[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #10 from Samir Ibradžić <sibradzic at gmail.com> ---
(In reply to N.Leiten from comment #8)
> Created attachment 115731 [details]
> FHD Panel Datasheet.
> 
> Due this datasheet the panel looks the same as for DP configuration
> comparing whith N133HSE-EA1 (asus u38n) panel. So it needs 2 lanes to init
> video stream.
> 
> As for your dmesg, I see problem in dp_aux_ch and training procedure (the
> voltage and emphasis is 0 which is not right at this point). Need to debug
> further when I publish my patch and if it not help.
> 
> One more thing, do you have FullHD (1920x1080) panel or WHD (1366x768) one.
> Because on Lenovo site I see Thinkpad e455 base model with WHD. The last one
> need only 1 DisplayPort lane to work.

Are you saying these may be an issue:

[drm:radeon_dp_aux_transfer_native] dp_aux_ch flags not zero: 00000201
[drm:drm_dp_i2c_do_msg] transaction failed: -5

?

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