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Subjectpowersaving-related hangs on T460s
I tried 4.15-git on my Thinkpad T460s laptop. It is working but I have 
problems waking up the computer after it has been idle.

There should be no suspend (to keep network connections alive) when the
laptop is on AC power, even when the lid is closed. In dmesg, I have
seen no indication of suspend happening. It is configured to just lock
the screen when the lid is closed.

Normally, I have to press a key after opening the lid to unblank the
screen and get to password prompt. Usually this works but sometimes
there is no response - power LED is on that is all, holding down power
button is the only way out.

Sometimes it happens overnight, sometimes it is alive in the morning. It
almost never happens with short 5-15 minutes breaks but it can happen
for about hour long breaks. There is no reliable way to reproduce the
problem.

4.14 with the same config (modulo any new config options) was working
fine.

Nothing in the log files afterwards. Network connection is WiFi. There
is a USB mouse connected.

Wat do I check next?

--
Meelis Roos (mroos@linux.ee)

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