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<blockquote data-quote="CyberSimian" data-source="post: 1290602" data-attributes="member: 141969"><p>One possibility is whether the device connected to the HDMI cable maintains the connection when in standby:</p><ul> <li data-xf-list-type="ul">My old Toshiba LCD TV <strong>does not</strong> maintain the connection, which means that Windows can detect that there is no output device available.</li> <li data-xf-list-type="ul">My current Sony LCD TV <strong>maintains the connection</strong> when in standby, which means that Windows thinks that the output device is connected all of the time, and Windows cannot detect that the device is in standby.</li> </ul><p>So, perhaps your old AV receiver maintains the connection, but your new AV receiver does not, and this is affecting Windows or MP in some way.</p><p></p><p>You can check this by using Windows "devcon.exe" to query the device table. Typically there are many hundreds of entries in the device table, but the entry for the output device should be somewhere near the start. So:</p><ul> <li data-xf-list-type="ul">Run "devcon.exe" with the old AV receiver connected and switched on, and direct the output to a file.</li> <li data-xf-list-type="ul">Repeat with the AV receiver in standby, directing the output to a different file. Note: you won't be able to see what you are typing when you do this, since the screen will be blank (assuming that the connections are: HTPC->AV receiver->TV).</li> <li data-xf-list-type="ul">Compare the output files to identify any changes.</li> <li data-xf-list-type="ul">Repeat the previous three steps using the new AV receiver.</li> </ul><p>If your AV receivers behave differently, you might find:</p><ul> <li data-xf-list-type="ul">The output files for the old AV receiver are identical.</li> <li data-xf-list-type="ul">The output files for the new AV receiver differ, with the AV receiver being absent from the device table when the receiver is in standby.</li> </ul><p>The command to use is:</p><p>[code]devcon.exe status * >devcon.list[/code]</p><p>The asterisk matches all device names, so you can restrict the list by being more specific. Here are a couple of entries from my HTPC when it was using the Toshiba TV:</p><p>[code]DISPLAY\TSB0102\5&8835E1A&0&UID1048849</p><p> Name: Generic PnP Monitor</p><p> Driver is running.</p><p>HDAUDIO\FUNC_01&VEN_8384&DEV_7618&SUBSYS_10280215&REV_1002\4&26E0D281&0&0001</p><p> Name: High Definition Audio Device</p><p> Driver is running.[/code]</p><p></p><p>I don't think that "devcon.exe" is installed by default, but you may find that other applications have installed it. On my HTPC, it was included in the driver package for my TBS tuner card; on my laptop, it is included in the Gigabyte ControlCenter application. See <a href="https://learn.microsoft.com/en-us/windows-hardware/drivers/devtest/devcon" target="_blank">this Microsoft page</a>.</p><p></p><p>My HTPC also has sound problems. Specifically, when I wake it from hibernation and start the MP client, occasionally there will be no sound for live TV, recorded TV, or video. But: the amplifier is not muted, MP is not muted, and Windows is not muted. I eventually found that the way to reset this was to:</p><ul> <li data-xf-list-type="ul">Exit the MP client.</li> <li data-xf-list-type="ul">Start the "Nvidia Control Panel" application.</li> <li data-xf-list-type="ul">Disable digital audio over HDMI and click "Apply".</li> <li data-xf-list-type="ul">Re-enable digital audio and click "Apply".</li> </ul><p>When the MP client was restarted, there would now be sound. However, the need to reset the audio in this way was quite annoying, as it occurred several times per week, so in the end I stopped using audio over HDMI. Instead, I connected the motherboard's digital audio output to a DAC, and then connected the DAC to my analogue audio amplifier. This never loses the audio, but introduces the possibility of loss of lip sync, due to the audio and video passing through different devices.</p><p></p><p>I don't know what causes my audio problem, but maybe it is a bug in the Nvidia driver. My new HTPC (when I eventually get around to completing it) will use an AMD graphics card, and it will be interesting to see if that fixes the audio problem, or whether it too suffers from missing sound.</p><p></p><p>-- from CyberSimian in the UK</p></blockquote><p></p>
[QUOTE="CyberSimian, post: 1290602, member: 141969"] One possibility is whether the device connected to the HDMI cable maintains the connection when in standby: [LIST] [*]My old Toshiba LCD TV [b]does not[/b] maintain the connection, which means that Windows can detect that there is no output device available. [*]My current Sony LCD TV [b]maintains the connection[/b] when in standby, which means that Windows thinks that the output device is connected all of the time, and Windows cannot detect that the device is in standby. [/LIST] So, perhaps your old AV receiver maintains the connection, but your new AV receiver does not, and this is affecting Windows or MP in some way. You can check this by using Windows "devcon.exe" to query the device table. Typically there are many hundreds of entries in the device table, but the entry for the output device should be somewhere near the start. So: [LIST] [*]Run "devcon.exe" with the old AV receiver connected and switched on, and direct the output to a file. [*]Repeat with the AV receiver in standby, directing the output to a different file. Note: you won't be able to see what you are typing when you do this, since the screen will be blank (assuming that the connections are: HTPC->AV receiver->TV). [*]Compare the output files to identify any changes. [*]Repeat the previous three steps using the new AV receiver. [/LIST] If your AV receivers behave differently, you might find: [LIST] [*]The output files for the old AV receiver are identical. [*]The output files for the new AV receiver differ, with the AV receiver being absent from the device table when the receiver is in standby. [/LIST] The command to use is: [code]devcon.exe status * >devcon.list[/code] The asterisk matches all device names, so you can restrict the list by being more specific. Here are a couple of entries from my HTPC when it was using the Toshiba TV: [code]DISPLAY\TSB0102\5&8835E1A&0&UID1048849 Name: Generic PnP Monitor Driver is running. HDAUDIO\FUNC_01&VEN_8384&DEV_7618&SUBSYS_10280215&REV_1002\4&26E0D281&0&0001 Name: High Definition Audio Device Driver is running.[/code] I don't think that "devcon.exe" is installed by default, but you may find that other applications have installed it. On my HTPC, it was included in the driver package for my TBS tuner card; on my laptop, it is included in the Gigabyte ControlCenter application. See [URL='https://learn.microsoft.com/en-us/windows-hardware/drivers/devtest/devcon']this Microsoft page[/URL]. My HTPC also has sound problems. Specifically, when I wake it from hibernation and start the MP client, occasionally there will be no sound for live TV, recorded TV, or video. But: the amplifier is not muted, MP is not muted, and Windows is not muted. I eventually found that the way to reset this was to: [LIST] [*]Exit the MP client. [*]Start the "Nvidia Control Panel" application. [*]Disable digital audio over HDMI and click "Apply". [*]Re-enable digital audio and click "Apply". [/LIST] When the MP client was restarted, there would now be sound. However, the need to reset the audio in this way was quite annoying, as it occurred several times per week, so in the end I stopped using audio over HDMI. Instead, I connected the motherboard's digital audio output to a DAC, and then connected the DAC to my analogue audio amplifier. This never loses the audio, but introduces the possibility of loss of lip sync, due to the audio and video passing through different devices. I don't know what causes my audio problem, but maybe it is a bug in the Nvidia driver. My new HTPC (when I eventually get around to completing it) will use an AMD graphics card, and it will be interesting to see if that fixes the audio problem, or whether it too suffers from missing sound. -- from CyberSimian in the UK [/QUOTE]
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