I think the original bug report here (NoDCC causes hang) has been fixed.
I am currently testing the trident driver on an ancient laptop here, and
it has many bugs, but this isn't one of them. The "vesa" mode doesn't
work, and most importantly auto-detection doesn't work. Manually writing
your own Xorg configuration and assigning driver as "trident" however,
works fine.

What you need is:
        Driver      "trident"
        Option  "AccelMethod" "EXA"


At that point you get the proper response from Xorg:
(WW) TRIDENT(0): Option "NoDCC" is not used

So it simply skips NoDCC in the config file and in turn skips the hang.

I will be opening another bug report regarding detection.

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https://bugs.launchpad.net/bugs/223774

Title:
  NoDDC option doesn't work for trident cyberblade/i1 resulting in
  system lockup

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