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From: Daniel Vetter <daniel@ffwll.ch>
To: Carsten Emde <C.Emde@osadl.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Subject: Re: [PATCH 1/2] drm/i915: clear up backlight inversion confusion on gen4
Date: Mon, 23 Apr 2012 17:22:50 +0200	[thread overview]
Message-ID: <20120423152250.GJ4935@phenom.ffwll.local> (raw)
In-Reply-To: <4F95700D.9080609@osadl.org>

On Mon, Apr 23, 2012 at 05:06:53PM +0200, Carsten Emde wrote:
> On 04/23/2012 04:22 PM, Daniel Vetter wrote:
> >On Mon, Apr 23, 2012 at 04:00:23PM +0200, Carsten Emde wrote:
> >># intel_reg_write 0x61250 0x80000000
> >>Value before: 0xE0000000
> >>Value after: 0x80000000
> >># intel_reg_read 0x61254
> >>0x61254 : 0xB4A0B4A
> >>
> >># intel_reg_write 0x61250 0xa0000000
> >>Value before: 0x80000000
> >>Value after: 0xA0000000
> >># intel_reg_read 0x61254
> >>0x61254 : 0xB4A0B4A
> >>
> >># intel_reg_write 0x61250 0x90000000
> >>Value before: 0xA0000000
> >>Value after: 0x90000000
> >># intel_reg_read 0x61254
> >>0x61254 : 0xB4A0B4A
> >>
> >># intel_reg_write 0x61250 0xb0000000
> >>Value before: 0x90000000
> >>Value after: 0xB0000000
> >># intel_reg_read 0x61254
> >>0x61254 : 0xB4A0B4A
> >>
> >>Not much.
> >
> >The idea was to boot with kms and see whether any of these values would
> >restore the backlight. Writing to CTL1 should change anything in CTL2.
> Ah, sorry, ok. Removed the quirk again and tested the various settings:
> 
> -> Initial screen: dark
> 
> # intel_reg_write 0x61250 0x80000000
> Value before: 0xE0000000
> Value after: 0x80000000
> -> Still dark
> 
> # intel_reg_write 0x61250 0xa0000000
> Value before: 0x80000000
> Value after: 0xA0000000
> -> Still dark
> 
> # intel_reg_write 0x61250 0x90000000
> Value before: 0xA0000000
> Value after: 0x90000000
> -> BACKLIGHT ON!
> 
> # intel_reg_write 0x61250 0xb0000000
> Value before: 0x90000000
> Value after: 0xB0000000
> -> Still ON.

Neat. Let's test two more:

# intel_reg_write 0x61250 0xd0000000
# intel_reg_write 0x61250 0xc0000000

-Daniel
-- 
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48

  reply	other threads:[~2012-04-23 15:21 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-23  9:32 [PATCH 1/2] drm/i915: clear up backlight inversion confusion on gen4 Daniel Vetter
2012-04-23  9:32 ` [PATCH 2/2] drm/i915: pnv has a backlight polarity control bit, too Daniel Vetter
2012-04-23 10:27   ` Chris Wilson
2012-04-23  9:53 ` [PATCH 1/2] drm/i915: clear up backlight inversion confusion on gen4 Chris Wilson
2012-04-23 12:21   ` Daniel Vetter
2012-04-23 12:32     ` Chris Wilson
2012-04-23 13:48       ` Daniel Vetter
     [not found] ` <4F9542EF.3010208@osadl.org>
2012-04-23 12:32   ` Daniel Vetter
2012-04-23 12:36     ` Daniel Vetter
2012-04-23 13:15       ` Carsten Emde
2012-04-23 13:39         ` Daniel Vetter
2012-04-23 14:00           ` Carsten Emde
2012-04-23 14:22             ` Daniel Vetter
2012-04-23 15:06               ` Carsten Emde
2012-04-23 15:22                 ` Daniel Vetter [this message]
2012-04-23 15:38                   ` Carsten Emde
2012-04-23 15:56                     ` Daniel Vetter
2012-04-23 16:55                       ` Carsten Emde
2012-04-26 16:48 ` [PATCH 0/4] drm/i915: " Carsten Emde
2012-04-26 16:48   ` [PATCH 1/4] drm/i915: " Carsten Emde
2012-04-26 16:48   ` [PATCH 2/4] drm/i915: completely revert the invert brightness quirk Carsten Emde
2012-04-26 16:48   ` [PATCH 3/4] drm/i915: add quirk to indicate that an alt bit is used for brightness inversion Carsten Emde
2012-04-26 17:08     ` Daniel Vetter
2012-04-26 17:25       ` [PATCH] properly enable the blc controller on the right pipe Daniel Vetter
2012-04-26 17:27         ` Daniel Vetter
2012-04-26 19:12         ` Carsten Emde
2012-04-26 19:30           ` Daniel Vetter
2012-04-27 20:18             ` Carsten Emde
2012-06-02 23:08               ` Daniel Vetter
2012-06-11  8:51                 ` Daniel Vetter
2012-07-19 14:00                   ` Carsten Emde
2012-07-19 14:40                     ` Daniel Vetter
2012-07-19 22:51                       ` Carsten Emde
2012-07-20  8:10                         ` Daniel Vetter
2012-07-24  7:30                           ` Carsten Emde
2012-07-25 22:35                             ` Carsten Emde
2012-07-26 11:55                               ` [PATCH] drm/i915 disable combination mode Daniel Vetter
2012-07-26 12:20                               ` Daniel Vetter
2012-07-26 12:36                               ` Daniel Vetter
2012-07-26 14:09                               ` Daniel Vetter
2012-04-26 16:48   ` [PATCH 4/4] drm/i915: assign the brightness inversion quirk to Acer Aspire 5734Z Carsten Emde
2012-04-27 16:17   ` [PATCH 0/4] drm/i915: Re: clear up backlight inversion confusion on gen4 Monark Gondaliya

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