Copyright (C) IBM Corporation 1993 README.APM v1.01 Aug 03, 93 ---------------------------------- Problems fixed in v1.0.1 ------------------------ 1) With version 1.0 the messages related to "DPMS Support Enabled" of the Windows Utility were not always displayed under the correct circumstances. This is now fixed. Advanced Power Management ------------------------- If you have a power manageable display attached to your system, and the display conforms to the VESA (Video Electronics Standards Association) DPMS (Display Power Management Signaling) interface, then using the Advanced Power Management driver will save you power. The APM driver does this by instructing your display to go into various power saving states, after a time of user inactivity has been detected. This readme file tells you how to install and use this feature. Installation for DOS -------------------- To use Advanced Power Management driver under DOS, you need a version of DOS which supports APM. Both IBM DOS v5.02 or greater and Microsoft MS-DOS v6.0 or greater, support APM. Run the UINSTALL program supplied on your APM utility diskette. Follow the instructions on the screen and select the "Install APM files for DOS" option. UINSTALL will copy the following files onto your hard disk - GPCAPM.EXE : The APM Device driver. APMMSG.GML : The message file for the APM device driver. README.APM : This readme file. Supplied with your version of APM compatible DOS there will be a device driver called POWER.EXE . Make sure that this driver is installed on your system and referenced in your config.sys file. For example if your DOS directory is C:\DOS then you should insert the following line into your CONFIG.SYS file. DEVICE=C:\DOS\POWER.EXE NOTE : you must insert this statement into CONFIG.SYS *after* the statement that UINSTALL inserted into config.sys to invoke your APM device driver. So you should end up with the following entries in your CONFIG.SYS file DEVICE=C:\DOS\GPCAPM.EXE /DPMS DEVICE=C:\DOS\POWER.EXE After completing changes to CONFIG.SYS, reboot your computer in order for these changes to take effect. Installation for Windows ------------------------ First, follow the installation instructions above for installing the DOS APM support. If you always run Windows rather than DOS, and you always run Windows in Enhanced mode ( which is the default ), then you do not have to load POWER.EXE in your CONFIG.SYS file. Now execute the UINSTALL program and select the "Install APM files for WINDOWS" option. Follow the instructions on the screen. During the install process, UINSTALL will ask you to input your Target Path. This should be your WINDOWS subdirectory and will normally be C:\WINDOWS . After UINSTALL has completed, you should have the following files added to your WINDOWS subdirectory - GPCAPM.DLL : Windows APM utility. MSG.DLL : Windows APM utility message file. GPCAPM.HLP : Windows APM utility help file. CTL3D.DLL : Three Dimensional button DLL. UINSTALL will also update your SYSTEM.INI file in your WINDOWS subdirectory and insert the following lines : [Power.Drv] OptionsDLL=C:\WINDOWS\GPCAPM.DLL Now, in order for Windows to use APM, the Windows SETUP program must be run as follows : Change directories to the directory where Windows is installed and type SETUP . Press C to Continue to the "system information" screen. Using the up and down arrow keys, move the selection bar to "COMPUTER" and press ENTER . From the list displayed, select "MS-DOS System with APM" and follow the displayed instructions until complete. Using Advanced Power Management ------------------------------- Both DOS and Windows Advanced Power Management will allow you to put your power manageable display in up to three different states which are : STANDBY : Minimum power saving, but immediate return to ON SUSPEND : Medium power saving and medium return to ON OFF : Maximum power saving, but some noticeable delay in returning to ON By default, these values will be set to : STANDBY 15 minutes SUSPEND 30 minutes OFF 60 minutes This means that if the user does not touch the keyboard or mouse for 15 minutes, then the display will go into STANDBY mode. 15 minutes later it will go to SUSPEND mode. 30 minutes later it will go to OFF mode. Whenever the user presses a key or moves the mouse, the display will return to ON. ON is the only state where the screen is not blanked. The user can set each of these time-out values from 1 to 99 minutes. Any of the three states may be disabled. See your display documentation for recommended settings. The recommended settings for the IBM PS/2 14" Energy Saving Color Monitor are: STANDBY 5 min. to 30 min. SUSPEND 20 min. to 50 min. OFF 40 min. to 70 min. Using Advanced Power Management with DOS ---------------------------------------- The APM DOS device driver can be executed like an application in order to change APM parameters. Alternatively, the parameters can occur on the device= line in CONFIG.SYS GPCAPM Parameter syntax : GPCAPM [/SBTO:mm] [/SUSPTO:mm] [/DSPOFFTO:mm] [/DPMS:x] where: mm = a time-out value in minutes (from 1 to 99). mm = NOW causes immediate entry into that power saving state. mm = DISABLE prevents the system from entering that state. x = YES - override the DPMS setting in the display's DMQS file. x = NO - do not override DPMS setting in the display's DMQS file. Only the initial letter of the keywords YES, NO, NOW, and DISABLE is required. For proper operation, the time out values should be chosen so that: SBTO is not greater than SUSPTO, and SUSPTO is not greater than DISPOFFTO. Example 1: gpcapm /sbto:2 /suspto:5 /dspoffto:15 /dpms:y Example 2: gpcapm dspoffto:NOW This would put your display in the OFF state immediately. Using Advanced Power Management with Windows -------------------------------------------- When the Windows has been setup to run on a "MS-DOS System with APM" and windows detects that you have the GPCAPM driver loaded, then a Power Management Icon will appear when you open the Windows Control Panel. Click on the Power icon and you will see the Power panel with a Power Management Combo box. Click on the down arrow and select "Advanced" to enable power management of your display. Click on options to go to the Power Management Options panel. Here you are able to change time-out values for different power saving states, enable or disable states, or make your display go into one of the power saving states immediately. For proper operation, the time out values should be chosen so that: STANDBY timeout is not greater than SUSPEND timeout, and SUSPEND timeout is not greater than OFF timeout. Click on the "Help" button on the Power Management Options Panel for further information. IMPORTANT NOTES --------------- 1) If your display is power manageable, you should never use XGA-2 v2.1 DMQS files with the XGA-2 v2.02 Display Driver. Always install the DMQS files that come on your XGA-2 Device Driver diskette. 2) If you install XGA Display Drivers V2.02 and you have a power manageable display, the right way to enable the power saving capability of the display is to use the APM DOS or Windows utility to force DPMS support to be enabled. If you are running the Windows utility, exit Windows and reboot your system to bring the override into effect. If you ever connect a non-DPMS display to your system, remember to remove this override. 3) If you are in any of the power saving states, press any key or move the mouse to bring the display back to ON state. Note that the key used to bring back the display will be passed to your application, so try to use a key that usually does not cause any action. For example, the "Shift" key, or the "Ctrl" key. Moreover if you are in Windows full screen DOS prompt, DON'T use the Ctrl-Esc combination key to bring back the display as this will put the display into an erroneous state.