On Thu, Aug 28, 2014 at 12:29 PM, Ron Leach <ronle...@tesco.net> wrote:
> On 28/08/2014 19:34, Kevin O'Gorman wrote: > >> Windows can't be the culprit -- it did not get control between the >> grub-update and the reboot, and even the first reboot went right to >> Windows. So there's something that GRUB failed to do. >> >> > That's a compelling remark. > > But, might it be that Secure Boot, which you said you'd enabled, can > (irrespective of Grub being there, somewhere) only find Windows as a > 'signed' OS so that is the only OS UEFI will load? > > [My understanding is that Secure Boot will only load a cryptographically > signed OS and that Windows is (so far) the only OS signed with a > certificate that is trusted by UEFI.] > > If that might be happening, have you tried turning OFF Secure Boot, so > that an unsigned [insecure] OS can be booted? BIOS might think that > Grub/Linux is untrusted because it is unsigned. > > [I'm assuming that UEFI can be used in 'insecure boot' mode. I don't mean > in 'Legacy' (CSM?) mode, which, as I understand it, is a different mode.] > > If the BIOS and Windows and Grub are - truly - this incapable of getting > along on your machine, might it be possible to ask the Windows boot loader > to load Grub/Linux, as a W8 boot loader choice? I'm not sure whether > that's possible? > > Let me say again, I don't have W8.1 but am finding out about this issue > (because I intend to get a W8.1 laptop). So what I say may be incorrect, > but I have looked at a lot of pages about this and those two suggestions > have been mooted elsewhere - though without follow-up indication whether > they worked. > > Regards, Ron > Hmm. I think we were both typing at the same time. GRUB and Windows do indeed work together in secure boot mode. Just not as well as I would like. So far. I have not turned off secure boot, and with a little effort I can boot to the OS I choose. There's a considerable interplay of hardware, firmware and software going on here. So I expect user experience will depend on the details of the machine you get. I'm running a Toshiba Sattelite laptop. -- Kevin O'Gorman programmer, n. an organism that transmutes caffeine into software. Please consider the environment before printing this email.
