[Bug 66942] New: Cayman HD 6950 hangs at start when loading kernel 3.11.0-rc1 or drm-next

[Bug 66942] New: Cayman HD 6950 hangs at start when loading kernel 3.11.0-rc1 or drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=66942

          Priority: medium
            Bug ID: 66942
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Cayman HD 6950 hangs at start when loading kernel
                    3.11.0-rc1 or drm-next
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: alexandre.f.demers@gmail.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

I just compiled and tested kernel 3.11.0-rc1. It hangs and do nothing when
initializing (last thing displayed is "Loading initial ramdisk").

Setting radeon.dpm=1 or 0 gives the same result. 

Since I know I'm also experiencing this hang with last week drm-next branch,
I'll try to bisect and see where it leads us.

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https://bugs.freedesktop.org/show_bug.cgi?id=66942

--- Comment #1 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
As a side note, it could be related to bug 66940

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https://bugs.freedesktop.org/show_bug.cgi?id=66942

--- Comment #2 from Alex Deucher <agd5f@yahoo.com> ---
probably a duplicate of bug 66551.

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https://bugs.freedesktop.org/show_bug.cgi?id=66942

--- Comment #3 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #2)
> probably a duplicate of bug 66551.

Probably not, the bug happens prior to the commit identified in bug 66551. I'm
bisecting as we are talking.

I also noticed a small glitch that was not in kernel 3.9 but is present in 3.10
that I'll report in another bug.

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[Bug 66942] Cayman HD 6950 hangs at start when loading kernel 3.11.0-rc1 or drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=66942

--- Comment #4 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Here is the first bad commit, which is pretty large since it doesn't point what
was changed before. It could be about any commit before that that touches
Cayman.

69e0b57a91adca2e3eb56ed4db39ab90f3ae1043 is the first bad commit
commit 69e0b57a91adca2e3eb56ed4db39ab90f3ae1043
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Fri Apr 12 16:42:42 2013 -0400

    drm/radeon/kms: add dpm support for cayman (v5)

    This adds dpm support for cayman asics.  This includes:
    - clockgating
    - dynamic engine clock scaling
    - dynamic memory clock scaling
    - dynamic voltage scaling
    - dynamic pcie gen1/gen2 switching (requires additional acpi support)
    - power containment
    - shader power scaling

    Set radeon.dpm=1 to enable.

    v2: fold in tdp fix
    v3: fix indentation
    v4: fix 64 bit div
    v5: attempt to fix state enable

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Reviewed-by: Jerome Glisse <jglisse@redhat.com>

:040000 040000 aa90c4d442d7640629695b1dc48e0ef1b3958e20
fc06e4965a658e0600ab5b250ae135e9e8225ca4 M    drivers

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https://bugs.freedesktop.org/show_bug.cgi?id=66942

--- Comment #5 from Alex Deucher <agd5f@yahoo.com> ---
Sounds like you may be waiting for the firmware loader to timeout.  Make sure
you have the new cayman smc ucode installed:
http://people.freedesktop.org/~agd5f/radeon_ucode/CAYMAN_smc.bin

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[Bug 66942] Cayman HD 6950 hangs at start when loading kernel 3.11.0-rc1 or drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=66942

--- Comment #6 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #5)
> Sounds like you may be waiting for the firmware loader to timeout.  Make
> sure you have the new cayman smc ucode installed:
> http://people.freedesktop.org/~agd5f/radeon_ucode/CAYMAN_smc.bin

Yes, it was missing. I'll test kernel 3.11-rc1 with it and with bug 66551's
patch.

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[Bug 66942] Cayman HD 6950 hangs at start when loading kernel 3.11.0-rc1 or drm-next

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--- Comment #7 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
I may be doing something wrong, but even with the firmware in the same folder
as the others (/usr/lib/firmware/radeon) and 66551's patch, it still hangs at
the same place.

Here is the content of that folder.
/usr/lib/firmware/radeon$ ls -l CAYMAN*
-rw-r--r-- 1 root root 24148 May 29 20:22 CAYMAN_mc.bin
-rw-r--r-- 1 root root  8704 May 29 20:22 CAYMAN_me.bin
-rw-r--r-- 1 root root  8704 May 29 20:22 CAYMAN_pfp.bin
-rw-r--r-- 1 root root  4096 May 29 20:22 CAYMAN_rlc.bin
-rw-r--r-- 1 root root 31212 Jul 16 21:10 CAYMAN_smc.bin

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--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
Did you re-generate the initrd after installing the missing firmware?

If the problem is the missing firmware, it should continue booting after three
minutes or so. Have you waited that long?

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--- Comment #9 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #8)
> Did you re-generate the initrd after installing the missing firmware?
> 
> If the problem is the missing firmware, it should continue booting after
> three minutes or so. Have you waited that long?

Yes. And just to be sure, I rebuilt the kernel tonight and reinstalled it (with
a new generated initramfs). I also decompressed the initramfs file and had a
look if the firmware had been packaged. There it was.

Also, it never timed out, it sat there for ever (I took time to have dinner).

