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@lists.freedesktop.org
Reporter: tarding...@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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