On 10/28/16 1:48 AM, Jani Nikula wrote:
On Fri, 28 Oct 2016, Fabian Pie <fpie@xxxxxxxxxxx> wrote:
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
Probably the BIOS skips some DSI initialization in this case, and we
fail to bring it up. Please file a bug over at [1], include the above
description, add drm.debug=14 module parameter, attach dmesg all the way
from boot for both the working and broken cases, plus
/sys/kernel/debug/dri/0/i915_vbt.
Same issue on Asus T100TAF (Baytrail-CR)
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