[Mesa-dev] [Bug 97260] R9 290 low performance in Linux 4.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97260

--- Comment #59 from Alex Deucher <alexdeucher at gmail.com> ---
does reverting either of these patches help?

commit 5e031d9fe8b0741f11d49667dfc3ebf5454121fd
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Wed Feb 24 17:38:38 2016 -0500

    drm/radeon/pm: update current crtc info after setting the powerstate

    On CI, we need to see if the number of crtcs changes to determine
    whether or not we need to upload the mclk table again.  In practice
    we don't currently upload the mclk table again after the initial load.
    The only reason you would would be to add new states, e.g., for
    arbitrary mclk setting which is not currently supported.

    Acked-by: Christian König <christian.koenig at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
    Cc: stable at vger.kernel.org

or

commit d74e766e1916d0e09b86e4b5b9d0f819628fd546
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Tue Mar 8 11:31:00 2016 -0500

    Revert "drm/radeon/pm: adjust display configuration after powerstate"

    This reverts commit 39d4275058baf53e89203407bf3841ff2c74fa32.

    This caused a regression on some older hardware.

    bug:
    https://bugzilla.kernel.org/show_bug.cgi?id=113891

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
    Cc: stable at vger.kernel.org

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