[Bug 97498] [ILK] black flashes and black screen with modesetting or wayland

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97498

--- Comment #8 from groucho <grouchomarx.fr at gmail.com> ---
In case it might help, I have made a reverse bisect a few months back and here
is the commit that fixed the issue for UXA and SNA.

Since many distros seem to be moving to modesetting (and wayland), it would be
great to have even just a workwaround.



commit e2e407dc093f530b771ee8bf8fe1be41e3cea8b3
Author: Matt Roper <email address hidden>
Date: Mon Feb 8 11:05:28 2016 -0800

    drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)

    Due to our lack of two-step watermark programming, our driver has
    historically pretended that the cursor plane is always on for the
    purpose of watermark calculations; this helps avoid serious flickering
    when the cursor turns off/on (e.g., when the user moves the mouse
    pointer to a different screen). That workaround was accidentally
    dropped as we started working toward atomic watermark updates. Since we
    still aren't quite there yet with two-stage updates, we need to
    resurrect the workaround and treat the cursor as always active.

    v2: Tweak cursor width calculations slightly to more closely match the
        logic we used before the atomic overhaul began. (Ville)

    Cc: <email address hidden>
    Cc: <email address hidden>
    Cc: <email address hidden>
    Reported-by: <email address hidden>
    Reported-by: <email address hidden>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93892
    Fixes: 43d59eda1 ("drm/i915: Eliminate usage of plane_wm_parameters from
ILK-style WM code (v2)")
    Signed-off-by: Matt Roper <email address hidden>
    Link: http://patchwork.freedesktop.<email address hidden>
    (cherry picked from commit b2435692dbb709d4c8ff3b2f2815c9b8423b72bb)
    Signed-off-by: Jani Nikula <email address hidden>
    Link: http://patchwork.freedesktop.org<email address hidden>

:040000 040000 545634aa608f59cd8959a6196761450afa57ee5b
7b3259c003cbd1e27e02c976d73af848f69d248c M drivers

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