On Mon, Nov 4, 2024 at 9:22 AM Chris Green <[email protected]> wrote: > > On Mon, Nov 04, 2024 at 11:10:03AM +0000, Chris Green wrote: > > On Mon, Nov 04, 2024 at 05:34:49AM -0500, Felix Miata wrote: > > > > > > It's usually a good idea to disable CSM support (legacy/MBR booting), by > > > whatever > > > term your particular UEFI BIOS labels it. > > > > > The BIOS has "CSM Configuration", if I go into that I'm offered:- > > > > Launch CSM > > Boot option filter > > Launch PXE OpROM Policy > > > > If I disable "Launch CSM" then the other options disappear. With > > "Launch CSM" disabled when I reboot the system it just drops me into > > the BIOS diagnostic program and I can get no further. > > > > Similarly if I enable "Launch CSM" and set the "Boot option filter" to > > "UEFI only" then on reboot I simply end up in the BIOS diagnostic > > program again. > > > > Maybe I should try installing from scratch again with "Launch CSM" > > disabled? (I'm glad this is a fairly fast system!) > > > ... and if "Launch CSM" is disabled then when I boot from the Debain > 12 USB stick I just get dropped into the grub menu and I can't do an > install.
I've come across an Acer system that requires a BIOS password to unlock more BIOS menus and functionality. The BIOS password unlocked additional menus to change disk protocols and boot devices. After adding a password, I was able to switch to UEFI boot and enable SecureBoot. You might try to add a password to see if it unlocks additional menus for you. Jeff
