What I see is similar, but not identical to Gábor's description:
Feb 24 14:51:10 tena kernel: [ 761.070735] CPU: 0 PID: 1132 Comm: Xorg
Tainted: G W 4.4.
0-64-generic #85~14.04.1-Ubuntu
Feb 24 14:51:10 tena kernel: [ 761.070736] Hardware name: Dell Inc. Latitude
E5570/0R3VX4, BIOS 1.7.3
06/15/2016
Feb 24 14:51:10 tena kernel: [ 761.070737] 0000000000000000 ffff880097f47928
ffffffff813dc80c ffff88
0097f47970
Feb 24 14:51:10 tena kernel: [ 761.070738] ffffffffc069e700 ffff880097f47960
ffffffff8107e9d6 ffff88
0097156000
Feb 24 14:51:10 tena kernel: [ 761.070739] ffff880097308000 0000000000000004
ffff880097cf8b78 ffff88
0097f479ec
Feb 24 14:51:10 tena kernel: [ 761.070741] Call Trace:
Feb 24 14:51:10 tena kernel: [ 761.070742] [<ffffffff813dc80c>]
dump_stack+0x63/0x87
Notice that in my case, it says "Xorg Tainted", where Gábor sees "Xorg Not
Tainted". Not sure if it's the same bug, but it sounds like it might be. I'm on
Ubuntu 14.04 ("4.4.0-64-generic #85~14.04.1-Ubuntu SMP Mon Feb 20 12:10:54 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux"), on a Latitude E5570. Fresh install a few
days ago.
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https://bugs.launchpad.net/bugs/1661763
Title:
screen turns off during standby, doesn't wake up on resume
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