Windows 10: Intel i5 gen.2 video, no sound with DisplayPort

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{IPPI}

Desktop connected to monitor with built-in speakers. The latest video driver v9.17.10.4459 for i5-2400 Intel HD graphic is installed via windows updates. The device manager shows two "High Definition Audio Divice" under "Sound, video and game controllers". There are no errors, but DisplayPort audio device is gray and "not plugged in" in "Sound"->"Playback" window. The second audio divice is available and has sound. If I uninstall the video driver, the DisplayPort audio device is available and plays sound, but resolution is low. If I click windows update - I get back latest driver, 1080p res

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