Nouveau - Jan 2010 - [Bug 26349] New: nouveau_hybrid_setup: disables a discrete NVS 3100m on ThinkPad T410

http://bugs.freedesktop.org/show_bug.cgi?id=26349

           Summary: nouveau_hybrid_setup: disables a discrete NVS 3100m on
                    ThinkPad T410
           Product: xorg
           Version: git
          Platform: All
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: pav_s at freenet.de
         QAContact: xorg-team at lists.x.org


steps to reproduce:
 load the nouveau module (e.g. start fedora install, or so)

result:
 black screen & garbage in lspci

expected result:
 kms init + hi-res cnsole

explanation:

the module fails with the message
  [drm] nouveau 0000:01:00.0: _DSM hardware status gave 0x30040e3
  [drm] nouveau 0000:01:00.0: Unsupported chipset 0xffffffff

after a failed probe of the card, that disables the card:

01:00.0 VGA compatible controller: nVidia Corporation Device 0a6c (rev a2)
(prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 2142
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at cc000000 (32-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at ce000000 (64-bit, prefetchable) [size=32M]
        I/O ports at 2000 [size=128]
        [virtual] Expansion ROM at cd000000 [disabled] [size=512K]
        ...


turns into 

01:00.0 VGA compatible controller: nVidia Corporation Device 0a6c (rev ff)
(prog-if ff)
        !!! Unknown header type 7f


After changing  (result & 0x1) to (!(result & 0x1)) in
nouveau_hybrid_setup
everything works as expected.


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Matthew Garrett <mjg59 at srcf.ucam.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED




--- Comment #1 from Matthew Garrett <mjg59 at srcf.ucam.org>  2010-01-31
15:26:04 PST ---
Is this a hybrid graphics system?


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--- Comment #2 from Pavel S. <pav_s at freenet.de>  2010-02-01 03:49:37
PST ---
(In reply to comment #1)
> Is this a hybrid graphics system?
> 
Im' sorry, I forgot that last part of my post...

As far as I know it is something in between a real hybrid an just the discrete
graphics: the NVS 3100m is built on the mainboard, while there is Intel's
GPU
on the Arrandale CPU (connected through QPI AFAIK). At lest it should be there
-  I have neither seen it in the device manager in windows, nor in lspci.
Windows 7 can switch to "low power graphics" though...

( Does anybody know about these Arrandale GPU's? )


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--- Comment #3 from Matthew Garrett <mjg59 at srcf.ucam.org>  2010-02-01
04:52:44 PST ---
Ok - can you install the pmtools package and run the acpidump command as root,
then attach the output?


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--- Comment #4 from Pavel S. <pav_s at freenet.de>  2010-02-01 05:28:22
PST ---
Created an attachment (id=32966)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32966)
acpidump


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--- Comment #5 from Pavel S. <pav_s at freenet.de>  2010-02-01 05:30:26
PST ---
Created an attachment (id=32967)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32967)
lspci before loading nouveau


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--- Comment #6 from Pavel S. <pav_s at freenet.de>  2010-02-01 06:03:55
PST ---
Created an attachment (id=32969)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32969)
acpidump

I screwed my BIOS configuration with VT-d (and did no notice it), so the fist
dump was probably no the right one...


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Pavel S. <pav_s at freenet.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #32966|0                           |1
        is obsolete|                            |




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--- Comment #7 from Matthew Garrett <mjg59 at srcf.ucam.org>  2010-02-01
15:30:56 PST ---
Created an attachment (id=32984)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32984)
Fix nouveau state detection

Can you try this patch?


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--- Comment #8 from Pavel S. <pav_s at freenet.de>  2010-02-04 14:26:48
PST ---
(In reply to comment #7)
> Created an attachment (id=32984)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32984)
[details]
> Fix nouveau state detection
> 
> Can you try this patch?
> 
I tested it on 2.6.33-rc6 and it worked for me, thanks!
(should I test it on git too?)


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--- Comment #9 from Matthew Garrett <mjg59 at srcf.ucam.org>  2010-02-04
14:29:01 PST ---
No, that should be fine. I'll test it on the machine I have here and then
send
it upstream.


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--- Comment #10 from Pavel S. <pav_s at freenet.de>  2010-02-09 01:57:24
PST ---
(In reply to comment #9)
> No, that should be fine. I'll test it on the machine I have here and
then send
> it upstream.
> 
I have some news, which prove some assumptions about T410:
although there is that Intel GPU on the CPU, it is not activated, and cannot be
used in any way (AFAIK it is not connected to the mainboard so it cannot output
anything). This means that this Thinkpad does not have hybrid graphics.


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Ben Skeggs <skeggsb at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED




--- Comment #11 from Ben Skeggs <skeggsb at gmail.com>  2010-02-09
20:12:09 PST ---
I've also tested this on T410, and after talking to Matthew, committed the
fix.


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