I think I am having the same problem on Thinkpad x260. It hangs up
during suspend and last message in syslog is:

Mar 19 22:58:26 periplum kernel: [   29.322099] CPU: 1 PID: 843 Comm: Xorg 
Tainted: G        W       4.2.0-34-generic #39-Ubuntu
Mar 19 22:58:26 periplum kernel: [   29.322100] Hardware name: LENOVO 
20F5S13Q00/20F5S13Q00, BIOS R02ET43W (1.16 ) 01/05/2016
Mar 19 22:58:26 periplum kernel: [   29.322101]  0000000000000000 
00000000074d7529 ffff88042804ba58 ffffffff817ebed3
Mar 19 22:58:26 periplum kernel: [   29.322104]  0000000000000000 
ffff88042804bab0 ffff88042804ba98 ffffffff8107b986
Mar 19 22:58:26 periplum kernel: [   29.322107]  ffff88042804bad8 
ffff880426c00000 0000000040000000 ffffffffc025a7d0
Mar 19 22:58:26 periplum kernel: [   29.322109] Call Trace:
Mar 19 22:58:26 periplum kernel: [   29.322112]  [<ffffffff817ebed3>] 
dump_stack+0x45/0x57
Mar 19 22:58:26 periplum kernel: [   29.322116]  [<ffffffff8107b986>] 
warn_slowpath_common+0x86/0xc0
Mar 19 22:58:26 periplum kernel: [   29.322119]  [<ffffffff8107ba15>] 
warn_slowpath_fmt+0x55/0x70
Mar 19 22:58:26 periplum kernel: [   29.322131]  [<ffffffffc01837a0>] 
skl_set_power_well+0x790/0x990 [i915]
Mar 19 22:58:26 periplum kernel: [   29.322143]  [<ffffffffc01839d3>] 
skl_power_well_enable+0x13/0x20 [i915]
Mar 19 22:58:26 periplum kernel: [   29.322155]  [<ffffffffc0183c58>] 
intel_display_power_get+0x98/0xf0 [i915]
Mar 19 22:58:26 periplum kernel: [   29.322176]  [<ffffffffc021100c>] 
intel_hdmi_set_edid+0x3c/0xf0 [i915]
Mar 19 22:58:26 periplum kernel: [   29.322196]  [<ffffffffc02111b5>] 
intel_hdmi_detect+0x55/0xb0 [i915]
Mar 19 22:58:26 periplum kernel: [   29.322202]  [<ffffffffc00a0af5>] 
drm_helper_probe_single_connector_modes_merge_bits+0x235/0x4d0 [drm_kms_helper]
Mar 19 22:58:26 periplum kernel: [   29.322205]  [<ffffffff8101dcd9>] ? 
read_tsc+0x9/0x10
Mar 19 22:58:26 periplum kernel: [   29.322210]  [<ffffffffc00a0da3>] 
drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
Mar 19 22:58:26 periplum kernel: [   29.322225]  [<ffffffffc0038281>] 
drm_mode_getconnector+0x331/0x390 [drm]
Mar 19 22:58:26 periplum kernel: [   29.322235]  [<ffffffffc0029505>] 
drm_ioctl+0x125/0x610 [drm]
Mar 19 22:58:26 periplum kernel: [   29.322238]  [<ffffffff810885a1>] ? 
__set_task_blocked+0x41/0xa0
Mar 19 22:58:26 periplum kernel: [   29.322251]  [<ffffffffc0037f50>] ? 
drm_mode_getcrtc+0x150/0x150 [drm]
Mar 19 22:58:26 periplum kernel: [   29.322255]  [<ffffffff81211375>] 
do_vfs_ioctl+0x295/0x480
Mar 19 22:58:26 periplum kernel: [   29.322258]  [<ffffffff810216ed>] ? 
fpu__restore_sig+0x4d/0x60
Mar 19 22:58:26 periplum kernel: [   29.322261]  [<ffffffff812115d9>] 
SyS_ioctl+0x79/0x90
Mar 19 22:58:26 periplum kernel: [   29.322265]  [<ffffffff81015088>] ? 
sys_rt_sigreturn+0xc8/0xe0
Mar 19 22:58:26 periplum kernel: [   29.322267]  [<ffffffff817f2cf2>] 
entry_SYSCALL_64_fastpath+0x16/0x75
Mar 19 22:58:26 periplum kernel: [   29.322269] ---[ end trace 9092ca935c821d77 
]---

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https://bugs.launchpad.net/bugs/1384297

Title:
  After system resume, Intel i915 graphics hangs

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