x06); outb(GDCREG, 0x00);
  #else
      outw(TSIDX, 0x0402);
!     outw(TSIDX, 0x0704);
      outw(GDCIDX, 0x0204);
      outw(GDCIDX, 0x0005);
!     outw(GDCIDX, 0x0006);               /* addr = a0000, 64kb */
  #endif
  }
  
***************
*** 2827,2833 ****
      outb(ATC, 0x30); outb(ATC, 0x0C);
  #if SLOW_VGA
      outb(TSIDX, 0x02); outb(TSREG, 0x03);
!     outb(TSIDX, 0x04); outb(TSREG, 0x02);
      outb(GDCIDX, 0x04); outb(GDCREG, 0x00);
      outb(GDCIDX, 0x05); outb(GDCREG, 0x10);
      if (crtc_addr == MONO_BASE) {
--- 2827,2833 ----
      outb(ATC, 0x30); outb(ATC, 0x0C);
  #if SLOW_VGA
      outb(TSIDX, 0x02); outb(TSREG, 0x03);
!     outb(TSIDX, 0x04); outb(TSREG, 0x03);
      outb(GDCIDX, 0x04); outb(GDCREG, 0x00);
      outb(GDCIDX, 0x05); outb(GDCREG, 0x10);
      if (crtc_addr == MONO_BASE) {
***************
*** 2838,2844 ****
      }
  #else
      outw(TSIDX, 0x0302);
!     outw(TSIDX, 0x0204);
      outw(GDCIDX, 0x0004);
      outw(GDCIDX, 0x1005);
      if (crtc_addr == MONO_BASE)
--- 2838,2844 ----
      }
  #else
      outw(TSIDX, 0x0302);
!     outw(TSIDX, 0x0304);
      outw(GDCIDX, 0x0004);
      outw(GDCIDX, 0x1005);
      if (crtc_addr == MONO_BASE)