[Bug 104271] Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=104271

Hans Streibel  changed:

   What|Removed |Added

 CC||streibel.2...@gmx.net

--- Comment #6 from Hans Streibel  ---
As Alex suggested I moved this bug to Drivers/PCI to get more attention.
However now I have the impression that this bug does not get any attention at
all any more.

Did I miss any necessary action beside moving this to Drivers/PCI?

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[Bug 104271] Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=104271

Hans Streibel  changed:

   What|Removed |Added

  Component|kvm |PCI
Version|unspecified |2.5
Product|Virtualization  |Drivers

--- Comment #5 from Hans Streibel  ---
Ok, will move it to Drivers/PCI.

Output of lspci -vvv now is in the appendix.
Output of dmesg is not included because that only shows output of a
successfully booted kernel. I even installed bootlogd but its log file does not
show error messages.

I made some pictures with my camera but I do not dare to attach those somewhat
big jpg files here. But if you really need them I can attach them.

The trouble starts (most of the time) right behind the line:
shpchp: Standard Hot Plug PCI Controller Driver Version: 0.4

Yes, disabling VT-d did help. Booting succeeded again.
Using "iommu=pt" however did not help. Same symptoms.

BTW, I wanted to express that my special notebook is not broken.
Not more broken that all (many/most) of the others W520s around.

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[Bug 104271] Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=104271

--- Comment #4 from Hans Streibel  ---
Created attachment 187321
  --> https://bugzilla.kernel.org/attachment.cgi?id=187321=edit
Output of lspci -vvv

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[Bug 104271] Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=104271

Hans Streibel  changed:

   What|Removed |Added

Summary|Boot crashes on Lenovo W520 |Boot crashes on Lenovo W520
   |KVM and Discrete Graphic|with KVM and Discrete
   |enabled in BIOS |Graphic enabled in BIOS

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[Bug 104271] Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=104271

Huaitong Han  changed:

   What|Removed |Added

 CC||oen...@gmail.com

--- Comment #1 from Huaitong Han  ---
Does it work well on windows? I guess it's a BIOS problem. finding a avaliable
disk device is the job of BIOS, and the problem just right occurs when you
change the BIOS settings.

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[Bug 104271] Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=104271

--- Comment #2 from Hans Streibel  ---
Yes, it works on Windows 7. I did not recognize any problems there.
Ok, I did not try any virtualization like Virtual Box under Windows,
but everything else seems to work.

Even if it is a BIOS problem, then Windows obviously found a way to handle it.

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[Bug 104271] Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=104271

Alex Williamson  changed:

   What|Removed |Added

 CC||alex.william...@redhat.com

--- Comment #3 from Alex Williamson  ---
You might get more attention moving this bug to Drivers/PCI and including the
full dmesg or console log of the failure and lspci -vvv so we know something
about your system.  If it doesn't boot, there are always screen shots or
netconsole if you're serial port challenged.

KVM is a hypervisor, it has nothing to do with your system not booting.  More
likely it's something with the IOMMU.  Does disabling VT-d help?  What about
booting with iommu=pt?  BTW, reproducing on another W520 doesn't mean the
hardware isn't broken, it just means this isn't a point defect.  Hardware is
broken a disturbing amount of the time.

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