So Cox in my area has added a "Plus Package" that contains a handful of new HD channels, trialing MPEG4 delivery.
Whenever I tune to one of these channels (about 8 channels) on my main HTPC (w/PCIe Ceton + Intel Video 2000) I get one of two results:
1. A "display driver error" with "does not support playback of protected content"
2. A black screen, but I can hear the audio of the program.
Typically I'll get #1 first, and then #2 occurs on all subsequent attempts to tune the channel.
If I tune to these channels using an XBOX 360 extender they work fine (indicating there is not a problem with the channels themselves, or the Ceton CableCard tuner). Likewise I have a second HTPC with a video card (NVidia) and it can tune them fine.
If the problem continues, I recommend you to post your inquire in the graphics chipset forum, they may have additional information regarding the compatibility using a PCI tuner card and HDCP media playback.
I have two brand new Dell 660s's each with a Hauppauge DCR-2650 and a Cisco STA152 Tuning Adapter. I have worked on this thing for hours and hours and could not get it to work. I then tried it in my old MediaCenter PC with an ATI card and it worked off the bat. Please add me to the list. I have also opened a support ticket but it is clear now that the issue is with the Intel On-Board Video Card.