[Bug 108764] The native screen(eDP) would be black when rotate the external screen to inverted from normal

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108764

--- Comment #18 from qwang13 <quanxian.wang at intel.com> ---
(In reply to Jani Nikula from comment #11)
> Reopening, I don't think we have conclusive evidence the problem is in
> userspace, and even if the problem were in userspace, we'd need to identify
> where in the stack and reassign.
> 
> qwang13, please elaborate on the issue. So do I understand correctly that:
> 
> 1) The *external* DP/HDMI display works fine with all rotation options.
> 
> 2) The *embedded* eDP goes black on some *external* DP/HDMI rotation options.
> 
> The attached logs are insufficient. Please add drm.debug=0xf module
> parameter, probably also need log_buf_len=4M or similar because that debug
> option is going to be verbose, reboot, reproduce, attach dmesg all the way
> from boot.

1) yes.
2) 
a.without external, eDP works fine
b.with external DP/HMDI, eDP will black on *external* DP/HDMI rotation options.
-only inverted, others are fine.

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