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    SubjectRe: [PATCH 3/3 v2] drm/i915: hot plug/unplug notification to HDMI audio driver
    On Mon, 21 Nov 2011 14:37:49 +0800, Wu Fengguang <> wrote:
    > On monitor hot plug/unplug, update ELD and set/clear SDVO_AUDIO_ENABLE
    > or DP_AUDIO_OUTPUT_ENABLE accordingly. So that the audio driver will
    > receive hot plug events and take action to refresh its device state and
    > ELD contents.
    > A new callback ->hotplug() is added to struct drm_connector_funcs which
    > will be called immediately after ->detect() knowing that the monitor is
    > either plugged or unplugged.
    > It's noticed that X may not call ->mode_set() at monitor hot plug, so it's
    > necessary to call drm_edid_to_eld() earlier at ->detect() time rather than
    > in intel_ddc_get_modes(), so that intel_write_eld() can see the new ELD
    > in ->hotplug.

    The X environment will eventually call mode_set when the user
    environment decides to use the monitor. Any audio bits can, and should,
    await the user's choice of a video mode before choosing the audio format
    to use. We should not be adding eld information until the monitor is in

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