[Bug 43655] New: Latest radeon dri driver on HD6950 with kernel 3.2 flickers

[Bug 43655] New: Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

             Bug #: 43655
           Summary: Latest radeon dri driver on HD6950 with kernel 3.2
                    flickers
    Classification: Unclassified
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: alexandre.f.demers@gmail.com


My new HD6950 flickers like hell right from the initialization. Using kernel
3.1.0 is just fine, but kernels 3.2.0-rc3 and over make the screen flicker (I
can't tell for versions in between for now). Also, the screen seems shifted by
a bit more than half my monitor's width.

I also have an integrated HD3200 and I have no problem at all when selecting
this integrated chipset over my PCI-E 6950 with the same driver and kernel
combinations.

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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--- Comment #1 from Alex Deucher <agd5f@yahoo.com> 2011-12-09 06:00:10 PST ---
Can you bisect?  Did you update any other components (mesa, xf86-video-ati) or
just the kernel?

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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--- Comment #2 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-11 09:00:57 UTC ---
More info about this bug: I have both kernel 3.1.0 and 3.2.0-rc4 installed
right now (compiled from kernel.org). I had 3.2.0-rc3 installed, before moving
to rc4 to test if the bug had been solved.

Have I updated other components? Of course, I'm testing with latest versions of
both mesa and xf86-video-ati (I'll have to test today's versions though). But
then, it shouldn't be a problem since I'm testing the same components with both
kernels.

I'll bisect kernel's commits in the next couple of days to find which one is
breaking things.

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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--- Comment #3 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-12 01:03:23 PST ---
OK, so after testing first all RCs, I narrowed the problem between RC3 and RC4.
So, bisecting gave me the following culprit:

commit 9b5a4d4f65e260a109eaeea8bbc8062a7c58b55e
Merge: cb35999 67589c7
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon Nov 28 13:49:43 2011 -0800

    Merge branch 'for-3.2-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/gi

    * 'for-3.2-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
      percpu: explain why per_cpu_ptr_to_phys() is more complicated than
necessa
      percpu: fix chunk range calculation
      percpu: rename pcpu_mem_alloc to pcpu_mem_zalloc

It has nothing to do with drm in itself. But it must be related at some
point... I'll reset my tree tomorrow and retest to be sure by compiling just
before this commit.

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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--- Comment #4 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-13 17:48:47 PST ---
Strangely, when rebisecting, I found commit
a34815b96f9a21b3a2e2912dfd0d994acd2855e3 to be the bad one... It is really near
to the first one. So, I'm retesting both to be sure.

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--- Comment #5 from Michel Dänzer <michel@daenzer.net> 2011-12-15 10:18:01 UTC ---
It sounds like the problem may happen or not with a certain probability with
any given kernel. You should probably test each kernel a certain number of
times before declaring it as good, or the bisection may not work correctly.

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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

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

--- Comment #6 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-15 14:03:15 PST ---
I tested today's latest kernel version after fighting with the beast for the
last couple of days. Just to be sure, I made a clean compilation and it now
works properly without any problem. I'll assume for the moment it was related
to something stuck in the compilation.

If anything goes wrong again, I'll reopen the bug.

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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

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

--- Comment #7 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-15 16:31:19 PST ---
This is one driving me crazy. You were right, it is no reproducible everytime.
I have to reboot a couple of time to trigger it or to fix it... Going back to
bisection.

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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--- Comment #8 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-15 17:50:38 PST ---
I think I've found a hint. Here's the thing:

Whatever kernel version is the first entry in my Grub's list, the problem will
appear. If I select a different kernel manually or if I change the default menu
entry to a different one, everything is fine. The only exception is if my first
menu entry is Windows. Then, there is never any problem.

Here is what I see when selecting the first entry. First, the Grub's background
stays for a moment and then it switches to the boot screen (using Ubuntu, it
shows the Ubuntu loading screen). However, most of the time, it will flicker,
usually showing only a couple of clear lines at the top of the screen.

If I select another entry, it switches to the kernel initialization (showing
step by step what is being done) and then it switches to the boot screen only
after having initialized correctly the screen. The only difference I can see
between the first entries and the others is the following in my grub.cfg:
    set gfxpayload=$linux_gfx_mode

I suspect a bad interaction between Grub and the rest of the initialization
process. Does my suspicion make sense?

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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--- Comment #9 from Michel Dänzer <michel@daenzer.net> 2011-12-16 01:38:38 PST ---
(In reply to comment #8)
> I suspect a bad interaction between Grub and the rest of the initialization
> process. Does my suspicion make sense?

Quite possibly. Can you test your hypothesis by moving this line between
entries?

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[Bug 43655] Latest radeon dri driver on HD6950 with kernel 3.2 flickers

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--- Comment #10 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-16 06:51:47 PST ---
(In reply to comment #9)
> (In reply to comment #8)
> > I suspect a bad interaction between Grub and the rest of the initialization
> > process. Does my suspicion make sense?
> 
> Quite possibly. Can you test your hypothesis by moving this line between
> entries?

