[Bug 89419] [SKL][Audio][HD-A Display]: Can't detect Display audio codec if not connect HDMI and DP monitor when boot up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89419

--- Comment #24 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Libin Yang from comment #23)
> As the hdmi audio can be deteced successfully when monitor is connected,
> could you please check what's the difference gfx driver will do freom
> monitor isn't connected?

For one, you can't expect to be able to read the registers (or the read values
to make sense) *unless* you've called the ->get_power() function through the
component API. There are plenty of audio registers that i915 never touches but
need the power well from i915 to operate. And you should expect the registers
to lose their values after you ->put_power(). Check bspec.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20150401/e9961803/attachment.html>