Apparently it's the i915 kernel module that fails when the system
suspends (as per the dmesg in nvidia-bug-report.log.gz):
[ 347.094378] ------------[ cut here ]------------
[ 347.094404] WARNING: CPU: 5 PID: 2858 at
/build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_uncore.c:125
gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]()
[ 347.094404] MMIO read or write has been dropped ffffffff
.....
[ 347.094428] CPU: 5 PID: 2858 Comm: kworker/u16:13 Tainted: PF O
3.13.0-7-generic #25-Ubuntu
[ 347.094429] Hardware name: LENOVO 2099/INVALID, BIOS 5DCN89WW(V8.00)
08/23/2012
[ 347.094438] Workqueue: i915 gen6_force_wake_work [i915]
[ 347.094440] 0000000000000009 ffff88020e8a1d38 ffffffff817095d7
ffff88020e8a1d80
[ 347.094442] ffff88020e8a1d70 ffffffff8106467d ffff8800b709c020
ffff8800b709c028
[ 347.094443] 0000000000000246 0000000000000000 0000000000000200
ffff88020e8a1dd0
[ 347.094444] Call Trace:
[ 347.094448] [<ffffffff817095d7>] dump_stack+0x45/0x56
[ 347.094451] [<ffffffff8106467d>] warn_slowpath_common+0x7d/0xa0
[ 347.094452] [<ffffffff810646ec>] warn_slowpath_fmt+0x4c/0x50
[ 347.094462] [<ffffffffa0c6dd08>] gen6_gt_check_fifodbg.isra.9+0x38/0x50
[i915]
[ 347.094469] [<ffffffffa0c6ddab>] __gen6_gt_force_wake_mt_put+0x2b/0x30
[i915]
[ 347.094477] [<ffffffffa0c6dad7>] gen6_force_wake_work+0x37/0x50 [i915]
[ 347.094479] [<ffffffff81080872>] process_one_work+0x182/0x450
[ 347.094481] [<ffffffff81081611>] worker_thread+0x121/0x410
[ 347.094482] [<ffffffff810814f0>] ? rescuer_thread+0x3e0/0x3e0
[ 347.094484] [<ffffffff81088262>] kthread+0xd2/0xf0
[ 347.094485] [<ffffffff81088190>] ? kthread_create_on_node+0x190/0x190
[ 347.094488] [<ffffffff81719efc>] ret_from_fork+0x7c/0xb0
[ 347.094489] [<ffffffff81088190>] ? kthread_create_on_node+0x190/0x190
[ 347.094490] ---[ end trace c5385131fcc61d31 ]---
[ 347.943633] PM: suspend of devices complete after 986.296 msecs
[ 347.943778] PM: late suspend of devices complete after 0.143 msecs
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1276674
Title:
Suspend works flawlessly however resume leads to a checker board
screen rather that lightdm
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