path: root/Documentation/VGA-softcursor.txt
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authorMauro Carvalho Chehab <>2016-09-21 09:51:11 -0300
committerMauro Carvalho Chehab <>2016-10-24 08:12:35 -0200
commit9d85025b0418163fae079c9ba8f8445212de8568 (patch)
tree4629e2dedf4a9ed45a6855c129101f9b52138372 /Documentation/VGA-softcursor.txt
parent186128f75392f8478ad1b32a675627d738881ca4 (diff)
docs-rst: create an user's manual book
Place README, REPORTING-BUGS, SecurityBugs and kernel-parameters on an user's manual book. As we'll be numbering the user's manual, remove the manual numbering from SecurityBugs. Signed-off-by: Mauro Carvalho Chehab <>
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-Software cursor for VGA
-by Pavel Machek <>
-and Martin Mares <>
-Linux now has some ability to manipulate cursor appearance. Normally, you
-can set the size of hardware cursor (and also work around some ugly bugs in
-those miserable Trident cards [#f1]_. You can now play a few new tricks:
-you can make your cursor look
-like a non-blinking red block, make it inverse background of the character it's
-over or to highlight that character and still choose whether the original
-hardware cursor should remain visible or not. There may be other things I have
-never thought of.
-The cursor appearance is controlled by a ``<ESC>[?1;2;3c`` escape sequence
-where 1, 2 and 3 are parameters described below. If you omit any of them,
-they will default to zeroes.
-first Parameter
- specifies cursor size::
- 0=default
- 1=invisible
- 2=underline,
- ...
- 8=full block
- + 16 if you want the software cursor to be applied
- + 32 if you want to always change the background color
- + 64 if you dislike having the background the same as the
- foreground.
- Highlights are ignored for the last two flags.
-second parameter
- selects character attribute bits you want to change
- (by simply XORing them with the value of this parameter). On standard
- VGA, the high four bits specify background and the low four the
- foreground. In both groups, low three bits set color (as in normal
- color codes used by the console) and the most significant one turns
- on highlight (or sometimes blinking -- it depends on the configuration
- of your VGA).
-third parameter
- consists of character attribute bits you want to set.
- Bit setting takes place before bit toggling, so you can simply clear a
- bit by including it in both the set mask and the toggle mask.
-.. [#f1] see ``#define TRIDENT_GLITCH`` in ``drivers/video/vgacon.c``.
-To get normal blinking underline, use::
- echo -e '\033[?2c'
-To get blinking block, use::
- echo -e '\033[?6c'
-To get red non-blinking block, use::
- echo -e '\033[?17;0;64c'