[Bug 98282] [skl][bisected] GPU Hangs on nightly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98282

--- Comment #16 from Mike Lothian <mike at fireburn.co.uk> ---
I have a warning now:

[    1.186964] WARNING: CPU: 5 PID: 69 at drivers/gpu/drm/i915/intel_dp.c:4023
intel_dp_check_link_status+0x1a3/0x1d0
[    1.186964] WARN_ON_ONCE(!intel_dp->lane_count)
[    1.186964] Modules linked in:
[    1.186964] CPU: 5 PID: 69 Comm: kworker/u16:1 Tainted: G     U         
4.9.0-rc2-intel+ #124
[    1.186964] Hardware name: Alienware Alienware 15 R2/Alienware 15 R2, BIOS
1.3.6 08/05/2016
[    1.186964] Workqueue: events_unbound async_run_entry_fn
[    1.186964]  0000000000000000 ffffffff813548fc ffffc900035cfc88
0000000000000000
[    1.186964]  ffffffff8108f989 ffff8808a12840f0 ffffc900035cfcd8
ffff88089f4b0000
[    1.186964]  ffff88089f4b0258 ffff8808a12840f0 ffff8808a1284000
ffffffff8108f9fa
[    1.186964] Call Trace:
[    1.186964]  [<ffffffff813548fc>] ? dump_stack+0x46/0x5a
[    1.186964]  [<ffffffff8108f989>] ? __warn+0xb9/0xe0
[    1.186964]  [<ffffffff8108f9fa>] ? warn_slowpath_fmt+0x4a/0x50
[    1.186964]  [<ffffffff8145367b>] ? drm_dp_dpcd_read+0x4b/0x60
[    1.186964]  [<ffffffff815aefd3>] ? intel_dp_check_link_status+0x1a3/0x1d0
[    1.186964]  [<ffffffff815b4997>] ? intel_dp_detect+0x5f7/0x9e0
[    1.186964]  [<ffffffff814541c0>] ?
drm_helper_probe_single_connector_modes+0x400/0x4d0
[    1.186964]  [<ffffffff810bb572>] ? sched_clock_local+0x12/0x80
[    1.186964]  [<ffffffff81461897>] ? drm_fb_helper_initial_config+0x77/0x420
[    1.186964]  [<ffffffff810b2a18>] ? finish_task_switch+0x78/0x1d0
[    1.186964]  [<ffffffff815a686f>] ? intel_fbdev_initial_config+0xf/0x20
[    1.186964]  [<ffffffff810af4ed>] ? async_run_entry_fn+0x2d/0xd0
[    1.186964]  [<ffffffff810a769e>] ? process_one_work+0x1ee/0x490
[    1.186964]  [<ffffffff810a7982>] ? worker_thread+0x42/0x4c0
[    1.186964]  [<ffffffff810a7940>] ? process_one_work+0x490/0x490
[    1.186964]  [<ffffffff810acc19>] ? kthread+0xb9/0xd0
[    1.186964]  [<ffffffff810acb60>] ? kthread_park+0x50/0x50
[    1.186964]  [<ffffffff81087312>] ? ret_from_fork+0x22/0x30
[    1.186964] ---[ end trace aa2a2fb24b6f8b92 ]---

This is very early comnpared to where the freezes used to be, and now I don't
get any freezes

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