HDMI hotplug enable?

Greg G. dargllun at googlemail.com
Wed Jun 13 09:04:30 PDT 2012

Hi Alex,

On 13.06.2012 15:57, Alex Deucher wrote:
> Hotplug should work fine.  The problem is the polling and hotplug
> handling share the same common drm code, so I suspect disabling
> polling has an adverse affect on hotplug events getting propagated to
> userspace.  If you enable debugging in the drm (as root: echo 1>
> /sys/module/drm/parameters/debug), you should see some HPD messages in
> your kernel log when you plug/unplug.  If you see the messages, but
> don't see any userspace events, then it's probably the problem I
> described above.  Note that enabling debug when X is running will
> probably generate more information than is useful, so I'd suggest
> enabling it when X is not running (just the radeon kernel driver
> loaded).

Indeed: http://paste.ubuntu.com/1039275/

So it is a bug, that poll=N inhibits propagating HPD events? Is this 
being worked on? Should I enter a bug report somehwere?

> Hotplug should work, and doesn't really have anything to do with hdmi
> audio per se.  The gfx driver needs to get the information for the ELD
> from the monitor via DDC, then pass it to the sound driver, at the
> moment the radeon driver doesn't handle that.

SeriousLy? No ELD for radeon? Sigh. Again - is this being worked on?


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