[Bug 29372] New: KMS - radeon (Uhhuh. NMI received for unknown reason)

[Bug 29372] New: KMS - radeon (Uhhuh. NMI received for unknown reason)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29372

           Summary: KMS - radeon (Uhhuh. NMI received for unknown reason)
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.37.x
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: tomasi@cli.di.unipi.it
                CC: alexdeucher@gmail.com
        Regression: No


I noticed that when I run:
  xset dpms force standby
or
  echo "low" > /sys/class/drm/card0/device/power_profile
for my ATI Radeon Mobile X1400 (I think r5xx) I receive this advise from
kernel:
---
  Uhhuh. NMI received for unknown reason a1 on CPU 0.
  You have some hardware problem, likely on the PCI bus.
  Dazed and confused, but trying to continue
---
or something like. With latest commit on master branch of xf86-video-ati:
   http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/
my PC go on freeze after some stanby. Now I'm using the xf86-video-ati at
latest commit at 2011-02-15 16:24:23 (4d7e1498f7d9eb50e2eddabca193fc27bde24f0e)

Best regards,
Emanuele

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[Bug 29372] KMS - radeon (Uhhuh. NMI received for unknown reason)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29372





--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2011-02-18 16:50:38 ---
This sounds like two different issues that should be filed separately.

1. The NMI when changing the pcie lanes

2. Problems with the latest ddx.


For 1., that is due to changing the number of PCIE lanes.  I'm not sure how to
avoid it. Tt should be ok as the GPU is idle and all buffers are unmapped when
we changes the lanes.  You can disable the PCIE lane changes by removing the
call to radeon_set_pcie_lanes() in rs600_pm_misc() in rs600.c.

For 2., Are you saying 4d7e1498f7d9eb50e2eddabca193fc27bde24f0e is the last
working commit or the last commit you tried.  What version were you previously
using that did not cause a problem?  Can you bisect?  Are you sure it's a ddx
issue and not a drm issue (i.e., does using an older ddx on the same kernel
work ok)?

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[Bug 29372] KMS - radeon (Uhhuh. NMI received for unknown reason)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29372


Emanuele Tomasi <tomasi@cli.di.unipi.it> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Platform|All                         |x86-64




--- Comment #2 from Emanuele Tomasi <tomasi@cli.di.unipi.it>  2011-02-18 22:17:46 ---
Hi Alex,
I made new tests. With 2.6.37 I receive the message 'Uhhuh' from kernel on
standby and the PC freezes with the commit
d7c2ba4286ea32401c0026cb92ec167f7b5753d8. (With
4d7e1498f7d9eb50e2eddabca193fc27bde24f0e I haven't freezing).
With 2.6.37.1 I keep getting 'Uhhuh' message but I'm not having freezing, even
with d7c2ba4286ea32401c0026cb92ec167f7b5753d8.
If I disable the PCIE lane changes as you suggested, also the message 'Uhhuh'
goes away.

So, wath do you think about? Do you need additional infos or tests?

Best regards,
Emanuele

P.S. I'm on x86_64

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[Bug 29372] KMS - radeon (Uhhuh. NMI received for unknown reason)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29372


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|                            |OBSOLETE




--- Comment #3 from Alan <alan@lxorguk.ukuu.org.uk>  2012-08-16 11:00:21 ---
If this is still seen with a modern (3.2 etc) kernel please updare/re-open
thanks

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