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

[Fabian Pie]

Ready https://bugs.freedesktop.org/show_bug.cgi?id=98467 . Thanks.

-----Mensaje original-----
De: Jani Nikula [mailto:jani.nikula at linux.intel.com] 
Enviado el: viernes, 28 de octubre de 2016 3:49 a. m.
Para: Fabian Pie <fpie at teleker.com>; 'Pierre-Louis Bossart'
<pierre-louis.bossart at linux.intel.com>; intel-gfx at lists.freedesktop.org
CC: 'Chris Wilson' <chris at chris-wilson.co.uk>
Asunto: Re: Baytrail MIPI/DSI Black when boot with HDMI connected

On Fri, 28 Oct 2016, Fabian Pie <fpie at teleker.com> 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.

BR,
Jani.

[1]
https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel



--
Jani Nikula, Intel Open Source Technology Center