linux-kernel - Re: [PATCH] drm/i915: Fix invalid backpanel values for GEN3 or older chips

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 16 Nov 2011 22:15:41 -0800
From:	Keith Packard <keithp@...thp.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Daniel Mack <zonque@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Jesse Barnes <jbarnes@...tuousgeek.org>, harald@...hat.com,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Fix invalid backpanel values for GEN3 or older chips

On Wed, 16 Nov 2011 18:14:55 +0100, Takashi Iwai <tiwai@...e.de> wrote:

> While refactoring of backlight control code in commit [a95735569:
> drm/i915: Refactor panel backlight controls], the handling of the bit
> 0 of duty-cycle was gone except for pineview.  This resulted in invalid
> register values for old chips like 915GM.  When the bit 0 is set, the
> backlight is turned off suddenly.

I'm looking at the mentioned patch and I don't see how that managed to
correctly handle bit 0; is this the patch that managed to break this?

-- 
keith.packard@...el.com

Content of type "application/pgp-signature" skipped