linux-kernel - Re: [Regression] 4.3.0rc4 through rc7: No LCD backlight on Thinkpad T60P

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Date:	Thu, 29 Oct 2015 08:26:29 -0600
From:	"Simon Wood" <simon@...gewell.org>
To:	linux-kernel@...r.kernel.org
Cc:	michel.daenzer@....com,
	"Ville Syrjälä" 
	<ville.syrjala@...ux.intel.com>, "Samuel Ortiz" <samuel@...tiz.org>
Subject: Re: [Regression] 4.3.0rc4 through rc7: No LCD backlight on Thinkpad
 T60P

On Thu, October 29, 2015 8:07 am, Simon Wood wrote:
>

>> Well, I can confirm that the patch stopped the Oops - but unfortunatly
>> the screen is still dark.
>>
>> Also, Oops _does_ happen with rc2 but the screens is OK with that...
>> Back
>> to looking through the logs.
>
> I couldn't see anything of note in the syslog, so attempted to bisect the
>  problem some - although building takes considerable time on this machine
>  (note 32bit).
>
>
> 4.3.0rc6 - bad
> 4.3.0rc7 - bad
> 4.3.0rc2 - good
> 4.3.0rc4 - bad (049e6dde7e57f0054fdc49102e7ef4830c698b46)
> 4.3.0rc3 - good (9ffecb10283508260936b96022d4ee43a7798b4c)
>
>
> So problem (no LCD backlight) must have been introduced between those.

Well this looks like it might have something to do with it.... will
attempt a build just before it.
--
commit 4281f46ef839050d2ef60348f661eb463c21cc2e
Author: Michel Dänzer <michel.daenzer@....com>
Date:   Mon Sep 28 18:16:31 2015 +0900

    drm/radeon: Restore LCD backlight level on resume (>= R5xx)
--

Cheers,
Simon

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