[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

            Bug ID: 96326
           Summary: Heavy screen flickering in OpenGL apps on R9 390
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: 0xe2.0x9a.0x9b@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

GPU: R9 390
GPU manufacturer: Gigabyte
Kernel: 4.5, 4.6, etc
Firmware: both hawaii_smc.bin and hawaii_k_smc.bin

Hello,

I am experiencing heavy LCD screen flickering in OpenGL apps when automatic GPU
power management is enabled.

The flickering is related to mclk transitions. Forcing mclk=1.5GHz, and letting
sclk be controlled by DPM, removes the flickering.

Related issues:
http://bugs.freedesktop.org/show_bug.cgi?id=91880
http://bugs.freedesktop.org/show_bug.cgi?id=92302

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

Vedran Miletić <vedran@miletic.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vedran@miletic.net

--- Comment #1 from Vedran Miletić <vedran@miletic.net> ---
Confirmed by lilleman on #radeon:
https://people.freedesktop.org/~cbrill/dri-log/?channel=radeon&date=2016-06-17

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

--- Comment #2 from Jan Ziak <0xe2.0x9a.0x9b@gmail.com> ---
The flickering disappears after switching from X11 to Linux console
(Ctrl+Alt+F1) and back (Ctrl+Alt+F7). mclk transitions 150MHz <-> 1500MHz no
longer cause monitor flickering after that.

The code in the Linux kernel executed during the switch to Linux console and
back fixes the issue, we just need to pinpoint the code lines responsible for
the fix.

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         QA Contact|dri-devel@lists.freedesktop |
                   |.org                        |
            Product|Mesa                        |DRI
          Component|Drivers/Gallium/radeonsi    |DRM/Radeon
            Version|git                         |unspecified

--- Comment #3 from Alex Deucher <alexdeucher@gmail.com> ---
Please attach your xorg log and dmesg output.  What resolution and refresh rate
are you using on your monitor?  Also are you using radeon or amdgpu?

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

--- Comment #4 from Jan Ziak <0xe2.0x9a.0x9b@gmail.com> ---
Created attachment 125424
  --> https://bugs.freedesktop.org/attachment.cgi?id=125424&action=edit
dmesg (linux kernel git 2016-jul-29 with custom patches)

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

--- Comment #5 from Jan Ziak <0xe2.0x9a.0x9b@gmail.com> ---
Created attachment 125425
  --> https://bugs.freedesktop.org/attachment.cgi?id=125425&action=edit
Xorg.0.log (xorg-server-1.17.4, no custom patches)

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

--- Comment #6 from Jan Ziak <0xe2.0x9a.0x9b@gmail.com> ---
(In reply to Alex Deucher from comment #3)
> Please attach your xorg log and dmesg output.

Upstream Linux kernel does not support variable mclk on R9 390. I enabled
variable mclk by patching some code in drivers/gpu/drm/amd/amdgpu/ (mostly
ci_dpm.c).

dmesg output contains some logging messages I added to my copy of Linux kernel
source code.

> What resolution and refresh rate are you using on your monitor?

1920x1080 60Hz

> Also are you using radeon or amdgpu?

Currently amdgpu.ko, radeon.ko in the past.

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

--- Comment #7 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Jan Ziak from comment #6)
> (In reply to Alex Deucher from comment #3)
> > Please attach your xorg log and dmesg output.
> 
> Upstream Linux kernel does not support variable mclk on R9 390. I enabled
> variable mclk by patching some code in drivers/gpu/drm/amd/amdgpu/ (mostly
> ci_dpm.c).

What patch(es) did you use?

> 
> dmesg output contains some logging messages I added to my copy of Linux
> kernel source code.
> 
> > What resolution and refresh rate are you using on your monitor?
> 
> 1920x1080 60Hz
> 
> > Also are you using radeon or amdgpu?
> 
> Currently amdgpu.ko, radeon.ko in the past.

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

--- Comment #8 from Jan Ziak <0xe2.0x9a.0x9b@gmail.com> ---
(In reply to Alex Deucher from comment #7)
> (In reply to Jan Ziak from comment #6)
> > (In reply to Alex Deucher from comment #3)
> > > Please attach your xorg log and dmesg output.
> > 
> > Upstream Linux kernel does not support variable mclk on R9 390. I enabled
> > variable mclk by patching some code in drivers/gpu/drm/amd/amdgpu/ (mostly
> > ci_dpm.c).
> 
> What patch(es) did you use?

I added a function based on ci_dpm_force_state_mclk() in ci_dpm.c.

mask is 0x3.

----
static int ci_dpm_force_state_mclk_mask(struct amdgpu_device *adev, u32 mask) {
    struct ci_power_info *pi = ci_get_pi(adev);

    if (!pi->mclk_dpm_key_disabled) {
        PPSMC_Result smc_result =
amdgpu_ci_send_msg_to_smc_with_parameter(adev,
PPSMC_MSG_MCLKDPM_SetEnabledMask, mask);
            printk("[atomsymbol] %s:%d: mask=0x%X, ok=%d\n", __FUNCTION__,
__LINE__, mask, smc_result == PPSMC_Result_OK);
            if (smc_result != PPSMC_Result_OK)
                return -EINVAL;
    }
    return 0;
}
----

/sys/class/drm/card?/device/power_dpm_force_performance_level is set to "auto".

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[Bug 96326] Heavy screen flickering in OpenGL apps on R9 390

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https://bugs.freedesktop.org/show_bug.cgi?id=96326

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #9 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/720.

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