No Dolby Digital through DVD player

It could have to do with the settings on each input device (xbox & DVR) -check their audio settings. I have a better solution for your problem though:
Since HDMI supports 7.1 ch of digital sound, I'd recommend using the optical inputs on your HTR-6130 that are made for 5.1 ch sound. I agree that you should be getting sound via HDMI, I was able to from my xbox to my 6130, but it gets cut down to 2 channel sound (good, but pales compared to true 5.1 ch sound). It believe it has to do with Dolby not being backward compatible going from 7.1 to 5.1. Anyhow, in order to get an optical-out on your xbox, you'll need connect with the a/v cables that came with the xbox, along with the HDMI cable. Depending on how old your xbox is, and which model (like an elite edition, etc), You may need to buy a special converter that will allow enough room for both an HDMI connection and the A/V connection. Trust me, I have an HTR-6130 with an xbox and a cable-provider issued box running through it. Optical is the way to go for this particular receiver since it only supports 5.1 ch sound. You can still use the HDMI ports on the receiver as a switch between your two devices, or you could choose to bypass it if you TV has more than one HDMI input port.

If you would like to use high definition audio decoding, connect the HDMI from the blu ray player to the receiver. If that it not an option for you due to lack of equipment such as an additional HDMI cable to go from the receiver to the television for the video portion of the signal, then connect your optical cable again. After the optical cable is connected, make sure the Dolby Digital decoding is enabled on the receiver, and that the media you are playing also has a version of 5.1 surround sound. Then, enter the setup menu of the player (which I suspect this is actually where the problem might reside in your case) and make sure that Dolby Digital and DTS are not set to "downmix." Dolby Digital should be set to output Dolby Digital and so on and so forth...hope this helped.

its not how there connected its in your settings. rehook up all your speaker connections properly,then make sure you proram the reciever to recieve fiber optic,hdmi,digital coax etc in the reciver.

Connect the DVD player audio with digital coax into the digital audio connection as you described and the DVD video directly to the TV. Now switch the input mode on the receiver to DVD. Then switch the video output mode on the TV to correspond to the input you plugged into. Any source in 5.1 dolby digital or dts should now work properly and have picture too.

You can set the receiver to any source that uses a optical connection. Then make sure that whatever you select whether it be CD/DVD you also have the source connection set to optical too on the receiver setup menu.
That being said, after that is done you will need to set up the computer to output audio. That usually just involves changing the output mode on the computer and adjusting the levels...open the Acer audio managment application, choose the audio output mode to stereo or dolby digital and turn everything up on the computers level controls. Then, when you open whatever software you're going to use to play your discs you may also have to adjust the volume level there as well.

I know nothing about tivo but dvd player might need to be on bitstream to pick it up.I have to change mine when listening to music. hope this might help.

Well, first of all, the method you are using is the lowest quality. You should upgrade to a toslink(digital optical cable) or a digital RCA cable. The toslink is the best all around. But it is normal for some devices to have higher sound output than others.

You may need to set up the receiver for your speaker configuration. There should be a setup menu on the receiver, and that will allow you to tell the amp what speakers you are using, and what inputs you are connecting what devices to. You may also need to set your DVD player, cable box and TV for the audio stream you want to use. PCM or Bitstream to be more precise. Also make sure that the sound output is set to Dolby Pro Logic or Dolby Digital and the input signal is in stereo or surround.

Best Wishes.

The HTR-6130 does not decode the audio from the HDMI inputs. It only acts as a switcher. You will need a separate audio connection from the cable box to the HTR-6130.