suspend to ram resuming ok with vbe post - what does it mean?
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:
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.
'POST' stands for 'Power On Self Test' and is commonly used to mean 'kick the device into action, test yourself, come to life'. A fine example of POSTing is when you first turn on the machine, when you get the BIOS POST screen, where the memory is checked, etc..
Some video hardware and/or platforms do not properly kick the video card back into action and/or do not properly restore the video state as it was before you suspended.
VBEtool uses the LRMI (Linux Real Mode Interface) to do a couple assembly calls to the system BIOS interrupt routine, which in turn do an interrupt call to the video hardware, telling it to POST itself and come to life.
VBE stands for 'Video Bios Extention' if I remember correctly. VBEtool's purpose in life is to help these machines get their video sorted out, in such ways as resume/suspend issues, doing DPMS actions, turinig on/off the monitor or backlight, etc.
If you Google the 's2ram' tool and download/install it, you can configure it easily to perform the Video POST operation automatically, so you don't need to run the command blind from the console. Also, have a look into your BIOS on the computer-- some have a selection for whether or not to POST the video card after resume, and this might also work around (solve properly, actually) the issue.
Thank you for your detailed reply! It is by far a very comprehensive summary that I have come across the internet.
1. On suspending/resuming from console, I need the vbetool post command
2. On suspending/resuming from graphics mode (GNOME), if I Do Crtl+Alt+F1 (output still blank) and then Crtl+Alt+F7, I get my GNOME session back.
Also Windows XP resume just fine after suspend. Now that makes me think whether it is really a BIOS issue or a vga/graphics driver issue?
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