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Subject: Re: [i915] WARNING: CPU: 2 PID: 183 at
 drivers/gpu/drm/i915/intel_display.c:14584 intel_modeset_init+0x3be/0x1060
To: Fengguang Wu <fengguang.wu@intel.com>
Cc: intel-gfx@lists.freedesktop.org,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
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        =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@linux.intel.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Imre Deak <imre.deak@intel.com>,
        Chris Wilson <chris@chris-wilson.co.uk>,
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References: <20180419025256.vtt37aljreb2wzrj@wfg-t540p.sh.intel.com>
 <0427eb0b-0382-db2c-72c5-0cbc867d4370@linux.intel.com>
 <20180419110505.wy47nheshalanxek@wfg-t540p.sh.intel.com>
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Message-ID: <e7cee8ae-f3b4-f342-f381-8ed48809148e@linux.intel.com>
Date: Thu, 19 Apr 2018 16:39:30 +0200
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Op 19-04-18 om 13:05 schreef Fengguang Wu:
> Hi Maarten,
>
>> What extra dmesg output do you get when you boot with drm.debug=0x1f ?
>
> Attached is the dmesg with drm.debug=0x1f.
>
> Thanks,
> Fengguang

Ah so we're inheriting the FB 2x, once with 1280x1024, other with 1366x768:

kern  :debug : [   74.880444] [drm:i9xx_get_initial_plane_config [i915]] pipe A/primary A with fb: size=1366x768@32, offset=61000, pitch 5504, size 0x408000
kern  :debug : [   74.881187] [drm:i915_gem_object_create_stolen_for_preallocated [i915]] creating preallocated stolen object: stolen_offset=0x0000000000061000, gtt_offset=0x0000000000061000, size=0x0000000000408000
kern  :debug : [   74.882197] [drm:intel_alloc_initial_plane_obj.isra.126 [i915]] initial plane fb obj 000000005efa24f9

kern  :debug : [   74.883532] [drm:i9xx_get_initial_plane_config [i915]] pipe B/primary B with fb: size=1280x1024@32, offset=61000, pitch 5504, size 0x560000
kern  :debug : [   74.884260] [drm:i915_gem_object_create_stolen_for_preallocated [i915]] creating preallocated stolen object: stolen_offset=0x0000000000061000, gtt_offset=0x0000000000061000, size=0x0000000000560000
kern  :debug : [   74.885295] [drm:i915_gem_object_create_stolen_for_preallocated [i915]] failed to allocate stolen space

Which of course fails, but should be an interesting case to handle right. :)

~Maarten