From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 104271] New: Boot crashes on Lenovo W520 KVM and Discrete
 Graphic enabled in BIOS
Date: Wed, 09 Sep 2015 09:05:03 +0000
Message-ID: <bug-104271-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=104271

            Bug ID: 104271
           Summary: Boot crashes on Lenovo W520 KVM and Discrete Graphic
                    enabled in BIOS
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.1.6
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: streibel.2003@gmx.net
        Regression: No

Booting stops/crashes on a Lenovo W520 Notebook with these BIOS Settings:
- Virtualization
  Intel Virtualization Technology: Enabled
  Intel VT-d Feature: Enabled
- Display
  Boot Display Device: ThinkPad LCD
  Graphics Device: Discrete Graphics
  OS Detection for NVIDIA Optimus: Disabled

Booting starts and the last lines show that the kernel cannot access the hard
disks (lines starting with ata2 and ata1). The last lines are:

[ TIME ] Timed out waiting for device dev-disk-by\x2duuid-c30...4394b6b.device.
[ DEPEND ] Dependency failed for
/dev/disk/by-uuid/c305bd9f-9d6...7-359b94394b6b.
[ DEPEND ] Dependency failed for Swap.

After that booting stops.

Additional Information:
- This is no hardware fault. The error can be reproduced on a different W520.

- Booting also crashes with these kernels:
  -  3.16.0 (kernel from Debian Jessie)
  -  4.1.0 (backported kernel to Debian Jessie)

- Booting succeeds if:
  - both virtualization flags are set to Disabled in the BIOS
  or
  - Graphics Device is set to "Optimus" in the BIOS

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