I had problems too with S3 stand-by and the W7 drivers of Floppy DTV 5.7. Solved my issue to go to hibernation S4. Windows 8 is fast starting by itself and running fine.
With the standard driver in Win8 I also had issues with standbyl. Not only that but if I did anything else than just watch TV (like copying a small file on a SSD or switching windows) I got major stuttering. I didn't try the Thesycon driver but rather installed a copy of the W7 legacy driver. Now it works like a charm again.
I'm running Windows 8.1 x64 RTM, and copied my files from Windows 7 Professional x64.
I successfully installed the FireDTV in Administrator and Windows 7 Compatibility Mode. However, running MediaPortal 1.5, I receive "Tuner Not Found" errors when trying to tune into a channel, both with the Thesycon IEEE1394 driver ( http://www.photometrics.com/support/downloads/software/Thesycon-Installer.zip ) and also with the method below:
2. Copy all these files into a folder of your choice on your Windows 8 computer.
3. Press the Win + C keyboard combination to bring up the Charms Bar,
then click on the Settings Charm.
4. We need to head into the Modern Control Panel, so go ahead and
click on the Change PC settings link.
5. When the Control Panel opens, switch over to the “Update & recovery” section.
6. Then click on the Recovery option on the left hand side.
7. Once selected, you will see an advanced startup section appear on
the right hand side. You will need to click on the “Restart now”
button.
8. Once your Computer has rebooted you will need to choose the
Troubleshoot option.
9. Then head into Advanced options.
10. Then Startup Settings.
11. Since we are modifying boot time configuration settings, you will
need to restart your Computer one last time.
12. Finally, you will be given a list of startup settings that you can
change. The one we are looking for is “Disable driver signature
enforcement”. To choose the setting, you will need to press the F7
key.
13. That’s all there is to it. Your PC will then reboot and you will
be able to install unsigned drivers without any error message