[Bug 76103] [i915GM regression] black screen with self-refresh on fbcon but not X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76103

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #25 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 2ab1bc9df01dbc19b55b2271100db7407fa6bfdc
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Mon Apr 7 08:54:21 2014 +0200

    drm/i915: Disable self-refresh for untiled fbs on i915gm

    Apparently it doesn't work. X-tiled self-refresh works flawlessly
    otoh. Apparently X still works correctly with linear framebuffers, so
    might just be an issue with the initial modeset. It's unclear whether
    this just borked wm setup from our side or a hw restriction, but just
    disabling gets things going.

    Note that this regression was only brought to light with

    commit 3f2dc5ac05714711fc14f2bf0ee5e42d5c08c581
    Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Date:   Fri Jan 10 14:06:47 2014 +0200

        drm/i915: Fix 915GM self-refresh enable/disable

    before that self-refresh for i915GM didn't work at all.

    Kudos to Ville for spotting a little bug in the original patch I've
    attached to the bug.

    Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Cc: Chris Wilson <chris at chris-wilson.co.uk>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76103
    Tested-by: Krzysztof Mazur <krzysiek at podlesie.net>
    Cc: Krzysztof Mazur <krzysiek at podlesie.net>
    Cc: stable at vger.kernel.org
    Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    [Jani: rebase on top of drm-next with primary plane support.]
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

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