[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

            Bug ID: 93911
           Summary: Radeon rv635 with KMS and no dpm, intermittent/random
                    GPU lockup
           Product: Mesa
           Version: 11.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: dabreese00@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

I am running Slackware Linux on my laptop with ATI/AMD Mobility Radeon HD 3670.
 I have a recurring crash/lockup that happens intermittently while running X:
my screen will spontaneously freeze for a few seconds, then the screen goes
blank black or white, or slowly change colors, for a few seconds, during which
it's still frozen (mouse/keyboard input has no effect, even CTRL-ALT-F1 or
CTRL-ALT-BACKSPACE).  Afterwards it returns me to a distorted/garbled version
of my desktop, and I can switch to a virtual terminal and kill X or reboot. 
Sometimes instead -- rarely -- the system recovers successfully and I am
returned to a fully functional X desktop after the lockup.  I have saved dmesg
from both versions of the crash.

I haven't figured out a way to trigger it.  The only common thread I've noticed
is it seems to only happen when the system is under some kind of load, and is
updating the display.  But it happens fairly regularly, something like once a
week.

I have tried adjusting some X radeon settings (man radeon), and some kernel
radeon settings (modinfo radeon).  After I added dpm=0 to radeon module
parameters, the crash behavior became more simple and consistent (now it's
almost always a slow fade to white followed by a glitched desktop screen) and
showed closer to a full recovery.  Nothing I've tried has stopped the lockup
from occurring entirely, except disabling kernel modesetting (which leaves me
with poor resolution options).

root@Dell-XPS:~# uname -a
Linux Dell-XPS 4.1.15 #2 SMP Tue Dec 15 21:00:31 CST 2015 x86_64 Intel(R)
Core(TM)2 Duo CPU     P8600  @ 2.40GHz GenuineIntel GNU/Linux

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

--- Comment #1 from David Breese <dabreese00@gmail.com> ---
Created attachment 121365
  --> https://bugs.freedesktop.org/attachment.cgi?id=121365&action=edit
dmesg (after recovery failed)

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 318 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=93911

--- Comment #2 from David Breese <dabreese00@gmail.com> ---
Created attachment 121366
  --> https://bugs.freedesktop.org/attachment.cgi?id=121366&action=edit
dmesg (after recovery succeeded)

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

--- Comment #3 from David Breese <dabreese00@gmail.com> ---
Created attachment 121367
  --> https://bugs.freedesktop.org/attachment.cgi?id=121367&action=edit
/etc/X11/xorg.conf.d/radeon.conf

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 313 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=93911

--- Comment #4 from David Breese <dabreese00@gmail.com> ---
Created attachment 121368
  --> https://bugs.freedesktop.org/attachment.cgi?id=121368&action=edit
/etc/modprobe.d/radeon.conf

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

--- Comment #5 from David Breese <dabreese00@gmail.com> ---
Created attachment 121369
  --> https://bugs.freedesktop.org/attachment.cgi?id=121369&action=edit
/proc/cmdline

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 450 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=93911

--- Comment #6 from David Breese <dabreese00@gmail.com> ---
Created attachment 121370
  --> https://bugs.freedesktop.org/attachment.cgi?id=121370&action=edit
Versions of software currently installed

The attached dmesg (after successful recovery) is from a month or two ago, some
software versions were not quite the same.

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #7 from Michel Dänzer <michel@daenzer.net> ---
Probably a duplicate of bug 91268, please try a newer kernel or the fix
referenced there.

*** This bug has been marked as a duplicate of bug 91268 ***

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

--- Comment #8 from David Breese <dabreese00@gmail.com> ---
Thank you very much for pointing me to that, it looks right.  I didn't manage
to find it when searching the bug tracker.

I've now upgraded to kernel 4.4 which contains the relevant commit.  No more
crashes so far after 3 days of heavy use -- normally I would have expected a
crash sometime.

I'll post back if I do see the crash again, but provisionally I'll say this did
the trick.

Thanks!

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

David Breese <dabreese00@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|DUPLICATE                   |---

--- Comment #9 from David Breese <dabreese00@gmail.com> ---
This did not fix the issue.  Still present in kernel 4.4 and 4.4.1, both of
which I believe contain the relevant commit mentioned in bug 91268.

No idea what this means or if it will be any use, but I notice that running
without "iommu=soft" on the kernel command line, suddenly the bug starts
occurring more than once an hour.  I have been running with "iommu=soft", in
which case the bug seems to happen more like once every 20 hours of X11 use.

Otherwise, mostly still the same package versions and dmesg as posted above,
but I can post the precise new info if desired.  Let me know what info I can
provide that would be useful.

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[Bug 93911] Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93911

David Breese <dabreese00@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #10 from David Breese <dabreese00@gmail.com> ---
Seems to be fixed by either 4.4.2 or 4.4.3.  I haven't experienced the issue in
a month now since upgrading from 4.4.1.  I can only assume this was indeed a
duplicate of bug 91268 as Michel guessed, and I was somehow wrong in thinking
that Slackware's 4.4 and 4.4.1 kernels contained the commit from that bug
(96ea47c0ec8c012509116bee8c57414281428fc4).

Thanks a bunch to the radeon devs for all your work.

David

*** This bug has been marked as a duplicate of bug 91268 ***

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