Nouveau - Oct 2012 - [Bug 55948] New: [nvd9 optimus] drm/nouveau/bios: attempt to fetch entire acpi rom image in one shot breaks module load

https://bugs.freedesktop.org/show_bug.cgi?id=55948

          Priority: medium
            Bug ID: 55948
          Assignee: nouveau at lists.freedesktop.org
           Summary: [nvd9 optimus] drm/nouveau/bios: attempt to fetch
                    entire acpi rom image in one shot breaks module load
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jano.vesely at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 68517
  --> https://bugs.freedesktop.org/attachment.cgi?id=68517&action=edit
kernel log of failed modprobe

modprobe nouveau hangs with repeated message:
nouveau W[   VBIOS][0000:01:00.0] DCB *ver 0x87 unknown (see attached log)

the card is: NVIDIA Corporation GF119 [Quadro NVS 4200M]
on dell Latitude E6420.

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--- Comment #1 from Jan Vesely <jano.vesely at gmail.com> ---
Created attachment 68518
  --> https://bugs.freedesktop.org/attachment.cgi?id=68518&action=edit
successful module load

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--- Comment #2 from Ben Skeggs <skeggsb at gmail.com> ---
I don't suppose you can copy /sys/firmware/acpi/tables/DSDT somewhere (copy
might be necessary to avoid getting a 0-byte file) and attach it for me?

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--- Comment #3 from Jan Vesely <jano.vesely at gmail.com> ---
Created attachment 68601
  --> https://bugs.freedesktop.org/attachment.cgi?id=68601&action=edit
DSDT acpi table

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Peter Wu <lekensteyn at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lekensteyn at gmail.com

--- Comment #4 from Peter Wu <lekensteyn at gmail.com> ---
The DSDT does not contain a _ROM method. It must be in one of the SSDT files,
can you run:

    acpidump > acpidump.txt
and attach the acpidump.txt file? You need to install acpidump first.

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--- Comment #5 from Jan Vesely <jano.vesely at gmail.com> ---
Created attachment 68619
  --> https://bugs.freedesktop.org/attachment.cgi?id=68619&action=edit
acpidump

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Ben Skeggs <skeggsb at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|nouveau at lists.freedesktop.o |skeggsb at gmail.com
                   |rg                          |

--- Comment #6 from Ben Skeggs <skeggsb at gmail.com> ---
Created attachment 68662
  --> https://bugs.freedesktop.org/attachment.cgi?id=68662&action=edit
fallback to slow _ROM access if checksum fails

How do you go if you apply this?

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