No, not the "RADEON FRAMEBUFFER DISPLAY DRIVER".  That maintainer list
seems to be incomplete.  The closest one would be "DRM DRIVERS (David
Airlie)" however he pretty much just takes what the AMD developers send
him.  For DisplayPort issues your best bet is to email Alex Deucher and
attach copies of the output of "lspci -vvnn" and "xrandr --prop".  It's
also probably pointing him to
https://bugzilla.kernel.org/show_bug.cgi?id=60231 with it's dmesg that
has been expanded by use of the debug parameter.  To avoid spam in
launchpad I'll say that you can find his email address at
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8a53fa23fd3e7c22d93f28e6aaae8358c53326ba

I'm going to look through the dmesg at
https://bugzilla.kernel.org/show_bug.cgi?id=60231 now.

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https://bugs.launchpad.net/bugs/1035556

Title:
  1002:9442 Monitor not detected via DisplayPort [Radeon HD 4850]

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