Just dedicating the cpu0 exclusively to irq1 didn't fix. So I tried to also 
limit the latency to that cpu with:
`echo '5' > /sys/devices/system/cpu/cpu0/power/pm_qos_resume_latency_us` 
The problem is that then the fans are noisy, the notebook gets warmer, the 
power consumption on idle increases from ~4W to ~5.4W. So I went more 
conservative with:
`echo '10000' > /sys/devices/system/cpu/cpu0/power/pm_qos_resume_latency_us`
which allowed cpu0 to enter even C3 states, but that fails :-(

Right now I'm trying with 
`echo 'on' > /sys/bus/serio/devices/serio0/power/control`. 
not much hope that this will help though. 

@Alexander I noticed my Dell (which came with Ubuntu) had irqbalance
installed (I saved a list of all installed software for future
reference; I don't have irqbalance in my Debian install). Do you have
irqbalance installed?

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https://bugs.launchpad.net/bugs/2093376

Title:
  Random keys "stick" repeating until any key is pressed

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