[PATCH] drm/fb_helper: Disable all crtc's when initial setup fails.

[Thomas Voegtle]

On Tue, 28 Nov 2017, Daniel Vetter wrote:

> On Tue, Nov 28, 2017 at 12:16:03PM +0100, Maarten Lankhorst wrote:
>> Some drivers like i915 start with crtc's enabled, but with deferred
>> fbcon setup they were no longer disabled as part of fbdev setup.
>> Headless units could no longer enter pc3 state because the crtc was
>> still enabled.
>>
>> Fix this by calling restore_fbdev_mode when we would have called
>> it otherwise once during initial fbdev setup.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>> Fixes: ca91a2758fce ("drm/fb-helper: Support deferred setup")
>
> Please use dim fixes to get a more complete Cc: list for regression fixes.
>
>> Cc: <stable at vger.kernel.org> # v4.14+
>> Reported-by: Thomas Voegtle <tv at lio96.de>
>
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>
> But please confirm with the reporter that it indeed fixes the issue before
> pushing.
> -Daniel

I re-checked the latest version of the patch and it indeed fixes the 
problem.

Thanks,

    Thomas