On my Debian 5.0 system whenever I tried to wake up from suspend mode, I use to get blank screen although my machine was alive (I can ssh, etc.). After doing some research I found that executing the command:
right after resuming from suspend gave me back my video. Now upon reading the man vbetool I got this info:
post vbetool will attempt to run BIOS code located at c000:0003. This is the code run by the system BIOS at boot in order to intialise the video hardware. Note that on some machines (especially laptops), not all of this code is present after system boot - as a result, executing this command may result in undefined behaviour. This command must be run from a text console, as it will otherwise interfere with the operation of X.
However I am looking for some more information on this and how does it work so that I can understand clearly as to why I need to issue the command to get back my video.
Does anybody knows a good pointer which explains what does VBE, POST, etc. mean?
Note that I am doing all this from a console mode.