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2.4. XF86Config Tuning

There are essentially two different types of screen blanking that can be performed under X-Windows: BlankTime and DPMS. The first is simply a fake "blanking" effect that doesn't actually save any power. The others are specific only to DPMS-compliant monitors, and must be specifically enabled to take effect. They are located in your XF86Config file, which normally resides in /etc/X11/XF86Config.

DPMS (Display Power Management Signaling) is a standard to reduce power consumption in monitors [2]. Typically, both the monitor and the video card must support the DPMS standard in order to receive any benefit from it. DPMS specifies four modes of operation (in order of increasing power savings): "Normal", "Standby", "Suspend" and "Off". Two signal lines, "Horizontal Sync" and "Vertical Sync" provide a method for signaling these four different states to a DPMS monitor.

If you have a DPMS-compliant monitor, you might want to try enabling support for it under the Monitor section of your XF86Config file:

Section "Monitor"
	[... other values here ...]
	Option	"DPMS"
EndSection

To manipulate the DPMS functions, you can create/modify the following items in the ServerLayout section.

Section "ServerLayout"
	Option "BlankTime"	"10"	# Blank the screen in 10 minutes (Fake)
	Option "StandbyTime" 	"20"	# Turn off screen in 20 minutes (DPMS)
	Option "SuspendTime"	"30"	# Full hibernation in 30 minutes (DPMS)
	Option "OffTime"	"40"	# Turn off DPMS monitor (DPMS)
EndSection

BlankTime is not actually a power saving level at all. The screen is sent a "fake" blanking effect and defaults to activate after 10 minutes. Alternately, it can indicate the number of minutes until the screensaver should activate. It has nothing to do with DPMS.

StandbyTime is a very minor power saving level. This setting usually involves blanking the screen by turning off the electron (RGB) gun. However, the power supply is left on and the tube filaments energized. When you need to use the monitor again, the monitor will come back on very quickly. This option requires DPMS monitor/video-card support and defaults to 20 minutes under X-Windows. Also known as hsync suspend mode, since the horizontal sync signal is turned off to signal this power management state to a DPMS monitor.

SuspendTime is a very strong low power alternative. This setting usually involves the same power conservation as StandbyTime, however in addition the power supply is turned off. This option requires DPMS monitor/video-card support and defaults to 30 minutes under X-Windows. Also known as vsync suspend mode, since the vertical sync signal is turned off to signal this power management state to a DPMS monitor.

OffTime usually means just that. The computer monitor is turned off. A small auxiliary circuit stays on to monitor the signals from the computer to turn the monitor back on when data needs to be displayed to the screen. Obviously, this keeps power consumption to a bare minimum (zero). While the power saving is substantial, to reactivate the monitor may take up to 8-10 seconds. This option requires DPMS monitor/video-card support and defaults to 40 minutes under X-Windows. Both the horizontal and vertical sync signals are turned off to signal this power management state to a DPMS monitor.

After activating your changes and restarting X-Windows, you might want to examine your logfile to see if your video card has any problems with your changes:

$ egrep "^\(WW|EE\)" /var/log/XFree86.0.log

There may be additional options that you can enable for your specific video card/chip driver; see the XFree86 Documentation website for specifics.

Of course, all of this can also be activated "on-the-fly" by using xset(1). If you don't have access to your system's XF86Config file, a good place to put these commands would be in your ~/.Xsession or ~/.xinitrc file.

$ xset -dpms			# Disable DPMS
$ xset +dpms			# Enable DPMS
$ xset s off			# Disable screen blanking
$ xset s 150			# Blank the screen after 150 seconds
$ xset dpms 300 600 900		# Set standby, suspend, & off times (in seconds)
$ xset dpms force standby	# Immediately go into standby mode
$ xset dpms force suspend	# Immediately go into suspend mode
$ xset dpms force off		# Immediately turn off the monitor
$ xset -q			# Query current settings

If instead you're using the Linux console (not X-Windows), you'll want to use setterm(1):

$ setterm -blank 10		# Blank the screen in 10 minutes
$ setterm -powersave on		# Put the monitor into VESA power saving mode
$ setterm -powerdown 20		# Set the VESA powerdown to 20 minutes

[참고] MySQL 소스 컴파일시 Linuxthreads 에러 발생.

/usr/include/pthread.h 에 /* Linuxthreads */ 추가

echo '/* Linuxthreads */' >> /usr/include/pthread.h

위키백과 ― 우리 모두의 백과사전.

PE 포맷(Portable Excutable)은 32비트나 64비트 버전 마이크로소프트 윈도에서 사용되는 실행 파일의 파일 포맷을 말한다. 이를 지원하는 확장자로는 .exe, .obj, .dll, .sys가 있다.

완전한 도스에서 PE 포맷을 가진 파일을 실행하면 EXE 포맷과의 호환성을 위해 다음의 메시지들 가운데 하나를 띄워 도스에서 실행되지 않는다고 사용자에게 먼저 알린다.

  1. This program requires Microsoft Windows.
  2. This program cannot be run in DOS mode.

프로그램을 종료하는 마이크로소프트 도스 프로그램이 첫머리에 붙는다. (완전한 도스에서는 이 메시지를 띄운 뒤 바로 도스 프롬프트로 빠져 나오게 된다.) 그 뒤로 PE 고유의 식별자, COFF와 비슷한 데이터 구조가 있어서, MS-DOS 헤더에는 그 오프셋이 기록되어 있다. 또 다양한 CPU 아키텍처에 대응하기 위해서 내부에 판별을 위한 플래그를 갖는다. 실행할 때 DLL을 이용하여 함수들을 동적으로 링크하기 때문에 구성요소 수준의 버그 수정, 호환성 유지가 이루어질 수 있도록 되어 있다. 또, 리소스 영역에 아이콘 등을 보관할 수 있기 때문에, 그래픽 사용자 인터페이스 환경에서 아이콘이 표시되어 소프트웨어가 무엇인지 판별하기 쉽다.

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