(In reply to Robert Ancell from comment #1)
> We are currently working around this issue in Ubuntu 15.04 by reverting that
> one commmit.
That one commit being
commit 7d9a74622e5a936e4860fcef8358619bf59adae8
Author: Chris Wilson <email address hidden>
Date: Mon Jun 15 14:16:34 2015 +0100
sna: Be robust in handling DPMS failures
i.e. not a kernel commit. Apparently Chris' conclusion was that the
kernel returns an error on DPMS.
Please attach dmesg with drm.debug=14 module parameter, all the way from
boot to reproducing the problem.
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https://bugs.launchpad.net/bugs/1501941
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Screen turned off after X server exits
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