Split off from  issue 612522 . thorstenadmin@siemens.com's comment there was:

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Hi all, i've tested it on M52 BETA. If i just use the chromebook (CB) without citrix session it works as expected.

Setup:
HP 11" G4
external display via HDMI (lid open)
timeout sleep in admin console = 15 min

Whenever i do not touch the CB it goes into sleep and locks the session as expected. I've tested it several times.

Then:
1. I've started the citrix session and worked with my virtual client a couple of minutes.
2. Do nothing and wait for timeout

REsult:
CB does not go into sleep
After 15 minutes the CB session locks, but remains awake (no sleep)
Even after 30 min the CB did not go into sleep

After logging in again i've sent the Alt shift i logs (2:30 CET) user thorsten.bergmann@siemens.com

Will now log out, reboot and test again.

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Feedback report is http://feedback/product/208/neutron?lView=rd&lReport=12691190858 but seems to be missing powerd logs (I'm not sure why).

Here's what I wrote over email earlier:

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"The extended timeouts are intentional behavior -- see https://www.chromium.org/chromium-os/packages/power_manager/inactivity-delays:

"Several events can result in the above delays being lengthened (specifically, the screen-dimming delay is doubled and the other delays' distances from the dimming delay are maintained; for example, on battery, the delays are changed to 10/11/16 minutes):
* An external monitor is connected
* User activity occurs while the screen is dimmed or soon after it is turned off (delays are reset after the current user logs out)"

I suspect that both of these behaviors are being seen. I believe that the enterprise policies they should set if they want to prevent this are PresentationScreenDimDelayScale and UserActivityScreenDimDelayScale; the behavior can be disabled by setting both to 100."

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Issue 488091 may also be related.