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When I choose sleep in the start menu. My PC simply does not go into sleep. I went through the device manager and did all the steps described here. So far this had no effect.

I've also installed Ubuntu 10.10 but I have the same problem (and in addition I don't know weather the kernel is configured correctly to support sleep) The mainboard is a Gigabyte P55A-UD4.

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What was your operating system before you installed Ubuntu 10.10? – Olli Feb 22 '11 at 20:16
    
ah didn't mention that.. Primary OS is windows 7; hard to guess, is it ;) – Nils Feb 22 '11 at 20:30

I did have that problem. It works again after marking Windows 7 partition as bootable in the MBR. I don't remember the source or if I figured it myself.

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How can I see which disk is the one the sys boots from? But I guess it's the second (physical!), while win is installed on the first one. So that could be the problem.. – Nils Feb 22 '11 at 21:19
    
The bootable flag in MBR is not used by Grub. But Windows seams to attach some importance to it. – shellholic Feb 24 '11 at 14:34
    
In Ubuntu, open GParted. Next to your Windows (NTFS) partition, in the "Flags", check that "boot" is present. If not, right-click -> "manage flags" -> check the box "boot" – shellholic Feb 24 '11 at 14:38

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