linux-kernel - Re: [PATCH] drm/i915: i915.disable_pch_pwm overrides PCH_PWM

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Date:	Tue, 3 Sep 2013 19:50:00 +0200
From:	Daniel Vetter <daniel.vetter@...ll.ch>
To:	Kamal Mostafa <kamal@...onical.com>
Cc:	David Airlie <airlied@...ux.ie>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/i915: i915.disable_pch_pwm overrides PCH_PWM_ENABLE quirk

On Tue, Sep 3, 2013 at 7:37 PM, Kamal Mostafa <kamal@...onical.com> wrote:
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=47941
>
> Some BIOS configurations of Dell XPS13 are adversely affected by e85843b
> ("drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight") so provide a
> boot param to inhibit the quirk, or force it on.
>
> i915.disable_pch_pwm can be set to
>  -1: auto (default; allows the disabling of pch_pwm by dmi quirk table match)
>   0: inhibits the disabling of pch_pwm (overrides dmi quirk table match)
>   1: forces the disabling of pch_pwm
>
> Signed-off-by: Kamal Mostafa <kamal@...onical.com>

Nack. Piling quirk over quirk isn't the right approach and I think I
should just revert the pch_pwm enable quirk again.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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