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why does sleep require video driver but hibernate does not?

post #1 of 4
Thread Starter 
A native install of windows 7 pro results in my graphics card, gtx 670, using the window drivers. This allows 2D graphics only. In the start menu is the option to hibernate or shut down but nothing for sleep or standby. Only after installing the graphics card driver does sleep/standby become an option. Why is this?
post #2 of 4
Most likely due to power state of video card.
And hibernate is suspend to disk instead of suspend to RAM which is sleep
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post #3 of 4
Quote:
Originally Posted by bwana View Post

A native install of windows 7 pro results in my graphics card, gtx 670, using the window drivers. This allows 2D graphics only. In the start menu is the option to hibernate or shut down but nothing for sleep or standby. Only after installing the graphics card driver does sleep/standby become an option. Why is this?

I guess you've gotten all the answer you need from here then?

http://forums.anandtech.com/showthread.php?t=2341291

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post #4 of 4
Thread Starter 
yes. but still not enough detail for me. specifically i was hoping for the particular code that the OS uses to go into standby with line by line explanation of all the system calls. and in particular was interested in how the OS accesses the bios to accomplish this process. Also when going into standby there is the peculiar paradox of shutting off devices one by one without causing a system error or corruption of the ram. after all, the ram is required for the cpu to function. as the os goes into standby, the ram is dynamically changing to reflect that. Once in standby mode, the ram as well as the cpu registers contain the 'go to sleep' code as well as all the flags that tell the devices on the motherboard to go to sleep. to change the contents of the ram and the cpu registers though you have to wake up the pc. But if you start to wake up the pc it should see this 'go to sleep' state and go back to sleep. eek.gif
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