[Bug 90861] [SNB/HSW/BSW/SKL bisected] black screen on DP+eDP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90861

--- Comment #17 from ye.tian <yex.tian at intel.com> ---
(In reply to Maarten Lankhorst from comment #15)
> Created attachment 116355 [details] [review]
> Copy hw settings to adjusted mode
> 
> Examining things more closely I noticed this as the first difference..
> 
> Bad:
> [drm:intel_dump_pipe_config] requested mode:
> [drm:drm_mode_debug_printmodeline] Modeline 0:"" 0 108000 1280 1328 1440
> 1688 1024 1025 1028 1066 0x0 0x5
> [drm:intel_dump_pipe_config] adjusted mode:
> [drm:drm_mode_debug_printmodeline] Modeline 0:"" 0 0 0 0 0 0 0 0 0 0 0x0 0x5
> 
> Good:
> [drm:intel_dump_pipe_config] requested mode:
> [drm:drm_mode_debug_printmodeline] Modeline 0:"1280x1024" 60 108000 1280
> 1328 1440 1688 1024 1025 1028 1066 0x48 0x5
> [drm:intel_dump_pipe_config] adjusted mode:
> [drm:drm_mode_debug_printmodeline] Modeline 0:"1280x1024" 60 108000 1280
> 1328 1440 1688 1024 1025 1028 1066 0x48 0x5
> 
> 
> Could you test if this fixes the bug? If not attach a new log?

Test it on latest nightly kernel with the patch, This issue does not exists.

But It will cause somes errors. please see the dmesg log.
"[drm:check_crtc_state [i915]] *ERROR* mismatch in fdi_lanes (expected 2, found
4)"

BTW, This issue does not exists on HSW with the latest nightly
kernel.(rc6_drm-intel-nightly_d4f412_20150606+)

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