ref: 217d2f751cae9fd59402bfc7c1f42989d6a2551e
dir: /sys/man/3/vga/
.TH VGA 3 .SH NAME vga \- VGA controller device .SH SYNOPSIS .nf .B bind #v /dev .B /dev/vgactl .fi .SH DESCRIPTION The VGA device allows configuration of a graphics controller on a PC. .B Vgactl allows control over higher-level settings such as display height, width, depth, controller and hardware-cursor type. Along with the I/O-port registers provided by .IR arch (3), it is used to implement configuration and setup of VGA controller cards. This is usually performed by .IR vga (8). .PP Writing strings to .B vgactl configures the VGA device. The following are valid commands. .TP .BI size " X" x Y x "Z chan" Set the size of the screen image to be .I X pixels wide and .I Y pixels high. Each pixel is .I Z bits as specified by .IR chan , whose format is described in .IR image (6). .TP .BI actualsize " X" x Y Set the physical size of the display to be .I X pixels wide by .I Y pixels high. This message is optional; it is used to accommodate displays that require the in-memory screen image to have certain alignment properties. For example, a 1400x1050 screen with a 1408x1050 in-memory image will use .B "size 1408x1050 but .BR "actualsize 1400x1050" . .TP .BI tilt " value" Set the tilt of the screen, altering the screen's orientation. The .I value can be one of: .BR none , .BR left , .B inverted and .BR right . .TP .BI type " ctlr" Set the type of VGA controller being used. .I Ctlr is one of .BR 3dfx , .BR ark200pv , .BR clgd542x , .BR clgd546x , .BR ct65545 , .BR cyber938x , .BR et4000 , .BR geode , .BR hiqvideo , .BR i81x , .BR igfx , .BR mach64xx , .BR mga2164w , .BR mga4xx , .BR neomagic , .BR nvidia , .BR radeon , .BR s3 , .BR t2r4 and .BR vmware . .IP Note that this list does not indicate the full set of VGA chips supported. For example, .B s3 includes the 86C801/5, 86C928, Vision864, and Vision964. It is the job of .IR vga (8) to recognize which particular chip is being used and to initialize it appropriately. .TP .BI hwgc " gc" Set the type of hardware graphics cursor being used. .I Gc is one of .BR soft , .BR 3dfxhwgc , .BR ark200pvhwgc , .BR bt485hwgc , .BR clgd542xhwgc , .BR clgd546xhwgc , .BR ct65545hwgc , .BR cyber938xhwgc , .BR et4000hwgc , .BR geodehwgc , .BR hiqvideohwgc , .BR i81xhwgc , .BR igfxhwgc , .BR mga2164whwgc , .BR mach64xxhwgc , .BR neomagichwgc , .BR nvidiahwgc , .BR radeonhwgc , .BR rgb524hwgc , .BR s3hwgc , .BR t2r4hwgc , .BR tvp3020hwgc , .BR tvp3026hwgc and .BR vmwarehwgc . A value of .B off disables the cursor. .TP .BI palettedepth " d" Set the number of bits of precision used by the VGA palette to .IR d , which must be either .B 6 or .BR 8 . .TP .BI hwaccel " mode" Depending on whether .I mode is .B on or .BR off , enable or disable whether hardware acceleration (currently for rectangle filling and moving) used by the graphics engine. The default setting is .BR on . .TP .BI softscreen " mode" Depending on whether .I mode is .B on or .BR off , enable or disable shadow framebuffer to reduce slow bus reads. Enabling .BI softscreen disables hardware acceleration. The default setting is .BR off except for the .BR vesa driver. .TP .BI hwblank " mode" Depending on whether .I mode is .B on or .BR off , enable or disable the use of DPMS blanking (see .IR mouse (3)). .TP .BI linear " size align" Use a linear screen aperture of size .I size aligned on an .IR align -byte boundary. .TP .B drawinit Initialize the graphics hardware. This must be sent after setting the .BR type . .PP Reading .B vgactl returns the current settings, one per line. .SH EXAMPLES The following disables hardware acceleration. .IP .EX echo hwaccel off > /dev/vgactl .EE .SH SOURCE .B /sys/src/9/pc/devvga.c .SH SEE ALSO .IR arch (3), .IR vga (8) .SH BUGS The hardware graphics cursor on the .B et4000 does not work in 2x8-bit mode.