linux-kernel - Re: [PATCH] drm/i915: fix failure to power off after hibernate

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Date:	Thu, 26 Feb 2015 21:29:31 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Imre Deak <imre.deak@...el.com>, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] drm/i915: fix failure to power off after hibernate

Ville Syrjälä <ville.syrjala@...ux.intel.com> writes:

>> @@ -651,7 +651,14 @@ static int i915_drm_suspend_late(struct drm_device *drm_dev)
>>  	}
>>  
>>  	pci_disable_device(drm_dev->pdev);
>> -	pci_set_power_state(drm_dev->pdev, PCI_D3hot);
>> +	/*
>> +	 * During hibernation on some GM45 platforms the BIOS may try to access
>> +	 * the device even though it's already in D3 and hang the machine. So
>> +	 * leave the device in D0 on those platforms and hope the BIOS will
>> +	 * power down the device properly.
>
> Please include the model of the known bad machine in this comment, to
> help future archaeologists.

Here are some details:

bjorn@...i:~$ grep . /sys/class/dmi/id/{bios,product}* 2>/dev/null 
/sys/class/dmi/id/bios_date:12/19/2011
/sys/class/dmi/id/bios_vendor:LENOVO
/sys/class/dmi/id/bios_version:6EET55WW (3.15 )
/sys/class/dmi/id/product_name:2776LEG
/sys/class/dmi/id/product_version:ThinkPad X301

Please let me know if you need some other data.


Bjørn
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