It is better to re-install stock mafw-gst-...-renderer , as new kernel-power is already build here, which will allow HD resolutions without modified mafw-gst-renderer.

@Hurrian - new bridgedriver.ko is still needed, WCD_CallDevIOCtl messages you receive are because of the difference in ioctl codes which gst-dsp on Harmattan uses. I will build compatible bridgedriver.ko and will attach it on first post soon. The bad news is that I still don't have response from Felipe Contreras re gst-dsp source code, maybe I sent the mail to wrong destination. Will try again to reach him. Once I have tis source code, there will be no more need for special bridgedriver.ko, but for now it is still needed.