REGRESSION from 3.8.0 to 3.8.1: Mirroring display works only with 1024x768 (4:3) whereas my laptop has 1366x768 (16:9) external monitor 1920x1080 (16:9)

I have a laptop with an internal 1366x768 (16:9) display and I have connected and external 1920x1080 (16:9) monitor via HDMI. By default the display gets mirrored with only 1024x768 (4:3) because this is the highest common resolution of the two reported by xrandr. I can switch to a large desktop

8086:0166 [ThinkPad Twist S230u 3347] REGRESSION: Mirroring display works only with 1024x768 (4:3) whereas my laptop has 1366x768 (16:9) external monitor 1920x1080 (16:9)

See the following Ubuntu bug report https://bugs.launchpad.net/bugs/1167301 Original bug report --- I have a Lenovo Thinkpad Twist with an internal 1366x768 (16:9) display and I have connected and external 1920x1080 (16:9) monitor via HDMI. By default the display gets mirrored