I have a Thinkpad with a 2nd SSD with Ubuntu on it. Grub works fine on a cold boot. It works fine after a warm Ubuntu boot. But when warm booting from windows I get dumped to a grub> prompt. If I do an ls here, it shows all my (hd0) devices, but is missing the (hd1) devices where ubuntu is. If I cold boot and go to the grub prompt, then I can see the (hd1) devices. So something is going on whereby warm booting windows stops grub accessing (hd1). When the warm boot fails, I have to do a cold boot to fix it. In the bios I've got everything to do with secure boot turned off, and I can't see anything in there that would affect this.
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