[Bug 16376] New: random - possibly Radeon DRM KMS related - freezes

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=16376

           Summary: random - possibly Radeon DRM KMS related - freezes
           Product: Drivers
           Version: 2.5
          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: Martin@Lichtvoll.de
        Regression: Yes


Affected kernel versions:
- 2.6.34-tp42-toi-3.1-04981-gb9a071a
- 2.6.34.1-tp42-toi-3.1.1.1-04990-g3a7d1f4

Last kernel that worked:
- 2.6.33.2-tp42-toi-3.1-lowmem-free-991-992-04964-gf00c7ec-dirty (including
some patches to explicitely allow freeing lowmem pages on hibernation - I
tested them for Nigel)

Currently running kernel:
- 2.6.33.6-tp42-toi-3.1.1.1-04982-g768d8a0

All from Nigel Cunnigham's TuxOnIce trees, but hangs happened before any
hibernation cycle took place.

So now I just report this although I do not have much information about the
circumstances of these hangs.

With 2.6.34 I had two and with 2.6.34.1 I had one sudden freeze of at least the
desktop on my ThinkPad T42 with Radeon graphics. Mouse pointer just froze,
Ctrl-Alt-F1 did nothing and AFAIR also there was no disk I/O anymore. I am not
completely sure about the last one. Since the freezes happened in quite
unpleasant circumstances I did not bother to start up a second machine in order
to try to SSH into my T42. With 2.6.33.2 I did not experience those freezes.

I used the tuxonice-2.6.34 tree from Nigel Cunningham, cause I prefer TuxOnIce
over other hibernation methods. Since all of the freezes just happened after a
fresh boot of the system without any snapshot cycle in between them, I believe
this to be a mainline kernel bug.

All freezes have been while running a KDE 4.4.4 desktop with OpenGL compositing
enabled. The first two times just shortly after login in to the desktop. The
third time while playing an AVI file from my photo SD card with Dragon Player.
On the other hand I had hours of uptime with some TuxOnIce snapshot cycles
without anything happening. I never had a freeze after the machine had done
snapshot cycle. The freezes rather happened shortly after a fresh boot of the
machine.

I am not sure whether this is a Radeon DRM KMS related bug, but this is my best
guess at the moment. Other activities involved in all three situations were:

- USB. On the first two a M-Audio Sonica Theater was connected. On the third
the kernel was reading the AVI file from a SD card connected via USB card
reader.

- eSATA harddisk. In all times an external 500 GB harddisk was connected via
eSATA

But also here I had the kernel running for hours with USB or eSATA without
anything happening.

In the further cause I will attach some hardware and software details that
might be helpful.

Currently I just downgraded to 2.6.33 again. I compiled me a 2.6.33.6. Since
actually I really want some stability at least during the week where I hold a
Linux training, I want to stick with it for now. Currently my plans are to wait
for 2.6.34.2 or .3 and try again. The laptop is used for production work and I
want it to meet some basic stability requirements. But if need be and I manage
to take time for it, I may do some guided testing.

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