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[bug #47374] GRUB hangs for 2-3 minutes regularly w/ Libreboot 20150518

From: Bradley M. Kuhn
Subject: [bug #47374] GRUB hangs for 2-3 minutes regularly w/ Libreboot 20150518 on Lenovo T400 w/ DVD drive
Date: Wed, 09 Mar 2016 20:24:22 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 Iceweasel/38.6.1


                 Summary: GRUB hangs for 2-3 minutes regularly w/ Libreboot
20150518 on Lenovo T400 w/ DVD drive
                 Project: GNU GRUB
            Submitted by: bkuhn
            Submitted on: Wed 09 Mar 2016 03:24:21 PM EST
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Hardware-specific
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Bradley M. Kuhn
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
         Reproducibility: Every Time
         Planned Release: None



I have a stock Debian Jessie install with grub-pc 2.02~beta2-22+deb8u1
on a T400 with Libreboot 20150518 installed.

Boots fine if I just let it auto-boot and don't go to grub command line
(i.e., if it never tries to read/touch (achi1), which is the DVD drive).

If I hit 'c' and get the grub> prompt:

grub> ls

... works FINE, returning immediately if the DVD drive is *not* in the
ultrabay slot on the T400, but if I boot with the DVD drive in:

grub> ls
#  .... sits for 2-3 minutes

Then returns file listings as expected.

It's clearly related to (achi1), which is the DVD drive, because this:

grub> ls (ahci0,msdos2)/   # as an example

does not hang and returns expected rules.

But, do a:

grub> ls (ahci1)

and it hangs again for 2-3 minutes.

and returns:

error: AHCI transfer timed out.

During the hang, the HD light is illuminated but it never tries to
access the DVD drive.

Behavior is *better* if you put a DVD or CD into the drive.  The hang is
shorter, only about 30-60 seconds, and then things proceed normally.
You can even ls the files on the DVD or CD from the grub> prompt with:

grub> ls (ahci1)/

The "error: AHCI transfer timed out " never seems to appear when there's
a DVD in the drive.

Now, I read in this thread:

that it's probably a BIOS bug that causes this.  I'm all for blaming
proprietary BIOS for being broken.  But, in this case, I'm using
libreboot 20150208 so it's either a bug in libreboot, or a bug in GRUB.
The libreboot folks suspect it's a GRUB issue. :)


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