I just tested on the Toshiba Tecra R850 from comment #1, with Oneiric Alpha 3, and confirmed there is corruption on both displays when an external screen is plugged in. The internal screen shows a garbled area at the top, while the external screen is entirely garbled and totally unusable.
This is a fresh A3 install so it's not a random issue.
As per comments 1 and 4 I'll mark this as Fix Released.
I just tested on the Toshiba Tecra R850 from comment #1, with Oneiric Alpha 3, and confirmed there is corruption on both displays when an external screen is plugged in. The internal screen shows a garbled area at the top, while the external screen is entirely garbled and totally unusable.
This is a fresh A3 install so it's not a random issue.
As per comments 1 and 4 I'll mark this as Fix Released.