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YouTubeの視聴中に画面が暗くなったり、画面ロックが開始されたりしないようにするにはどうすればよいですか？



How Prevent My Screen From Either Dimming



解決：

HOWTO：フラッシュの実行中にスクリーンセーバーを無効にする

ターミナルで次のコマンドを実行します。



mkdir -p ~/bin  
Open gedit, or your preferred text editor and type this:
 
#!/bin/bash # Cleanup any bad state we left behind if the user exited while flash was # running gconftool-2 -s /apps/gnome-screensaver/idle_activation_enabled --type bool true we_turned_it_off=0 while true; do sleep 60 flash_on=0 for pid in `pgrep firefox` ; do if grep libflashplayer /proc/$pid/maps > /dev/null ; then flash_on=1 fi ss_on=`gconftool-2 -g /apps/gnome-screensaver/idle_activation_enabled` if [ '$flash_on' = '1' ] && [ '$ss_on' = 'true' ]; then gconftool-2 -s /apps/gnome-screensaver/idle_activation_enabled  --type bool false we_turned_it_off=1 elif [ '$flash_on' = '0' ] && [ '$ss_on' = 'false' ]  && [ '$we_turned_it_off' = '1' ]; then gconftool-2 -s /apps/gnome-screensaver/idle_activation_enabled  --type bool true we_turned_it_off=0 fi done done  
Save this file as ~/bin/flash_saver.sh.
 
Go back into terminal and run:
 
chmod +x ~/bin/flash_saver.sh  
To run this, go into terminal and type:
 
~/bin/flash_saver.sh  
If you prefer, you can set this script to run at logon by doing the following:
 
     
  1. Run the program 'Startup Applications'
    2.  
  2. Click 'Add'
    3.  
  3. Under name type 'FlashMonitor' or something you will recognise
    4.  
  4. Under command type ~/bin/flash_saver.sh
    5.  
  5. Under comment (if you want) type a brief description. E.g. 'Stops screen turning off when Flash is running'
    6.  
 
  Source: HOWTO: Disable screen saver while Flash is running - ubuntuforums  
  
EDIT
 
This probably will not work if you are using an Ubuntu version newer than 12.04 (have tried in 13.04 and 13.10 and it just does not work at all). It seems the main developer is not working anymore in this project, so the chances of it being fixed are not good.
 
 
In my system (Ubuntu 11.10) i use Caffeine. You can try if it works in Xubuntu too. It adds a notification area icon where you can enable/disable screensaver for some programs. To install Caffeine, do the following:
 
sudo add-apt-repository ppa:caffeine-developers/ppa sudo apt-get update sudo apt-get install caffeine  
Then execute in a terminal:
 
caffeine -p &  
You can then choose the programs that should disable the screensaver:  
 vlc for VLC, mplayer for Movie Player, etc.
 
 Caffeine Preferences
 
Hope it helps.
  
There is a nice little script on GitHub called lightsOn which should do the trick you want.
 
Basically it looks for full screen video (flash in firefox or chromium, mplayer or vlc) and if so disable xscreensaver and also the auto power-manager dim screen capability.
 
from the script itself:
 
HOW TO USE: Start the script with the number of seconds you want the checks for fullscreen to be done. Example: './lightsOn.sh 120 &' will Check every 120 seconds if Mplayer, VLC, Firefox or Chromium are fullscreen and delay screensaver and Power Management if so. You want the number of seconds to be ~10 seconds less than the time it takes your screensaver or Power Management to activate. If you don't pass an argument, the checks are done every 50 seconds. 
したがって、ここでの私の答えに従って、自動起動フォルダからスクリプトを呼び出します。
 
flash / vlc / mplayerを実行しているかどうかに合わせてスクリプトを調整します
 
スクリプトに実行する権限を与えることを忘れないでください。
 
chmod + xlightsOn.sh