Learning how to use xrandr helps.  The following command fixed things
substantially:

xrandr -d :0 --output LVDS --mode 0x48

I've attached the output of xrandr -d :0 -q --verbose to see if that
helps create an underlying fix for the bug.  (Or at least, reveals a way
to avoid typing the xrandr command every start, AFTER fixing
.Xauthority)

** Attachment added: "xrandr -q --verbose"
   http://launchpadlibrarian.net/9260191/xrandr_q_verbose

-- 
ATI Driver Gets Black Screen on Radeon 7500 Mobile (Regression)
https://bugs.launchpad.net/bugs/132716
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