[Bug 73067] New: RV770 - screen flicker with radeon.dpm=1

[Bug 73067] New: RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

          Priority: medium
            Bug ID: 73067
          Assignee: dri-devel@lists.freedesktop.org
           Summary: RV770 - screen flicker with radeon.dpm=1
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: vasquinhos13@sapo.pt
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 91222
  --> https://bugs.freedesktop.org/attachment.cgi?id=91222&action=edit
lspci -vv

linux-sabayon-3.12.5
https://github.com/Sabayon/kernel
I installed the lastest available kernel version on sabayon-weekly repository.
sha1sum /lib/firmware/radeon/RV770_smc.bin
43e2fc7b9faa57e78401e1b1c609f71374cc8109  /lib/firmware/radeon/RV770_smc.bin

Whem booted with radeon.dpm=1 as a kernel parameter on grub, screen flicks:
jumps down some pixels and go to normal position every ~4 seconds very fast.
Whem /sys/class/drm/card0/device/power_dpm_force_performance_level is changed
to "high" or "low" flicker stops. Whem is changed back to "auto" flicker
happens again, no mather what value is power_dpm_state.

Whem booted without radeon.dpm=1 parameter there isn't flicker.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #1 from Vasco Almeida <vasquinhos13@sapo.pt> ---
Created attachment 91223
  --> https://bugs.freedesktop.org/attachment.cgi?id=91223&action=edit
dmesg output

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #2 from Vasco Almeida <vasquinhos13@sapo.pt> ---
Created attachment 91224
  --> https://bugs.freedesktop.org/attachment.cgi?id=91224&action=edit
glxinfo

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #3 from Alex Deucher <agd5f@yahoo.com> ---
Please attach your xorg log and the output of xrandr --verbose.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #4 from Alex Deucher <agd5f@yahoo.com> ---
Created attachment 91227
  --> https://bugs.freedesktop.org/attachment.cgi?id=91227&action=edit
debugging patch

Please attach your dmesg output with the attached patch applied to your kernel.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #5 from Vasco Almeida <vasquinhos13@sapo.pt> ---
Created attachment 91232
  --> https://bugs.freedesktop.org/attachment.cgi?id=91232&action=edit
xrandr --verbose

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #6 from Vasco Almeida <vasquinhos13@sapo.pt> ---
Created attachment 91233
  --> https://bugs.freedesktop.org/attachment.cgi?id=91233&action=edit
Xorg.log

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #7 from Vasco Almeida <vasquinhos13@sapo.pt> ---
Created attachment 91254
  --> https://bugs.freedesktop.org/attachment.cgi?id=91254&action=edit
dmesg with patch

This is dmesg outpout with the patch attached above.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #8 from Alex Deucher <agd5f@yahoo.com> ---
Created attachment 91611
  --> https://bugs.freedesktop.org/attachment.cgi?id=91611&action=edit
add quirk

Does the attached patch fix the issue?

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #9 from Vasco Almeida <vasquinhos13@sapo.pt> ---
Yes, the attached patch fixed the flicker. Screen does not flick whichever
value is power_dpm_state or power_dpm_force_performance_level.

Before the patch, the flicker happened when switching from
power level 2    sclk: 66500 mclk: 95000 vddc: 1082
to
power level 1    sclk: 50000 mclk: 70000 vddc: 1046

In the way level 1 -> level 2 there is not screen flicker.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #10 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #9)
> Yes, the attached patch fixed the flicker. Screen does not flick whichever
> value is power_dpm_state or power_dpm_force_performance_level.
> 
> Before the patch, the flicker happened when switching from
> power level 2    sclk: 66500 mclk: 95000 vddc: 1082
> to
> power level 1    sclk: 50000 mclk: 70000 vddc: 1046
> 
> In the way level 1 -> level 2 there is not screen flicker.

The flicker is caused by the mclk transition.  It some cases it seems to take
longer than the vblank period which is why you are seeing the flicker.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #11 from Vasco Almeida <vasquinhos13@sapo.pt> ---
I found that my screen was flicking once in ~4 seconds because of conky. With
conky off, flicks happen but happen a lot less, like 1 in ~20 - this period
depends on what I'm doing. But testing with glxspheres, screen flicker happens
each ~4 seconds again. Probably this isn't important.

Can you give some hints about the solution? Do you think this can be fixed? Or
this driver won't support mclk transition on this board?

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #12 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #11)
> I found that my screen was flicking once in ~4 seconds because of conky.
> With conky off, flicks happen but happen a lot less, like 1 in ~20 - this
> period depends on what I'm doing. But testing with glxspheres, screen
> flicker happens each ~4 seconds again. Probably this isn't important.
> 

It happens whenever there is an mclk transition based on GPU load.

> Can you give some hints about the solution? Do you think this can be fixed?
> Or this driver won't support mclk transition on this board?

I'm not sure how reliable mclk switching was on rv770 boards in general.  Most
rv770 boards I've seen have the same mclk for all performance levels.  You
might try adjusting the value of CG_DISPLAY_GAP_CNTL in
rv770_program_display_gap().  Maybe try R600_PM_DISPLAY_GAP_VBLANK_OR_WM or
R600_PM_DISPLAY_GAP_WATERMARK rather than R600_PM_DISPLAY_GAP_VBLANK for
DISP1_GAP_MCHG, but I don't think it will make a difference.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #13 from Benjamin Bellec <b.bellec@gmail.com> ---
Alex, I saw you disabled RV770 mclk switching to kernel 3.13.3 and 3.12.11.
Thank you, it's now much more comfortable (tested with Fedora 19 kernel
3.12.11).

Anyway, do you plan to add your patch to kernel 3.10 too? It's a long-term
release and will be used by RHEL7.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

--- Comment #14 from Benjamin Bellec <b.bellec@gmail.com> ---
(In reply to comment #13)
> Anyway, do you plan to add your patch to kernel 3.10 too? It's a long-term
> release and will be used by RHEL7.

Shame on me. DPM landed in kernel 3.11.

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[Bug 73067] RV770 - screen flicker with radeon.dpm=1

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https://bugs.freedesktop.org/show_bug.cgi?id=73067

Alex Deucher <agd5f@yahoo.com> changed:

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

--- Comment #15 from Alex Deucher <agd5f@yahoo.com> ---
Fixed in:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8097d94116d0c17e774ba4c8256e774018dc2a46

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