Tested and confirmed. Whenever I added "set gfxpayload=$linux_gfx_mode", there
was a really high chance of hitting this bug (near 90% of the time). Without
it, I booted flawlessly.

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set gfxpayload=$linux_gfx_mode put the display in a flickering state

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Latest radeon dri driver on |Latest radeon dri driver on
                   |HD6950 with kernel 3.2      |HD6950 with GRUB set
                   |flickers                    |gfxpayload=$linux_gfx_mode
                   |                            |put the display in a
                   |                            |flickering state

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--- Comment #11 from Alexandre Demers <alexandre.f.demers@gmail.com> 2011-12-17 10:23:06 PST ---
Should I try to bisect drm driver to see if there is a version without that
problem? I've had this new 6950 for less than 2 weeks, so I don't even know if
it worked correctly at some point.

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set gfxpayload=$linux_gfx_mode put the display in a flickering state

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Peter Wang <blinxwang@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |blinxwang@gmail.com

--- Comment #12 from Peter Wang <blinxwang@gmail.com> 2012-04-29 12:45:29 PDT ---
*** Bug 49262 has been marked as a duplicate of this bug. ***

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set gfxpayload=$linux_gfx_mode put the display in a flickering state

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--- Comment #13 from Alexandre Demers <alexandre.f.demers@gmail.com> 2012-07-21 03:49:15 PDT ---
It's been some time now. Since my initial report, I moved from Ubuntu to Arch.
Today, it was officially announced Arch was moving to Grub2. So I updated my
setup (I was using Grub legacy since my move to Arch). Suprise, this bug is
still valide.

So I played around with grub default options. So GRUB_GFXMODE=auto works fine,
but GRUB_GFXPAYLOAD_LINUX=keep triggers the bug. Removing the latest option
makes everything runs smoothly.

I read bug 49262 and two things are common with my setup: we are both using a
69XX radeon card and we are both using a DVI-to-VGA adaptor. I'm wondering if
the combination of card AND adaptor was the root of the problem. Before having
this 6950 card, I was using an Radeon HD 3200 IGP without any adaptor and I had
no problem.

I don't have any other monitor here and I don't have a DVI or HDMI input on my
monitor, so I can't tell yet. But still, what would you suggest to try to help
figure out what's going on? Any comment from Alex or Michel would be
appreciated. I could have access to a different monitor if I ask for it.

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set gfxpayload=$linux_gfx_mode put the display in a flickering state

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--- Comment #14 from Alexandre Demers <alexandre.f.demers@gmail.com> 2012-07-26 05:33:08 PDT ---
May well be the same as bug 42373. I'll try to find a way to dig this following
42373 repro steps.

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--- Comment #15 from Jerome Glisse <glisse@freedesktop.org> 2012-07-30 14:59:56 UTC ---
If it's same as https://bugs.freedesktop.org/show_bug.cgi?id=42373 then patch
there should fix your issue.

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--- Comment #16 from Alexandre Demers <alexandre.f.demers@gmail.com> 2012-07-30 15:12:24 UTC ---
(In reply to comment #15)
> If it's same as https://bugs.freedesktop.org/show_bug.cgi?id=42373 then patch
> there should fix your issue.

I'll try it as soon as I'll have time. Thank you Jerome for your follow-up.

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--- Comment #17 from Alexandre Demers <alexandre.f.demers@gmail.com> 2012-08-04 04:58:03 UTC ---
(In reply to comment #16)
> (In reply to comment #15)
> > If it's same as https://bugs.freedesktop.org/show_bug.cgi?id=42373 then patch
> > there should fix your issue.
> 
> I'll try it as soon as I'll have time. Thank you Jerome for your follow-up.

(In reply to comment #15)
> If it's same as https://bugs.freedesktop.org/show_bug.cgi?id=42373 then patch
> there should fix your issue.

It fixes it. Applied, rebooted 3 times without problem, went back to 3.6-rc1
(no patch) problem appeared, went back to patched kernel and still no problem.

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Alex Deucher <agd5f@yahoo.com> changed:

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

--- Comment #18 from Alex Deucher <agd5f@yahoo.com> 2012-08-04 13:26:36 UTC ---


*** This bug has been marked as a duplicate of bug 42373 ***

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--- Comment #19 from Alexandre Demers <alexandre.f.demers@gmail.com> 2012-08-20 03:00:22 UTC ---
Fixed by attachment 64759 (proposed in bug 42373 which is similar to this bug
but is not the same since it is not fixed by the attachment)

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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=56139

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

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

--- Comment #20 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
I'm reopening this bug for two reasons:
 -It is still happening with kernel 3.9.0-rc4 because attachment 64759 from bug
42373 seems to never have been pushed
 -It is not a duplicate of bug 42373 since attachment 64759 fixes current bug
but not 42373

It would be nice to have a revised version of attachment 64759 that applies
correctly on latest kernel, then to have it tested and pushed to kernel's git.

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--- Comment #21 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
So I'm trying to narrow down what is going on. Kernel 3.5 + patch 64759 works
OK. I'm now testing kernel's commit 81ee8fb6b52ec69eeed37fe7943446af1dccecc5
that was supposed to supersede patch 64759 in kernel 3.6. I'll see what I get.

