drm-next-kmod + Broadwell = console 0.2 Hz refresh

Jakob Alvermark jakob at alvermark.net
Mon Nov 27 15:16:36 UTC 2017


I have been using drm-next-kmod for a while now, and it works fine, 
except for this little annoying thing.

On this Lenovo ThinkPad Yoga 12 (i7-5500U) I have 
kld_list="/boot/modules/i915kms.ko" in /etc/rc.conf

Shortly after the module is loaded, the console (vt) refreshes only 
about every 5 seconds or so.

This only happens on the builtin laptop screen, when I have an external 
monitor connected the external monitor is working normally. (Display is 
output to both, and the internal screen still has the slow refresh)

Starting X and switching back to vt or quitting X and it is working 

Another thing that might be related; switching windows in X with alt-tab 
(xfce) is also slow (on the order of 5 seconds).

I have another laptop I am using drm-next-kmod on (Pentium N3540) which 
doesn't show any of this behavior.

Any idea?



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