broken edid

Michael Zoran mzoran at
Tue Mar 21 06:47:54 PDT 2017

On Tue, 2017-03-21 at 14:34 +0100, Gerd Hoffmann wrote:
>   Hi,
> Apparently something corrupted the hdmi edid of the monitor I've
> hooked
> up to the rpi3.  So the firmware comes up in some low res instead of
> 1920x1080, and vc4 complains and refuses to display anything.
> Tried to fix the edid.  Reading (via /dev/i2c-2) works.  Writing
> fails
> with an io error though, there is even a message in the kernel log
> (i2c-bcm2835 3f805000.i2c: i2c transfer failed: 100).  I'm using
>  4.9.16 kernel.  Ideas anyone?
> Failing that, is there some way to force vc4 into driving hdmi at
> 1920x1080?
> cheers,
>   Gerd
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> linux-rpi-kernel mailing list
> linux-rpi-kernel at


Any particular reason VC4 couldn't have a few module paremeters added
as a short term/get things going fix.  That would at least allow people
to hard code the video setting in the command line.

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