[Bug 109760] [i915 KMS] No screen image after modeset on Intel Atom x5-Z8300

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109760

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #13 from Jani Nikula <jani.nikula at intel.com> ---
We simply fail to enable the DSI display. DSI being DSI, we don't get errors,
so hard to say why without the hardware.

Obviously the UEFI GOP is able to enable the display, and with i915.fastboot=1
we just don't touch the hardware until the next modeset, which we then fail.

i915.fastboot=1 became the default for VLV and CHV in v5.1 so that explains the
change in behaviour.

Please attach /sys/kernel/debug/dri/0/i915_vbt.

Please redo the register dumps. Boot v5.1 (assuming the default
i915.fastboot=1) and take register dump #1. Then run 'xrandr --output DSI-1
--off --auto' (i.e. display off/on cycle, I hope I got the command line right
from memory) and take register dump #2. Attach both.

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