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From: Keith Packard <keithp@keithp.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Robert Morell <rmorell@nvidia.com>
Cc: DRI mailing list <dri-devel@lists.freedesktop.org>
Subject: Re: "EDID checksum is invalid"
Date: Wed, 07 Jan 2015 23:05:22 -0800	[thread overview]
Message-ID: <86lhldeor1.fsf@hiro.keithp.com> (raw)
In-Reply-To: <CA+55aFyMR-k+cNxpyMSddfwAFWjS85rPP0eN86tD8sbUsOQ7WA@mail.gmail.com>


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Linus Torvalds <torvalds@linux-foundation.org> writes:

> I'm assuming even the hdmi +5V line is under sw control at least for
> power management reasons. Maybe dpms off turns it off, and shouldn't?
> My monitor actually says "No HDMI (HML) Cable" when I do "xset dpms
> force off". Maybe that's normal, but maybe that's indicative of dpms
> turning things a bit *too* off?

How about getting a breakout cable so we can actually check the +5V
line to see when it turns off?

Total Phase makes one, although they only have the DVI ones in stock. A
couple of HDMI to DVI converters would let you use this.

        http://www.totalphase.com/products/video-dvi/

I've even got an i2c protocol sniffer if you want to see what's going on
the DDC bus directly.

-- 
-keith

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  parent reply	other threads:[~2015-01-08  7:05 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-07  2:01 "EDID checksum is invalid" Linus Torvalds
2015-01-07  6:07 ` Keith Packard
2015-01-07  6:21   ` Robert Morell
2015-01-07  6:42     ` Keith Packard
2015-01-07 17:07     ` Linus Torvalds
2015-01-07 17:51       ` Daniel Vetter
2015-01-07 18:03         ` Linus Torvalds
2015-01-08  7:05       ` Keith Packard [this message]
2015-01-07  7:32 ` Daniel Vetter
2015-01-07 17:51   ` Linus Torvalds
2015-01-07 20:06     ` Daniel Vetter

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