Hello Kay, On Mon, 5 Feb 2018 16:27:19 +0100 Kay Diederichs <kay.diederichs@xxxxxxxxxxxxxxx> wrote: > On 02/01/2018 12:15 PM, wwp wrote: > > Hello there, > > > > > > Dell XPS-15-9560 laptop (SSD drive, UEFI, secure boot off).. Windows 10 > > pre-installed, CentOS7 installed in a separate partition and running > > for months w/o issue. Don't know what happened but at reboot yesterday > > (not even booted in Windows, just rebooted), grub has disappeared, > > booted in Windows by default, which apparently has taken over the UEFI > > boot. > > > The DELL XPS-13-9360 in its BIOS has an option (named "auto boot > recovery" or similar - sorry the machine is somewhere else) that is by > default enabled. I guess you have it enabled as well. > > This option is triggered by two unsuccessful boot trials, and leads to > the loss of the grub menu, and restoration of the (non-grub) "Windows > boot manager" (or whatever it's called). > > After being bit by it once, I disabled it. At last I could reboot the system, and could verify that, you're right, there's a Bios option to restore factory settings in case of a (more or less) parametrable amount of boot failures. I disabled it as well, this is way too dangerous in case of booting from USB flashdrives (for instance) and can be enabled back if it's really needed. Thanks! Regards, -- wwp
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