After you raise the "format change" event, Windows should requery your format support via the proposed format handler and your data intersection handler. If you fail all requests for 44.1 formats in your data intersection handler, then that should not appear in the list of supported formats in the Sound control panel. Can you confirm that you're seeing calls to your data intersection handler and proposed format handler shortly after you raise the event? From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Neetu Sand Sent: Thursday, September 27, 2012 9:42 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: KSEVENT_PINCAPS_FORMATCHANGE - bug in win8 control panel? Say if I change from 44.1 kHz to 96 kHz then Sound and Audio CPL should show all formats related to 96 kHz. In Windows 8, it shows all formats (different bit depths) related to 96 kHz as well it shows one entry for 44.1 kHz. This entry (44.1 kHz) is selected as default entry. Yes, driver is exposing preferred format in "PropertyHandlerProposedFormat" GET request. On Thu, Sep 27, 2012 at 9:21 PM, Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx<mailto:Matthew.van.Eerde@xxxxxxxxxxxxx>> wrote: What were the old and new lists? What was the previously selected format? Do you expose a "preferred" format? From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>] On Behalf Of Neetu Sand Sent: Thursday, September 27, 2012 4:01 AM To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx> Subject: [wdmaudiodev] KSEVENT_PINCAPS_FORMATCHANGE - bug in win8 control panel? Hi All, We have a driver that supports dynamic format changes on windows 7. I tried same driver on windows 8 and here is what I have observed: - When I change sample rate, Sound and audio control panel correctly updates the sample rate list to reflect the formats related to new sample rate. - The default selected sample rate is set to previous/last selected sample rate. - When I try to play something in media player after changing sample rate, Sound and Audio CPL uses old sample rate. Is this a bug in Windows 8 or has anything changed on windows 8?? cheers Neetu