Re: Debian 8 and Debian 9 Dual Boot
Dan Norton composed on 2017-12-21 16:53 (UTC-0500):
> Felix Miata wrote:
>> Dan Norton composed on 2017-12-21 14:07 (UTC-0500):
>>> There are still mysteries I have not solved. For some reason, GRUB has
>>> decided that after POST, you only need 3 seconds to choose which
>>> installation to boot. GRUB has resisted my efforts to change that
>>> timeout value. I've been able to change the boot order in NVRAM, but not
>>> the timeout.
>> efibootmgr -t ##
> Yes, it seems like that should work, but currently:
> # efibootmgr
> BootCurrent: 0000
> Timeout: 11 seconds # ... and the actual timeout is 3
> BootOrder: 0003,0001,0000,0002,0006,0004,0005
> Boot0000* debian
> Boot0001* USB Floppy/CD
> Boot0002* USB Hard Drive
> Boot0003* ATAPI CD-ROM Drive
> Boot0004* Unknown Device
> Boot0005* USB Floppy/CD
> Boot0006* Hard Drive
> Doing it again (See definition of insanity [1])
> # efibootmgr -t 12
> BootCurrent: 0000
> Timeout: 12 seconds
> BootOrder: 0003,0001,0000,0002,0006,0004,0005
> Boot0000* debian
> Boot0001* USB Floppy/CD
> Boot0002* USB Hard Drive
> Boot0003* ATAPI CD-ROM Drive
> Boot0004* Unknown Device
> Boot0005* USB Floppy/CD
> Boot0006* Hard Drive
> Well, that changed it from 3 to 4 (!?). Strange.
> [1] "Insanity is doing the same thing over & over again and expecting a
> different result." - Einstein
It's not so easy to figure out when POST is over with UEFI. Here, it seems
efibootmgr -t provides extra delay beyond what the BIOS defines for you to make
a selection from its own boot device selection menu, which requires an F12
keystroke here to see.
The timeout after appearance of Grub's menu is supposed to be controlled by
/etc/default/grub's GRUB_TIMEOUT=, which shows up here in Stretch's grub.cfg
first on line 86, a few lines before "### END /etc/grub.d/00_header ###".
--
"Wisdom is supreme; therefore get wisdom. Whatever else you
get, get wisdom." Proverbs 4:7 (New Living Translation)
Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
Felix Miata *** http://fm.no-ip.com/
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