OK. That's a third point of proof that you're not running XMir. You have an interlaced mode "1920x1080i" which is not possible with Mir. So this can't be a Mir or XMir bug.
The X log files say it's "radeon" misdetecting the display size. So I'll reassign the bug to that...
[ 21.327] (II) RADEON(0): clock: 27.0 MHz Image Size: 160 x 90 mm
OK. That's a third point of proof that you're not running XMir. You have an interlaced mode "1920x1080i" which is not possible with Mir. So this can't be a Mir or XMir bug.
The X log files say it's "radeon" misdetecting the display size. So I'll reassign the bug to that...
[ 21.327] (II) RADEON(0): clock: 27.0 MHz Image Size: 160 x 90 mm