My feeling is we are not saving/restoring an address (VM, VRAM, TTM, whatever)
correctly somewhere along the path.

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Latest radeon dri driver on |Latest radeon dri driver on
                   |HD6950 with GRUB set        |HD6950 with GRUB set
                   |gfxpayload=$linux_gfx_mode  |"GRUB_GFXPAYLOAD_LINUX=keep
                   |put the display in a        |" put the display in a
                   |flickering state            |flickering state

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--- Comment #22 from Alex Deucher <agd5f@yahoo.com> ---
The current code should do the right thing with respect to disabling display
access to vram when we reconfigure the memory controller.  The current code
disables memory reads but leaves the display controllers enabled while we
change the MC setup.  Turning off the crtcs as the patch you mentioned does has
two problems:
1. it breaks some systems which the current method fixes
2. it defeats the purpose of GRUB_GFXPAYLOAD_LINUX=keep which is to avoid
turning off the displays for flickerless boot up.  If you turn off the crtcs
you have to re-init the entire display pipeline.
The problem seems to be that disabling the crtc memory reads seems to take
longer than expected on some systems which leads to invalid reads while the MC
is being reprogrammed.  One possible solution may be to leave the MC as
configured by the vbios and try and put the gart aperture either before or
after the location of varm in the GPU's address space.

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--- Comment #23 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #22)
> The current code should do the right thing with respect to disabling display
> access to vram when we reconfigure the memory controller.  The current code
> disables memory reads but leaves the display controllers enabled while we
> change the MC setup.  Turning off the crtcs as the patch you mentioned does
> has two problems:
> 1. it breaks some systems which the current method fixes
> 2. it defeats the purpose of GRUB_GFXPAYLOAD_LINUX=keep which is to avoid
> turning off the displays for flickerless boot up.  If you turn off the crtcs
> you have to re-init the entire display pipeline.
> The problem seems to be that disabling the crtc memory reads seems to take
> longer than expected on some systems which leads to invalid reads while the
> MC is being reprogrammed.  One possible solution may be to leave the MC as
> configured by the vbios and try and put the gart aperture either before or
> after the location of varm in the GPU's address space.

I understand what you are explaining. Meanwhile, I'm bisecting to find out
where it was broken again since commit 81ee8fb6b52ec69eeed37fe7943446af1dccecc5
does indeed what it is supposed to do (no problem when using
GRUB_GFXPAYLOAD_LINUX=keep). So, somewhere between commit
81ee8fb6b52ec69eeed37fe7943446af1dccecc5 and 3.9.0-rcx, something went wrong.
I'll keep in touch.

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

--- Comment #24 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
62444b7462a2b98bc78d68736c03a7c4e66ba7e2 is the first bad commit
commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Wed Aug 15 17:18:42 2012 -0400

    drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)

    - Stop the displays from accessing the FB
    - Block CPU access
    - Turn off MC client access

    This should fix issues some users have seen, especially
    with UEFI, when changing the MC FB location that result
    in hangs or display corruption.

    v2: fix crtc enabled check noticed by Luca Tettamanti

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

:040000 040000 3e0d33c9b4eda29ced814fe9a863efe63e53f14c
4932561607b160734ec1eade927a9fe18c9f3f1b M    drivers




So in other words, your explanation Alex seems to be right. I'll be waiting if
anything has to be tested.

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

--- Comment #25 from Alex Deucher <agd5f@yahoo.com> ---
Created attachment 77332
  --> https://bugs.freedesktop.org/attachment.cgi?id=77332&action=edit
possible fix

Does this patch help?

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

--- Comment #26 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #25)
> Created attachment 77332 [details] [review]
> possible fix
> 
> Does this patch help?

Applied on 3.9-rc5 and it doesn't help.

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

--- Comment #27 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #26)
> Applied on 3.9-rc5 and it doesn't help.

Can you attach your dmesg output with the patch applied?

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

--- Comment #28 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Created attachment 77348
  --> https://bugs.freedesktop.org/attachment.cgi?id=77348&action=edit
dmesg from 3.9-rc5 with patch

Et voilà, as asked

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #77348|0                           |1
        is obsolete|                            |

--- Comment #29 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Created attachment 77350
  --> https://bugs.freedesktop.org/attachment.cgi?id=77350&action=edit
3.9-rc5 with patch and drm.debug=14

With more debug info

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=57567

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

--- Comment #30 from Alex Deucher <agd5f@yahoo.com> ---
does attachment 77441 help?

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

--- Comment #31 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
(In reply to comment #30)
> does attachment 77441 [details] [review] help?

Still the same. 1 boot on 4 was OK, the three others were showing the same kind
of corruptions as before.

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[Bug 43655] Latest radeon dri driver on HD6950 with GRUB set "GRUB_GFXPAYLOAD_LINUX=keep" put the display in a flickering state

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https://bugs.freedesktop.org/show_bug.cgi?id=43655

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

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

--- Comment #32 from Alexandre Demers <alexandre.f.demers@gmail.com> ---
Closing this bug since fixed since a few of releases.

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