Hello Christoph,
> On a Intel G4400 "Skylake" with kernel 4.9.47-rt37 I get a reproducible latency spike
> (>200us) when the screen goes to standby.
> The display is connected to the onboard DVI connector. The same thing works fine
> on an older Ivy Bridge CPU. To trigger the spike when in Xorg I use:
>
> xset dpms force off
>
> After setting the options below for the i915 kernel module I was no longer able to
> reproduce the spikes:
> - enable_rc6=0
> - enable_dc=0
> - disable_power_well=0
Similar on our side, but we reduced it and are using only enable_dc=0. CPU is
Celeron 3955U (Skylake).
To be more detailed, a PCIe read command of our real-time software was blocked
for >200us.
regards, gerhard
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