VGA(3) VGA(3) NAME vga - VGA controller device SYNOPSIS bind #v /dev /dev/vgactl DESCRIPTION The VGA device allows configuration of a graphics controller on a PC. 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 arch(3), it is used to implement configuration and setup of VGA controller cards. This is usually per- formed by vga(8). Writing strings to vgactl configures the VGA device. The following are valid commands. size XxYxZ chan Set the size of the screen image to be X pixels wide and Y pixels high. Each pixel is Z bits as specified by chan, whose format is described in image(6). actualsize XxY Set the physical size of the display to be X pixels wide by 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 size 1408x1050 but actualsize 1400x1050. tilt value Set the tilt of the screen, altering the screen's ori- entation. The value can be one of: none, left, inverted and right. type ctlr Set the type of VGA controller being used. Ctlr is one of 3dfx, ark200pv, clgd542x, clgd546x, ct65545, cyber938x, et4000, geode, hiqvideo, i81x, igfx, mach64xx, mga2164w, mga4xx, neomagic, nvidia, radeon, s3, t2r4 and vmware. Note that this list does not indicate the full set of VGA chips supported. For example, s3 includes the 86C801/5, 86C928, Vision864, and Vision964. It is the job of vga(8) to recognize which particular chip is being used and to initialize it appropriately. VGA(3) VGA(3) hwgc gc Set the type of hardware graphics cursor being used. Gc is one of soft, 3dfxhwgc, ark200pvhwgc, bt485hwgc, clgd542xhwgc, clgd546xhwgc, ct65545hwgc, cyber938xhwgc, et4000hwgc, geodehwgc, hiqvideohwgc, i81xhwgc, igfxhwgc, mga2164whwgc, mach64xxhwgc, neomagichwgc, nvidiahwgc, radeonhwgc, rgb524hwgc, s3hwgc, t2r4hwgc, tvp3020hwgc, tvp3026hwgc and vmwarehwgc. A value of off disables the cursor. palettedepth d Set the number of bits of precision used by the VGA palette to d, which must be either 6 or 8. hwaccel mode Depending on whether mode is on or off, enable or dis- able whether hardware acceleration (currently for rect- angle filling and moving) used by the graphics engine. The default setting is on. softscreen mode Depending on whether mode is on or off, enable or dis- able shadow framebuffer to reduce slow bus reads. Enabling softscreen disables hardware acceleration. The default setting is off except for the vesa driver. hwblank mode Depending on whether mode is on or off, enable or dis- able the use of DPMS blanking (see mouse(3)). linear size align Use a linear screen aperture of size size aligned on an align-byte boundary. drawinit Initialize the graphics hardware. This must be sent after setting the type. Reading vgactl returns the current settings, one per line. EXAMPLES The following disables hardware acceleration. echo hwaccel off > /dev/vgactl SOURCE /sys/src/9/pc/devvga.c SEE ALSO arch(3), vga(8) BUGS VGA(3) VGA(3) The hardware graphics cursor on the et4000 does not work in 2x8-bit mode.