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[Bug 66942] Cayman HD 6950 hangs at start when loading kernel 3.11.0-rc1 or drm-next

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Alexandre Demers <alexandre.f.demers@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=66963

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--- Comment #10 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Tested with today's kernel from Linus' git. Still the same. I built the radeon
driver in the kernel instead of building it as a module. No change.

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--- Comment #11 from Alex Deucher <agd5f@yahoo.com> ---
Does it boot correctly if you build radeon as a module, then disable radeon
(add radeon.modeset=0 to your kernel command line in grub) and boot to a non-X
runlevel, then load radeon manually?

modprobe -r radeon
modprobe radeon modeset=1

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--- Comment #12 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #11)
> Does it boot correctly if you build radeon as a module, then disable radeon
> (add radeon.modeset=0 to your kernel command line in grub) and boot to a
> non-X runlevel, then load radeon manually?
> 
> modprobe -r radeon
> modprobe radeon modeset=1

No, sadly, it still hangs at the same place. Problem is, I can't tell if it
hangs when loading the initramfs or when it tries to initialize the display
beyond that...

Any other suggestion? By the way, I built an 3.11.0-rc2 kernel this morning
with as few drivers as possible for my system, just in case, but without any
luck.

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Harald Judt <h.judt@gmx.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |h.judt@gmx.at

--- Comment #13 from Harald Judt <h.judt@gmx.at> ---
Same/similar problem here, with firmware built into the kernel (vanilla
3.11.0-rc2). With nomodeset the system boots, without it it doesn't.

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--- Comment #14 from Harald Judt <h.judt@gmx.at> ---
Please ignore my post, it was a kernel configuration problem. Got confused by
the many tests and used a wrong config... DPM works fine now, but radeon ring 5
problem with GPU stall after resuming from hibernation still exists in
3.11-rc2. Maybe some patches haven't made it into git yet, so I'll look for
them.

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--- Comment #15 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #14)
> Please ignore my post, it was a kernel configuration problem. Got confused
> by the many tests and used a wrong config... DPM works fine now, but radeon
> ring 5 problem with GPU stall after resuming from hibernation still exists
> in 3.11-rc2. Maybe some patches haven't made it into git yet, so I'll look
> for them.

What was the error in your kernel config?

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--- Comment #16 from Harald Judt <h.judt@gmx.at> ---
Sorry, I think I have to disappoint you, I don't think it will help with your
problem; I got the wrong config without the CAYMAN_smc.bin, and it hang for a
minute or so. After adding it, all worked fine (except for the issue with
hibernate/resume).

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--- Comment #17 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Alex, is there a chance for me to reverse some commits prior to 69e0b57 to find
which one or which feature is hanging my computer? Any approach I should try?

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--- Comment #18 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #17)
> Alex, is there a chance for me to reverse some commits prior to 69e0b57 to
> find which one or which feature is hanging my computer? Any approach I
> should try?

I'm not really sure what would have broken your system.  I also don't really
see how 69e0b57 could have broken anything since nothing changes with that as
long as dpm is disabled.  Do you still have the issue if you reset your tree to
the commit prior to 69e0b57?  Do you still get hangs if you disable radeon
(e.g., add radeon.modeset=0 to your kernel command line in grub)?

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--- Comment #19 from Alex Deucher <agd5f@yahoo.com> ---
Does booting a recent 3.11rc kernel with radeon.aspm=0 help?

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--- Comment #20 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #19)
> Does booting a recent 3.11rc kernel with radeon.aspm=0 help?

No, still hangs at the same point.

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--- Comment #21 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #18)
> (In reply to comment #17)
> > Alex, is there a chance for me to reverse some commits prior to 69e0b57 to
> > find which one or which feature is hanging my computer? Any approach I
> > should try?
> 
> I'm not really sure what would have broken your system.  I also don't really
> see how 69e0b57 could have broken anything since nothing changes with that
> as long as dpm is disabled.  Do you still have the issue if you reset your
> tree to the commit prior to 69e0b57?  Do you still get hangs if you disable
> radeon (e.g., add radeon.modeset=0 to your kernel command line in grub)?

I'll have to test when I'll get home, but I rebuilt a rc3 yesterday night and I
made sure to make it clean. I'll see if this helps. I'll also go back just
prior to 69e0b57 if it doesn't help. Finally, I'll play with the init and
disable some options just in case. Who knows what might help.

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Alexandre Demers <alexandre.f.demers@gmail.com> changed:

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

--- Comment #22 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #18)
> (In reply to comment #17)
> > Alex, is there a chance for me to reverse some commits prior to 69e0b57 to
> > find which one or which feature is hanging my computer? Any approach I
> > should try?
> 
> I'm not really sure what would have broken your system.  I also don't really
> see how 69e0b57 could have broken anything since nothing changes with that
> as long as dpm is disabled.  Do you still have the issue if you reset your
> tree to the commit prior to 69e0b57?  Do you still get hangs if you disable
> radeon (e.g., add radeon.modeset=0 to your kernel command line in grub)?

Good new, if I can say. I cleaned my build tree, updated my packages (one was
about gcc), redownloaded the firmware and recompiled 69e0b57: it now boots with
and without radeon.dpm=1. So, I'm closing this bug. One of those things must
have been the culprit.

I just have to test with rc3 now and hope for the best.

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