r296548 breaks external DP and HDMI on HD4000

[Jean-Sébastien Pédron]

On 14/03/2016 18:59, Ian FREISLICH wrote:
> Hi

Hi!

> With r296548 on the following hardware:
> 
> vgapci0 at pci0:0:2:0:     class=0x030000 card=0x15171043 chip=0x01668086
> 
> I get the following console messages when X starts and my external
> monitor (Samsung U28E590) goes into epileptic fit attack mode.
> 
> [drm] Initialized i915 1.6.0 20080730 for drmn0 on minor 0
> [drm:pid0:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
> [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off
> [drm:pid0:intel_cpt_verify_modeset] *ERROR* mode set failed: pipe 0 stuck
> [drm:pid1100:ironlake_check_fdi_lanes] *ERROR* WARN ON:
> I915_READ(SOUTH_CHICKEN1) & FDI_BC_BIFURCATION_SELECT
> [drm:pid1100:ivb_manual_fdi_link_train] *ERROR* FDI train 1 fail!
> [drm:pid1100:ivb_manual_fdi_link_train] *ERROR* FDI train 2 fail!

On my Haswell laptop, the external DisplayPort doesn't work either. When
using Ultra HD, I get garbage. When using Full HD, the image is correct
for a few seconds, then the output connector is disabled (talking about
Panel status timeout in dmesg).

What resolution do you use with your monitor? If you're using Ultra HD,
could you please try Full HD?

-- 
Jean-Sébastien Pédron

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