I'll just add what I've learned for now.
The kernel video-parameter seems to work for me if I leave out the output from
the line (this is also the experience of at least one other guy I read about on
the #radeonhd IRC channel).
So adding the following line to grub's default kernel parameters
(GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub), makes my virtual terminals
display at the specified resolution:
video=1600x1...@85
(the refresh rate ("@85") was optional for me).
Neither the output names listed by xrandr or in /sys/class/drm worked.
--
KMS does not allow the user to pre-select a resolution
https://bugs.launchpad.net/bugs/530216
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