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OK, so this isn't a hugely Earth-shattering idea, but it's basically that when the monitor goes into standby or is turned off, it sends a signal to the graphics hardware to save the display as a PNG to RAM or backing storage (security problem there), which then completely turns off subject to not overheating.
When the monitor comes back off standby, it reloads the image.
PC Power Saving Guide
http://saf.bio.calt...u/saving_power.html
[bigsleep, Jan 13 2009]
[link]
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Except that on Windows XP at least, when you wake up the computer again you see the logon screen. Not what the old screenshot shows. Making the screenshot useless. |
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//Except that on Windows XP at least, when you wake up the computer again you see the logon screen. Not what the old screenshot shows. Making the screenshot useless.//
That depends on your settings. |
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Indeed. I've never had a PC set up that way. |
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The image in the video ram is only of use to the DSP that refreshes the monitor. Software apps use their own buffers. |
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//The image in the video ram is only of use to the DSP that refreshes the monitor//
I thought that in most architectures, it was the DSP (or graphics processor) that wrote into the video RAM, and a fairly simple address-generator and state machine that reads it out to refresh the monitor. |
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//I thought that in most architectures// |
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That would be the windowed type OS's that demand applications support a 'Paint' function to remake their own screen area when required. Makes the idea pointless I'm afraid. |
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It does mean, though, that instead of bothering to do that you could just turn the hardware off completely after it got cool enough. Is that done already as well? |
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19th, well I'm pretty much in the dark there but I did see something about card power management a while ago. Sure enough if you go into My Computer properties, Hardware/Device Manager, for each device you can view its supported power options and how they map to various power states e.g. Sleeping. |
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OK, thanks. I got the following: |
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S0 -> D0
S1 -> D1
S2 -> Unspecified
S3 -> Unspecified
S4 -> D3
S5 -> D3 |
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As a certain relative once said, "This means nothing to me". I have no idea what to make of that. It's an ATI Radeon 9700 if that helps. |
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[copro], yeah that's what I meant, although that technically is still a type of DSP. |
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[link] tells you how to change power settings with screensaver (probably the best you can do for the card). |
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