但具備 GUI 的 Linux 好似只有安裝在手提電腦的 Linux 發佈版才能設定螢幕光度
莫非一般桌面 Linux 不能螢幕光度 ?
Linux 本身其實都能夠設定螢幕光度，需要透過 xrandr 指令進行
輸入
1 | xrandr |
已連接的螢幕會顯示為 connected
輸入
1 | xrandr | grep -o '.\+ connected' |
例如閣下使用 VGA-0 要設定光度為 90%
輸入
1 | xrandr --output VGA-0 --brightness 0.90 |
但數值降至 0.10 實際上已經接近不能觀察
若不小心降至 0.10 以下看不到畫面，便需要按 Alt + Ctrl + F1 ~ F6 進入 tty 操作
但由於 tty 沒有 GUI ，使用 xrandr 後顯示 Can't not open display
輸入
1 | export DISPLAY=:0.0 |
1 | xrandr --output VGA-0 --brightness 1.00 |
xrandr 還能夠設定超越 100% 螢幕光度
即輸入
1 | xrandr --output VGA-0 --brightness 1.20 |
不過每次設定光度都要輸入指令顯示有點麻煩
在下借用 zenity 來進行互動操作方便調整光度
1 2 3 4 5 | while read b; do B=`echo "${b}" 100 | awk '{print $1/$2}'` B=`printf '%01.2f' "${B}"` xrandr --output VGA-0 --brightness "${B}"done < <(zenity --scale --title="Brightness Scaler" --text='' --value=100 --step=1 --min-value=10 --max-value=100 --print-partial) |
另一個版本可以自動檢查電腦連接的螢幕數量，可以個別或所有同時設定
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | #!/bin/bashifs=$IFSIFS=$'\n'ESCAPE="\\\\"NEWLINE="\\n"WIDTH='400'HEIGHT='250'TITLE='Brightness Scaler'MIN_VALUE='1'MAX_VALUE='10'ALL_SCREENS='All Screens'XRANDR=`xrandr --verbose`DEFAULT_SCREENS=`echo -n "${XRANDR}" | grep '.\+ connected' | sed -r 's/^(.+) connected.+/\1/g'`DEFAULT_BRIGHTNESSES=`echo -n "${XRANDR}" | grep '.\+Brightness: [0-9]\+\.[0-9]\+' | sed -r 's/.+Brightness: ([0-9]+\.[0-9]+)/\1/g'`while [ 1 ]; do selected_screen=`zenity --list --width="${WIDTH}" --height="${HEIGHT}" --title="${TITLE}" --text="Select a Screen" --column 'List of connected screen' "${ALL_SCREENS}" $(echo -n "${DEFAULT_SCREENS}") 2>/dev/null` if [ "${?}" = '0' ]; then if [ "${#selected_screen}" -eq '0' ] || [ "${selected_screen}" = "${ALL_SCREENS}" ]; then brightness=`echo -n $(echo -n "${DEFAULT_BRIGHTNESSES}" | sed -n '1p') "${MAX_VALUE}" | awk '{print $1 * $2}'` screen=`echo -n "${DEFAULT_SCREENS}" | sed -n '1p'` zenity --scale --title="${TITLE}" --text="Adjusting ${ALL_SCREENS} Brightness${NEWLINE}Using Screen '${screen}' as default brightness" --min-value="${MIN_VALUE}" --max-value="${MAX_VALUE}" --value="${brightness}" --print-partial 2>/dev/null | while read value; do for screen in `echo -n "${DEFAULT_SCREENS}"`; do brightness=`echo -n "${value}" "${MAX_VALUE}" | awk '{print $1 / $2}'` brightness=`printf '%01.2f' "${brightness}"` command="xrandr --output '${screen}' --brightness '${brightness}'" eval "${command}" done done if [ "${PIPESTATUS[0]}" = '0' ]; then DEFAULT_BRIGHTNESSES=`xrandr --verbose | grep '.\+Brightness: [0-9]\+\.[0-9]\+' | sed -r 's/.+Brightness: ([0-9]+\.[0-9]+)/\1/g'` else i='1' for screen in `echo -n "${DEFAULT_SCREENS}"`; do brightness=`echo -n "${DEFAULT_BRIGHTNESSES}" | sed -n "${i}p"` command="xrandr --output '${screen}' --brightness '${brightness}'" eval "${command}" i=$(($i+1)) done fi else i='1' for screen in `echo -n "${DEFAULT_SCREENS}"`; do if [ "${selected_screen}" = `echo -n "${DEFAULT_SCREENS}" | sed -n "${i}p"` ]; then break; fi i=$(($i+1)) done brightness=`echo -n $(echo "${DEFAULT_BRIGHTNESSES}" | sed -n "${i}p") "${MAX_VALUE}" | awk '{print $1 * $2}'` zenity --scale --title="${TITLE}" --text="Adjusting Screen '${selected_screen}' Brightness" --min-value="${MIN_VALUE}" --max-value="${MAX_VALUE}" --value="${brightness}" --print-partial 2>/dev/null | while read value; do brightness=`echo -n "${value}" "${MAX_VALUE}" | awk '{print $1 / $2}'` brightness=`printf '%01.2f' "${brightness}"` command="xrandr --output '${selected_screen}' --brightness '${brightness}'" eval "${command}" done if [ "${PIPESTATUS[0]}" = '0' ]; then DEFAULT_BRIGHTNESSES=`xrandr --verbose | grep '.\+Brightness: [0-9]\+\.[0-9]\+' | sed -r 's/.+Brightness: ([0-9]+\.[0-9]+)/\1/g'` else brightness=`echo -n "${DEFAULT_BRIGHTNESSES}" | sed -n "${i}p"` command="xrandr --output '${selected_screen}' --brightness '${brightness}'" eval "${command}" fi fi else break fidoneIFS=$ifs |
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