From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 28 Oct 2016 17:10:00 +0300
From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Peter Wu <peter@lekensteyn.nl>
Cc: Rick Kerkhof <rick.2889@gmail.com>, linux-acpi@vger.kernel.org,
        nouveau@lists.freedesktop.org, linux-pci@vger.kernel.org,
        Robert Moore <Robert.Moore@intel.com>,
        Lv Zheng <lv.zheng@intel.com>
Subject: Re: Acer Aspire V7-582PG (Haswell, GTX 750M) fails to power off GPU
 via Power Resources
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On Fri, Oct 28, 2016 at 02:30:41PM +0200, Peter Wu wrote:
> It was correctly applied. I did some testing with QEMU, it seems that
> the \_OSI check is problematic. Removing it makes things work again.

I hope Bob and Lv can answer why _OSI fails.

In the meantime I think we should check flags.power_resources in nouveau
driver (in addition to _PR3) so that it falls back to _DSM if there are
no power resources (or if we failed to evaluate them for some reason).