Hello again, Vladimir. I know you're probably not back yet, but I figure I
better get this posted while I have time and it's fresh in mind.
About the blackout bug (or lack thereof), I tried 3 different things, neither
of which cured the blackout.
1. Followed "set root=(hd0,gpt3)" with "search --no-floppy --fs-uuid --set=root
EEBB-91C6" (new line below)
2. Removed "set root=(hd0,gpt3)", leaving "search --no-floppy --fs-uuid
--set=root EEBB-91C6"
3. Tried just your "search -s root -u EEBB-91C6" (no "set root=(hd0,gpt3)" or
"search --no-floppy --fs-uuid --set=root EEBB-91C6")
However, again, when I delete grub.cfg, this forces it into a working
commandline. There I toyed around. My thumb drive was again hd0 (but I believe
you that with some firmwares it's possible for the booted drive to not be
first). I set the root to (hd1,gpt1) to see if the "set by UUID" commands work.
I tried "search --no-floppy --fs-uuid --set=root EEBB-91C6", and sure enough,
my root was put back to (hd0,gpt3). I put it back to (hd1,gpt1), and tried your
"search -s root -u EEBB-91C6", which also set the root back to (hd0,gpt3).
So that proves that the syntax was dead-on. It looks like the blackout is not
related to a drivemapping or UUID issue.
I got a wee bit more intel. When it blacks-out, it says "Welcome to Grub!" like
usual, then "error: "prefix" is not set", which is the norm for me even when it
doesn't black-out, and then it spits something on the screen too briefly to
read. So I filmed it with a camera and reviewed the footage.
I couldn't make the letters out well, but here's the gist:
video/efi.???.c:248: GOP:codeo
video/efi.???/c:334: GOP:initializing FS @ ??..........
The only parts I'm sure about are the "video/efi.???" and the "initializing".
The numbers and everything else are sheer guesses.
This may seem to lead us into thinking that there is a video issue. But when it
doesn't blackout, the video works great, and the grub.cfg file is identical to
when it blacks-out and when it doesn't black-out. I'm thinking it must be
something the firmware saves in NVRAM to change it's behavior every-other time
or so to make it through a fit half the time. I don't see how anything in my
grub.cfg can be wrong if it works sometimes (other than the UUID thing - that
makes sense).
Here's the "settings" part of my grub.cfg (everything else is menu entries):
set default="0"
set timeout=100
set root=(hd0,gpt3)
set debug=video
insmod efi_gop
loadfont /boot/grub/unicode.pf2
set gfxmode=3488x2228
set gfxmode=keep
insmod gfxterm
terminal_output gfxterm
terminal gfxterm
insmod gettext
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
insmod jpeg
background_image /SysPics/CH.jpg
Regards,
Jake
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