[Intel-gfx] Baytrail MIPI/DSI Black when boot with HDMI connected

[Fabian Pie]

Hi,
I'm testing Baytrail device with mipi/dsi display and hdmi output. When I
boot without the hdmi connected the mipi/dsi works OK and after connecting
the hdmi both mipi/dsi and hdmi display graphics OK.
If I boot with the hdmi connected it's selected by the bios as the default
display, Ubuntu only boots in hdmi and it works OK in this display but
MIPI/DSI is black. It's listed as connected by xrandr but I can't reset in
any way.
I didn't find this issue in your bug list. Have you seen anything similar ?
I'm using Ubuntu 16.10 with kernel 4.8.4
Best,
Fabian