bugGNU GRUB - Bugs: bug #48100, Booting in blind mode on...


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bug #48100: Booting in blind mode on macmini-2,1

Submitted by:  Stefan Monnier <monnier>
Submitted on:  Thu 02 Jun 2016 03:28:59 PM UTC  
Category:  Terminal Severity:  Major
Priority:  5 - Normal Item Group:  None
Status:  None Privacy:  Public
Assigned to:  None Originator Name:  Stefan Monnier
Open/Closed:  Open Release: 
Release:  2.02~beta1 Reproducibility:  Every Time
Planned Release:  2.03+

( Jump to the original submission)

Sun 05 Mar 2017 11:04:58 PM UTC, comment #6: 

Does your config  contain insmod efi_gop?

Vladimir Serbinenko <phcoder>
Project Administrator
Mon 23 Jan 2017 04:33:03 PM UTC, comment #5: 

Still not sure what you mean by "your grub is started in text or graphical mode?".  rEFIt sure looks graphical, but after that Grub looks "plain text" (just like the legacy Grub1) and I don't use any graphical boot in Debian either (that is, until the boot finishes, at which point it does start X+GDM).

As for Git, I've now compiled Grub from Git, but I'm not sure what you want me to do with it: I haven't noticed any difference in the behavior.  Is there some "debug logging" option of some sort?

Stefan Monnier <monnier>
Sun 01 Jan 2017 07:55:58 PM UTC, comment #4: 

Not sure what you mean by "text or graphical mode".  Its started by rEFIt in "the default mode".  I could try to build it from Git master, if it can help, tho it'll take yet more time for me to get access to the machine and try that way of booting.

Stefan Monnier <monnier>
Thu 29 Dec 2016 08:22:26 AM UTC, comment #3: 

Just to be sure - your grub is started in text or graphical mode?

Do you have possibility to run git master? Then we could try some debugging what's going on.

Andrei Borzenkov <arvidjaar>
Project Member
Wed 28 Dec 2016 09:21:46 PM UTC, comment #2: 

Sorry 'bout the delay, but the system log didn't have the boot's dmesg any more, so I had to wait for an opportunity to reboot the machine.  Note that I go through the Grub boot a lot more often than I reboot, because I hibernate the machine fairly often.

I have now added the dmesg and grub.cfg.

Stefan Monnier <monnier>
Thu 15 Dec 2016 06:49:54 PM UTC, comment #1: 

Could you attach your grub.cfg and dmesg output after Linux is booted?

Andrei Borzenkov <arvidjaar>
Project Member
Thu 02 Jun 2016 03:28:59 PM UTC, original submission:  

I recently decided it was really time to start using the EFI boot instead of the legacy BIOS boot on my old Mac-Mini (an original Core Duo macmini-1,1 which I upgraded to Core 2 Duo macmini-2,1 via processor and firmware upgrades).

It all works fairly nicely, except that the beginning of the Linux boot is not displayed.  More specifically, I first get into Grub (via rEfit), then I can select the entry I want, it's all good, but when I finally decide to boot the OS grub tells me:

    No suitable video mode found
    Booting in blind mode

[ Not copy-pasted, but written from memory, so the wording may be slightly off. ]

The boot process then happens correctly but is not displayed until a bit later (probably when the kernel loads the i915 module and takes actual control of the graphics output.

This is on a Debian testing system, with package grub-efi-ia32 version 2.02~beta2-36, with a fairly minimal config file:

    % grep '^[^#]' /etc/default/grub
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

Not sure if it's relevant, but this macmini is connected to two displays (one via VGA and the other via DVI).  The firmware (just like OSX) only uses the DVI output (so it seems that this hardware configuration is not fully supported), but other than that it doesn't seem to cause any problem (the firmware displays things fine on the DVI output, including rEfit and Grub, and Linux afterwards happily takes control of both screens).

Stefan Monnier <monnier>


Attached Files
file #39328:  grub.cfg added by monnier (16KiB - application/octet-stream - Here are my grub.cfg as well as the dmesg soon after (re)booting)
file #39327:  dmesg.boot added by monnier (91KiB - application/octet-stream - Here are my grub.cfg as well as the dmesg soon after (re)booting)


Depends on the following items: None found

Items that depend on this one: None found


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-03-05 phcoder Planned ReleaseNone => 2.03+
    2016-12-28 monnier Attached File- => Added dmesg.boot, #39327
        Attached File- => Added grub.cfg, #39328

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