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

[Jakob Alvermark]

On 11/27/17 15:37, Jakob Alvermark wrote:
> Hi,
>
>
> 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 
> normally.
>
> Another thing that might be related; switching windows in X with 
> alt-tab (xfce) is also slow (on the order of 5 seconds).
Tested this with scfb, and alt-tabbing is quick.
>
> I have another laptop I am using drm-next-kmod on (Pentium N3540) 
> which doesn't show any of this behavior.
>
> Any idea?
>
>
> Thanks,
>
> Jakob
>
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