라즈베리 파이 출력 변경(부팅 이후)

기본적으로는 부팅시에만 가능하고

tvservice라는 3rd party 유틸을 통해 변경은 가능하나

출력 방향만 바꾸지 해상도까지 변경되는건 아니고 오버스캔 되는 등의 문제가 있으니

완전한 해결책이라고 하긴 힘들듯.

pi@delta ~ $ tvservice -c "PAL 4:3"; fbset -depth 8; fbset -depth 16 Powering on SDTV with explicit settings (mode:2 aspect:1) pi@delta ~ $ tvservice -p; fbset -depth 8; fbset -depth 16 Powering on HDMI with preferred settings [링크 : https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=38020]

pi@raspberrypi ~ $ tvservice Usage: tvservice [OPTION]...   -p, --preferred                   Power on HDMI with preferred settings   -e, --explicit="GROUP MODE DRIVE" Power on HDMI with explicit GROUP (CEA, DMT, CEA_3D_SBS, CEA_3D_TB, CEA_3D_FP)                                       MODE (see --modes) and DRIVE (HDMI, DVI)   -t, --ntsc                        Use NTSC frequency for HDMI mode (e.g. 59.94Hz rather than 60Hz)   -c, --sdtvon="MODE ASPECT"        Power on SDTV with MODE (PAL or NTSC) and ASPECT (4:3 14:9 or 16:9)   -o, --off                         Power off the display   -m, --modes=GROUP                 Get supported modes for GROUP (CEA, DMT)   -M, --monitor                     Monitor HDMI events   -s, --status                      Get HDMI status   -a, --audio                       Get supported audio information   -d, --dumpedid <filename>         Dump EDID information to file   -j, --json                        Use JSON format for --modes output   -n, --name                        Print the device ID from EDID   -h, --help                        Print this information

pi@raspberrypi ~ $ fbset --help Linux Frame Buffer Device Configuration Version 2.1 (23/06/1999) (C) Copyright 1995-1999 by Geert Uytterhoeven Usage: fbset [options] [mode] Valid options:   General options:     -h, --help         : display this usage information     --test             : don't change, just test whether the mode is valid     -s, --show         : display video mode settings     -i, --info         : display all frame buffer information     -v, --verbose      : verbose mode     -V, --version      : print version information     -x, --xfree86      : XFree86 compatibility mode     -a, --all          : change all virtual consoles on this device   Frame buffer special device nodes:     -fb <device>       : processed frame buffer device                          (default is /dev/fb0)   Video mode database:     -db <file>         : video mode database file                          (default is /etc/fb.modes)   Display geometry:     -xres <value>      : horizontal resolution (in pixels)     -yres <value>      : vertical resolution (in pixels)     -vxres <value>     : virtual horizontal resolution (in pixels)     -vyres <value>     : virtual vertical resolution (in pixels)     -depth <value>     : display depth (in bits per pixel)     -nonstd <value>    : select nonstandard video mode     -g, --geometry ... : set all geometry parameters at once     -match             : set virtual vertical resolution by virtual resolution   Display timings:     -pixclock <value>  : pixel clock (in picoseconds)     -left <value>      : left margin (in pixels)     -right <value>     : right margin (in pixels)     -upper <value>     : upper margin (in pixel lines)     -lower <value>     : lower margin (in pixel lines)     -hslen <value>     : horizontal sync length (in pixels)     -vslen <value>     : vertical sync length (in pixel lines)     -t, --timings ...  : set all timing parameters at once   Display flags:     -accel <value>     : hardware text acceleration enable (false or true)     -hsync <value>     : horizontal sync polarity (low or high)     -vsync <value>     : vertical sync polarity (low or high)     -csync <value>     : composite sync polarity (low or high)     -gsync <value>     : synch on green (false or true)     -extsync <value>   : external sync enable (false or true)     -bcast <value>     : broadcast enable (false or true)     -laced <value>     : interlace enable (false or true)     -double <value>    : doublescan enable (false or true)     -rgba <r,g,b,a>    : recommended length of color entries     -grayscale <value> : grayscale enable (false or true)   Display positioning:     -move <direction>  : move the visible part (left, right, up or down)     -step <value>      : step increment (in pixels or pixel lines)                          (default is 8 horizontal, 2 vertical)