My system has problems with the displayport connection. This is indicated by several problems that, at the first glance, do not have anything in common. The reason why I claim DP for being the cause, is that when I connect another monitor via DVI these problems just vanish.

When I put monitor into sleep it won't wake up. Journal contains:

[drm:intel_dp_start_link_train] *ERROR* failed to enable link

and sometimes

[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung

Qt applications need a few seconds to start. And meanwhile freeze X. Today I had a complete never-ending system freeze. As a followup KDE start is painfully slow and accompanied by multiple freezes.

I use an up-to-date Arch System on an i5-4590, using the Intel HD4600.

Here is dmesg with drm.debug=0xe comandline. I cut about a million "[drm:drm_dp_i2c_do_msg] native defer" lines to make it cleaner.

Intel drivers are installed. The config:

# for i in /sys/module/i915/parameters/*; do echo $i=$(cat $i); done

I've had the exact same issues and setting


to 1 solved it for me. Have you tried this?

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.