XO-4 HDMI output

Jon Nettleton jon.nettleton at gmail.com
Thu Jul 18 05:43:16 EDT 2013

On Thu, Jul 18, 2013 at 11:19 AM, Tom Parker <tom at carrott.org> wrote:

> On 17/07/13 21:21, Jon Nettleton wrote:
>> If you want to provide the output of dmesg when you connect your DVI
>> cable I will gladly take a look and see why you aren't at least getting
>> a VESA VGA resolution.
> Today it behaved much better. I don't know why I had such poor luck
> yesterday. Today I tried jiggling the cables but that didn't seem to have
> any effect (ie it continued to work even with quite a lot of jiggling)

Is this a B1 model?  We had a positioning problem with the jack on the B1's
that was fixed in subsequent revisions.  We do have code that tries to
detect cable jitter and not kick of hotplug events accordingly.  Of course
if the cable itself is flaky then there isn't much we can do about that.

> I was able to identify a negative interaction with suspend -- if the
> laptop is suspended when you plug the hdmi cable in, it doesn't wake up and
> the display behaves as if the laptop is off. The couple of times I tried,
> waking the laptop up with the touchpad caused the external display to come
> to life. I don't think this can account for all of yesterday's troubles.

Power Manager should be disabling fast S/R if the hdmi connection is
detected this is just to keep the external display from blanking
continuously.  I have been running hdmi with suspend/resume enabled for
some time now and have not seen any adverse effects.  I will have to test
this with a vanilla 13.2.0 install.

> *snip*

Thanks for the dmesg output.  I will note that we found with some Dell
monitors you needed to go into the config and set the monitor to video mode
instead of computer mode.  I will try to keep everyone posted on the
continued HDMI progress as free time permits me to work on it.

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