[Bug 101593] Display errors with a R9 290x and a resolution of 3840x2160

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101593

            Bug ID: 101593
           Summary: Display errors with a R9 290x and a resolution of
                    3840x2160
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: tardingens at googlemail.com

Using the radeon driver with an AMD R9 290x and a 4k monitor causes display
corruption when set to the native resolution.

The problem was introduced with this change:
drm/radeon: change vblank_times calculation method to reduce computational
error.
https://patchwork.kernel.org/patch/9403897/

The issue is very easy to see when the mclk speed is forced to low, but it
occurs in normal usage too. Before the patch mclk switching was disabled at 4k
and the bug was not there.

The Windows driver has no such problems and does fine, even with mclk
switching.

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