It was running 2560x1440. I'm not sure if the chip can do 4k although tho Xorg probe suggests it might. Maybe the rest of the interface electronics can't support the higher clock rate. r296547 does correctly run the external monitor at 2560x1440.

Sadly the monitor is an international flight away from me for the 1.5 months so I can't test anything else until I'm back.


On 19 March 2016 01:10:54 Jean-Sébastien Pédron <dumbb...@freebsd.org> wrote:

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


With r296548 on the following hardware:

vgapci0@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:
[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


Cape Augusta Digital Properties, LLC a Cape Augusta Company

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