powering down (not just disabling) a discrete graphics card *at OS level* ? - Overclock.net - An Overclocking Community

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powering down (not just disabling) a discrete graphics card *at OS level* ?

 
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post #1 of 2 (permalink) Old 02-10-2019, 08:04 AM - Thread Starter
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powering down (not just disabling) a discrete graphics card *at OS level* ?

ok tis is a tricky one only the best of the best could answer this one :|

so I've a PC with TWO discrete GPU's (and aint got no iGPU)

this is my dual boot setup:

1) OS #1 is windows 10 using the main graphics card (a GTX 1050ti) in the first pcie slot

2) OS #2 is...a legacy windows using a secondary graphics card in the second pcie slot
(long explanation made short: I've had to install that OS recently on a 2nd partition & which I'll have to use on a reguler basis (more often than initially planned) there's no way around this so I'll be stuck with it for a while so that's that)

3) OS #2 CANNOT use GPU1: that GPU's too modern aint no drivers for it hence why I'd to use my spare card for it. I know it sux

> so to sum it up, OS1 uses GPU1, OS2 uses GPU2 (it was hard enough to get OS2 to use GPU2 even after disabling GPU1 in device manager, but I did it)

so both GPU's are connected to my monitor: GPU1 via HDMI, GPU2 via classic VGA


now I noticed OS2 only uses GPU2 after initialization - roughly around login time. in the logon windows GPU2 is used, but till then OS2 uses GPU1 even though I disabled it (I know this cause even if I unplug GPU2 from monitor, I still see OS2 boot up until around login time after which the screen goes black)

and here's the problem: even when booting OS2, GPU1 is still active, from the start, and until reset: which means my monitor receives signal both both GPU2 *and* GPU1 even if I boot into OS2

which means it prioritizes GPU1 even when booting into OS2

which means every time I boot into OS2 I've to manually switch input from HDMI1 to VGA in the monitor settings, to be able to see OS2 logon screen
quite annoying


so disabling GPU1 in BIOS is out of the question (not sure that's possible with my bios anyway it's a Z68 mobo) cause I still mostly use OS1

therefore I need to disable it on OS level, more specifically I need OS2 to automatically power down (not just disable as in device manager) the GPU1 - so that monitor no longer receives input from GPU1 & automatically switches to GPU2 input

how do I do that?

AFAIK there's no way to force windows to "put a component" to sleep like that

(btw in OS2 'sleep mode' is unavailable maybe cause GPU1 drivers cannot be installed)
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post #2 of 2 (permalink) Old 02-11-2019, 03:05 PM
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IDK how or what you could do with software to do this.

If both cards used PCIe cables, the easiest hardware hack would be to add a switch(s) on the PCIe cables to turn on/off the power from the each PCIe cable. The cards would still get some power from the mobo tho.


What ever u do, the whole thing sounds like a big hassle, not worth the effort.

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