On 02/17/2013 02:29 AM, Fengguang Wu wrote:
Hi David,
On Fri, Feb 15, 2013 at 11:02:31PM -0600, Pierre-Louis Bossart wrote:
There's a bummer though. On the one machine I've tested this, the ELD is not
immediately available, so hotplugging doesn't work. It also looks like there's
no
event being sent out from the kernel when ELD has become available, so we
probably
You may print a debug messages in the graphics driver's interrupt handler
for every hotplug event to check if the hotplug event is not raised
from hardware at all, or (likely) get lost somewhere later when
passing it to the audio driver.
need to add some kind of timer - but I'm not sure exactly what time ranges
should
work for all machines. Pierre, do you know?
Trying rebooting with the HDMI cable plugged and see if this works.
I know my IbexPeak hardware only detects HDMI at boot, probably some
BIOS issue. Fengguang might be able to help?
Good tip. It's worth trying, as I noticed the same phenomenon in my
past HDMI tests (HDMI not useable at all if hot-plugged after boot).
For the boot issue, it may be because of some unknown BIOS hack, or
something the graphics driver failed to initialize (or did it right).
To clarify: When hotplugging, the ELD does show up, it just doesn't do
that at the same time as the jack does, that is, eld might become valid
at a later time compared to the "precense" bit.
I looked at the kernel code now, and it seems like there is a repoll
mechanism to fetch the ELD information. It shouldn't be too difficult to
insert a snd_ctl_notify when the ELD control changes (as Tanu suggests),
I will look into this next week hopefully.
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
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