patch-2.1.9 linux/Documentation/svga.txt

• Lines: 53
• Date: Tue Nov 12 13:08:43 1996
• Orig file: v2.1.8/linux/Documentation/svga.txt
• Orig date: Mon May 13 12:58:55 1996

diff -u --recursive --new-file v2.1.8/linux/Documentation/svga.txt linux/Documentation/svga.txt
@@ -1,4 +1,4 @@
-			Video Mode Selection Support 2.9
+		       Video Mode Selection Support 2.10
 	      (c) 1995, 1996 Martin Mares, <mj@k332.feld.cvut.cz>
 --------------------------------------------------------------------------------
 
@@ -118,6 +118,7 @@
 	0x0f05	VGA 80x30 (480 scans, 16-point font)
 	0x0f06	VGA 80x34 (480 scans, 14-point font)
 	0x0f07	VGA 80x60 (480 scans, 8-point font)
+	0x0f08	Graphics hack (see the CONFIG_VIDEO_HACK paragraph below)
 
    0x1000 to 0x7fff - modes specified by resolution. The code has a "0xRRCC"
 	form where RR is a number of rows and CC is a number of columns.
@@ -163,6 +164,19 @@
 of the table (which also includes a video card name to be displayed on the
 top of the menu).
 
+   CONFIG_VIDEO_400_HACK - force setting of 400 scan lines for standard VGA
+modes. This option is intended to be used on certain buggy BIOS'es which draw
+some useless logo using font download and then fail to reset the correct mode.
+Don't use unless needed as it forces resetting the video card.
+
+   CONFIG_VIDEO_GFX_HACK - includes special hack for setting of graphics modes
+to be used later by special drivers (e.g., 800x600 on IBM ThinkPad -- see
+ftp://ftp.phys.keio.ac.jp/pub/XFree86/800x600/XF86Configs/XF86Config.IBM_TP560).
+Allows to set _any_ BIOS mode including graphic ones and forcing specific
+text screen resolution instead of peeking it from BIOS variables. Don't use
+unless you think you know what you're doing. To activate this setup, use
+mode number 0x0f08 (see section 3).
+
 5. Adding more cards
 ~~~~~~~~~~~~~~~~~~~~
    If you have a card not detected by the driver and you are a good programmer,
@@ -202,6 +216,10 @@
 end setting". Adding 0x8000 to the mode ID might fix the problem. Unfortunately,
 this must be done manually -- no autodetection mechanisms are available.
 
+   If you have a VGA card and your display still looks as on EGA, your BIOS
+is probably broken and you need to set the CONFIG_VIDEO_400_HACK switch to
+force setting of the correct mode.
+
 7. History
 ~~~~~~~~~~
 1.0 (??-Nov-95)	First version supporting all adapters supported by the old
@@ -244,3 +262,7 @@
 2.8 (14-Apr-96)	- Previous release was not compilable without CONFIG_VIDEO_SVGA.
 		- Better recognition of text modes during mode scan.
 2.9 (12-May-96)	- Ignored VESA modes 0x80 - 0xff (more VESA BIOS bugs!)
+2.10 (11-Nov-96)- The whole thing made optional.
+		- Added the CONFIG_VIDEO_400_HACK switch.
+		- Added the CONFIG_VIDEO_GFX_HACK switch.
+		- Code cleanup.