NAME

SYNOPSIS

DESCRIPTION

mode

Select a new video mode. The modes currently recognized are: 80x25, 80x30, 80x43, 80x50, 80x60, 132x25, 132x30, 132x43, 132x50, 132x60, VGA_40x25, VGA_80x25, VGA_80x30, VGA_80x50, VGA_80x60, VGA_90x25, VGA_90x30, VGA_90x43, VGA_90x50, VGA_90x60, EGA_80x25, EGA_80x43, VESA_132x25, VESA_132x43, VESA_132x50, VESA_132x60. The raster text mode VESA_800x600 can also be chosen. Alternatively, a mode can be specified with its number by using a mode name of the form MODE_⟨NUMBER⟩. A list of valid mode numbers can be obtained with the -i mode option. See Video Mode Support below.

foreground [

background

]

Change colors when displaying text. Specify the foreground color (e.g. “vidcontrol white”), or both a foreground and background colors (e.g. “vidcontrol yellow blue”). Use the show command below to see available colors.

show

See the supported colors on a given platform.

-b color

Set border color to color. This option may not be always supported by the video driver.

-C

Clear the history buffer.

-c setting[

,setting ...

]

Change the cursor appearance. The change is specified by a non-empty comma-separated list of settings. Each setting overrides or modifies previous ones in left to right order.

The following override settings are available:

normal

Set to a block covering 1 character cell, with a configuration-dependent coloring that should be at worst inverse video.

destructive

Set to a blinking sub-block with height scanlines starting at base. The name “destructive” is bad for backwards compatibility. This setting should not force destructiveness, and it now only gives destructiveness in some configurations (typically for hardware cursors in text mode). Blinking limits destructiveness. This setting should now be spelled normal,blink,noblock. A non-blinking destructive cursor would be unusable, so old versions of vidcontrol didn't support it, and this version doesn't have an override for it.

base=value, height=value

Set the specified scanline parameters. These parameters are only active in noblock mode. value is an integer in any base supported by strtol(3). Setting height to 0 turns off the cursor in noblock mode. Negative values are silently ignored. Positive values are clamped to fit in the character cell when the cursor is drawn.

The following modifier settings are available:

blink, noblink

Set or clear the blinking attribute. This is not quite backwards compatible. In old versions of vidcontrol, blink was an override to a blinking block.

block, noblock

Set or clear the block attribute. This attribute is the inverse of the flag CONS_CHAR_CURSOR in the implementation. It deactivates the scanline parameters, and expresses a preference for using a simpler method of implementation. Its inverse does the opposite. When the scanline parameters give a full block, this attribute reduces to a method selection bit. The block method tends to give better coloring.

hidden, nohidden

Set or clear the hidden attribute.

The following (non-sticky) flags control application of the settings:

charcolors

Apply base and height to the (character) cursor's list of preferred colors instead of its shape. Beware that the color numbers are raw VGA palette indexes, not ANSI color numbers. The indexes are reduced mod 8, 16 or 256, or ignored, depending on the video mode and renderer.

mousecolors

Colors for the mouse cursor in graphics mode. Like charcolors, except there is no preference or sequence; base gives the mouse border color and height gives the mouse interior color. Together with charcolors, this gives 2 selection bits which select between only 3 of 4 sub-destinations of the 4 destinations selected by default and local (by ignoring mousecolors if charcolors is also set).

default

Apply the changes to the default settings and then to the active settings, instead of only to the active settings. Together with local, this gives 2 selection bits which select between 4 destinations.

shapeonly

Ignore any changes to the block and hidden attributes.

local

Apply the changes to the current vty. The default is to apply them to a global place and copy from there to all vtys.

reset

Reset everything. The default is to not reset. When the local parameter is specified, the current local settings are reset to default local settings. Otherwise, the current global settings are reset to default global settings and then copied to the current and default settings for all vtys.

show

Show the current changes.

-d

Print out current output screen map.

-f [

[

size

] file

]

Load font file for size (currently, only 8x8, 8x14 or 8x16). The font file can be either uuencoded or in raw binary format. You can also use the menu-driven vidfont(1) command to load the font of your choice.

Size may be omitted, in this case vidcontrol will try to guess it from the size of font file.

When using vt(4) both size and font can be omitted, and the default font will be loaded.

Note that older video cards, such as MDA and CGA, do not support software font. See also Video Mode Support and EXAMPLES below and the man page for either syscons(4) or vt(4) (depending on which driver you use).

-g geometry

Set the geometry of the text mode for the modes with selectable geometry. Currently only raster modes, such as VESA_800x600, support this option. See also Video Mode Support and EXAMPLES below.

-h size

Set the size of the history (scrollback) buffer to size lines.

-i active

Shows the active vty number.

-i adapter

Shows info about the current video adapter.

-i mode

Shows the possible video modes with the current video hardware.

-l screen_map

Install screen output map file from screen_map. See also syscons(4) or vt(4) (depending on which driver you use).

-L

Install default screen output map.

-M char

Sets the base character used to render the mouse pointer to char.

-m on | off

Switch the mouse pointer on or off. Used together with the moused(8) daemon for text mode cut & paste functionality.

-p

Capture the current contents of the video buffer corresponding to the terminal device referred to by standard input. The vidcontrol utility writes contents of the video buffer to the standard output in a raw binary format. For details about that format see Format of Video Buffer Dump below.

-P

Same as -p, but dump contents of the video buffer in a plain text format ignoring nonprintable characters and information about text attributes.

-H

When used with -p or -P, it instructs vidcontrol to dump full history buffer instead of visible portion of the video buffer only.

-r foreground background

Change reverse mode colors to foreground and background.

-S on | off

Turn vty switching on or off. When vty switching is off, attempts to switch to a different virtual terminal will fail. (The default is to permit vty switching.) This protection can be easily bypassed when the kernel is compiled with the DDB option. However, you probably should not compile the kernel debugger on a box which is supposed to be physically secure.

-s number

Set the active vty to number.

-T xterm | cons25

Switch between xterm and cons25 style terminal emulation.

-t N | off

Set the screensaver timeout to N seconds, or turns it off.

-x

Use hexadecimal digits for output.

Video Mode Support

Format of Video Buffer Dump

0

Black

1

Blue

2

Green

3

Cyan

4

Red

5

Magenta

6

Brown

7

Light Grey

0

Dark Grey

1

Light Blue

2

Light Green

3

Light Cyan

4

Light Red

5

Light Magenta

6

Yellow

7

White

53 43 52 53 48 4f 54 5f 01 02 50 19 
----------------------- -- -- -- -- 
          |              |  |  |  ` 25 decimal 
          |              |  |  `--- 80 decimal 
          |              |  `------ 2 remaining bytes of header data 
          |              `--------- File format version 1 
          `------------------------ Literal "SCRSHOT_"

VIDEO OUTPUT CONFIGURATION

Boot Time Configuration

blanktime

Sets the timeout value for the -t option.

font8x16, font8x14, font8x8

Specifies font files for the -f option.

scrnmap

Specifies a screen output map file for the -l option.

Driver Configuration

FILES

/usr/share/syscons/fonts/*

 

/usr/share/vt/fonts/*

font files.

/usr/share/syscons/scrnmaps/*

screen output map files (relevant for syscons(4) only).

EXAMPLES

SEE ALSO

AUTHORS

CONTRIBUTORS