1.MDF based scheme ~~~~~~~~~~~~~~~~~~ OS: Doesn't support EDID, configured with MonitorType Auto Monitor is? Plugged in? Outcome? Recovery story? ---------- ---------- ------- -------------- Same model Yes Good image (most common situation) - as earlier No No image - No but later Good image (LoadModeFile loaded the MDF regardless) - reconnected Different model Yes Only a good image if earlier MDF works on new monitor Blind type *WimpMode, then run !Configure to choose new model than before No No image - No but later Only a good image if earlier MDF works on new monitor Blind type *WimpMode, then run !Configure to choose new model reconnected 2.EDID based scheme ~~~~~~~~~~~~~~~~~~~ OS: Does support EDID, has !Boot on read/write medium, EDID monitor was selected in !ScrnSetup Monitor is? Plugged in? Outcome? Recovery story? ---------- ---------- ------- -------------- Same model Yes Early boot uses CMOS MonitorType until monitor choices - as earlier obey file reached => good image (most common situation) No No image - No but later Only a good image if OS's default mode (SVGA?) supported Blind type *LoadModeFile reconnected or reboot Different model Yes Early boot uses CMOS MonitorType until monitor choices - than before obey file reached => good image (read from new monitor) No No image - No but later Only a good image if OS's default mode (SVGA?) supported Blind type *LoadModeFile reconnected or reboot 3.EDID based scheme softloaded on top of MDF only ROM ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ OS: Initial boot from old OS, as early as OS 3.50, softload does support EDID and was selected in !ScrnSetup Monitor is? Plugged in? Outcome? Recovery story? ---------- ---------- ------- -------------- Same model Yes Early boot uses Auto until softload starts then good - as earlier image (most common situation); if softload is not selected, loads MDF and behaves per scenario 1 No No image No but later Only a good image if OS's default mode (SVGA?) supported Blind type *LoadModeFile reconnected or reboot Different model Yes Early boot uses Auto until softload starts then good - than before image (read from new monitor) No No image - No but later Only a good image if OS's default mode (SVGA?) supported Blind type *LoadModeFile reconnected or reboot 4.EDID based scheme discless boot ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ OS: Does support EDID, no disc, or failed !Boot, configured MonitorType is EDID Monitor is? Plugged in? Outcome? Recovery story? ---------- ---------- ------- -------------- Same model Yes Preferred mode chosen (most common situation) - as earlier No No image - No but later Only a good image if OS's default mode (SVGA?) supported Blind type *LoadModeFile reconnected or reboot Different model Yes Preferred mode chosen (read from new monitor) - than before No No image - No but later Only a good image if OS's default mode (SVGA?) supported Blind type *LoadModeFile reconnected or reboot Notes ~~~~~ Monitors are required to return EDID data if connected in, even if not turned on - the EDID memory is powered by the motherboard. Therefore, the above tables only consider the connected/not connected possibilities since the monitor being off or on isn't important. Tables assume hotplug is not supported by the hardware, let alone the software, and that EDID data from the monitor is truthful. Hotplug support in a later version will remove all requirements to recover a bad mode choice by blind typing when the monitor is plugged in after booting, presently a reboot is required.