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Lenovo T420 delays suspend to RAM in stretch (with activated wifi), regression



Hi,
 
I would like to help fixing a possible regression in stretch. With activated wifi-network there is an aproximately 5 seconds delay when going to suspend (to RAM) (FN-F4 key or Cinnamon-menu).
 
With disabled wifi there is instant suspend beahaviour. In wheezy there was no delay with suspend with activated wifi.
 
Any ideas e.g. which information is required for a bug report and which package should be adressed?
 
I had this behaviour as well with an older kernel (4.4? in stretch)
 
wifi is (iwlwifi-6000-4.ucode)
 
Steps:
invoke suspend (FN-F4 key or Cinnamon-menu)
instant: screensaver
5 second delay in which even a unlock (relogin) is possible.
suspend established
 
Yours, happy new year
 
lopiuh
 
-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 4.8.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages firmware-linux-nonfree depends on:
ii  firmware-amd-graphics  20161130-2
ii  firmware-misc-nonfree  20161130-2
Versions of packages firmware-linux-nonfree recommends:
ii  amd64-microcode  3.20160316.3
ii  intel-microcode  3.20161104.1
firmware-linux-nonfree suggests no packages.
-- no debconf information

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