From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dirk Gouders <gouders-UkMx63StcVObyvKg4uJg4nF3/sHOsa9/WV23jfQ1LcY@public.gmane.org>
Subject: Re: [Bug #37472] Lenovo U160 (i915 black screen)
Date: Tue, 12 Jul 2011 10:27:01 +0200
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In-Reply-To: <yun7h7pg8y7.fsf-XEHByDMaNQOz9DMzp4kqnw@public.gmane.org> (Keith Packard's message of
	"Sun, 10 Jul 2011 13:46:40 -0700")
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To: Keith Packard <keithp-aN4HjG94KOLQT0dZR+AlfA@public.gmane.org>
Cc: Pekka Enberg <penberg-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, "Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>, Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Kernel Testers List <kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Maciej Rutecki <maciej.rutecki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Florian Mickler <florian-sVu6HhrpSfRAfugRpC6u6w@public.gmane.org>, Robse <rob-se-Dz115AEZgoU@public.gmane.org>, Chris Wilson <chris-Y6uKTt2uX1cEflXRtASbqLVCufUGDwFn@public.gmane.org>

Keith Packard <keithp-aN4HjG94KOLQT0dZR+AlfA@public.gmane.org> writes:

> On Sun, 10 Jul 2011 14:56:19 +0300, Pekka Enberg <penberg-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
>
>> There's no mention that the i915 developers know about this problem so
>> I'm CC'ing Keith and Chris.
>
> Thanks. I've added a comment to the bug:
>
> First off, of course you are encouraged to re-test with 3.0-rc6 just to
> make sure it hasn't changed in some way. I don't think anything has
> changed enough to affect this, but it's always good to be sure.
>
> I note a long sequence of patches that are supposed to help with the
> U160:
>
> 448f53a1ede54eb854d036abf54573281412d650 drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks
> bcfbbce822d219eb587acaba8a6e062bbeae4761 Revert "drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks"
> a76150302d6e7ebc43e1a1ddaee7fd51db8da3b3 drm/i915: Add a module option to override the use of SSC
>
> I'm not sure why a quirk wasn't added for this hardware; it's clearly
> 'non-standard' in some mystic way.

On June 27th, I proposed that Robse perhaps could try the workaround
that was introduced with the latter commit: i915.lvds_use_ssc=0.

It works well on my hardware and probably solves his problem as well,
but he did not respond...

Dirk

[1] https://lkml.org/lkml/2011/6/27/45