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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
          Reporter: t.graziadei at 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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