linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915/opregion: work around buggy firmware that provides 8+ output devices

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Message-ID: <5486BDA0.3000801@intel.com>
Date:	Tue, 09 Dec 2014 17:15:12 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>,
	Dmitry Tunin <hanipouspilot@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Chris Wilson <chris@...is-wilson.co.uk>
CC:	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	jaime.91@...mail.es, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleksij Rempel <linux@...pel-privat.de>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>
Subject: Re: [Intel-gfx] [PATCH] drm/i915/opregion: work around buggy	firmware
 that provides 8+ output devices

On 12/08/2014 07:04 PM, Jani Nikula wrote:
> On Mon, 08 Dec 2014, Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>> On Mon, 08 Dec 2014, Aaron Lu <aaron.lu@...el.com> wrote:
>>> We have a new bug report that has the same problem:
>>> https://bugzilla.kernel.org/show_bug.cgi?id=88941
>>>
>>> The posted patch solves the problem. I know it's not perfect, but it
>>> doesn't seem it would do any harm to existing systems so should be safe.
>>>
>>> Better, if someone can shed some light on how this should be properly
>>> handled, that would be great.
>>
>> There was a bug report that I can't find right now that had a similar
>> problem. I wrote a few patches, even somewhat polished ones (that I now
>> pushed to [1] for reference) to handle extended DIDL. Unfortunately this
>> didn't help the bug reporter because the right one was beyond the
>> extended DIDL too, so I don't think I even sent these to the list.
>>
>> Anyway, just one more data point. This might help your reporter, so
>> worth a try. But it doesn't solve everything.
> 
> [1] http://cgit.freedesktop.org/~jani/drm/log/?h=didl

Thanks for the info, I've asked Dmitry to give it a try.

Regards,
Aaron

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