[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

            Bug ID: 93753
           Summary: Sometimes wrong clk frequency of Display after dpms
                    mode changes.
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: t.graziadei@bachmann.info

Created attachment 121103
  --> https://bugs.freedesktop.org/attachment.cgi?id=121103&action=edit
Screenshot of failure

Sometimes after the deactivation of the screensaver or also on bootup the
screen shows flickering noise and a duplicated screen image. (Attached there is
the used test image and a screenshot of the failure image). 

We tested on various kernel versions, latest kernel tested was 4.4.0. We run a
customized debian image. 

Further investigations showed, that in the failure scenario the measured clk
frequency was only 25MHz but it should be 35MHz. 

We also tried to deactivate dpms completly (radeon.dpm=0 in kernel parameters)
and also turned the dpms off in the screensaver, but we still sometimes
encounter the problem after a reboot. 

Attached you will find a dmesg output with drm.debug=0xf activated. 

We use a Radeon PALM on a AMD G-T40E 2x1GHz

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

--- Comment #1 from t.graziadei@bachmann.info ---
Created attachment 121104
  --> https://bugs.freedesktop.org/attachment.cgi?id=121104&action=edit
original test image

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

--- Comment #2 from t.graziadei@bachmann.info ---
Created attachment 121105
  --> https://bugs.freedesktop.org/attachment.cgi?id=121105&action=edit
dmesg output of startup in case of failure

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

t.graziadei@bachmann.info changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #121103|0                           |1
        is obsolete|                            |

--- Comment #3 from t.graziadei@bachmann.info ---
Created attachment 121106
  --> https://bugs.freedesktop.org/attachment.cgi?id=121106&action=edit
Screenshot of failure

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

t.graziadei@bachmann.info changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #121104|0                           |1
        is obsolete|                            |

--- Comment #4 from t.graziadei@bachmann.info ---
Created attachment 121107
  --> https://bugs.freedesktop.org/attachment.cgi?id=121107&action=edit
original test image

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

t.graziadei@bachmann.info changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|medium                      |high
           Severity|major                       |critical

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #121103|text/plain                  |image/jpg
          mime type|                            |

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 415 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=93753

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #121104|text/plain                  |image/jpg
          mime type|                            |

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
What mode are you trying to set?  Please attach your xorg log and and config
(if you have one) and the xrandr --verbose output.

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

--- Comment #6 from Alex Deucher <alexdeucher@gmail.com> ---
DPM has nothing to do with the display clocks or dpms.  It's engine clock
management.  Also which display are you having problems with, VGA or LVDS?

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[Bug 93753] Sometimes wrong clk frequency of Display after dpms mode changes.

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https://bugs.freedesktop.org/show_bug.cgi?id=93753

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

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

--- Comment #7 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/678.

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