[Bug 93578] Intel HD 520 failed to train DP when connected with a external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93578

--- Comment #15 from Oliver Deppert <Oliver.Deppert at gmail.com> ---
Hi,

just some additional test: Booting the notebook with a monitor attached to the
"internal" HDMI port (DLA was detached) raises same kernel errors:

[    1.811830] ------------[ cut here ]------------
[    1.811834] WARNING: CPU: 0 PID: 42 at drivers/gpu/drm/i915/intel_pm.c:3597
skl_update_other_pipe_wm+0x168/0x170()
[    1.811834] WARN_ON(!wm_changed)
[    1.811835] Modules linked in:
[    1.811836] CPU: 0 PID: 42 Comm: kworker/0:1 Not tainted 4.4.0-gentoo-r1 #21
[    1.811836] Hardware name: Dell Inc. XPS 15 9550/0N7TVV, BIOS 01.01.19
01/25/2016
[    1.811838] Workqueue: events output_poll_execute
[    1.811839]  ffffffff81abf5f0 ffffffff81378883 ffff8804bdbf78b0
ffffffff810867a7
[    1.811840]  ffff8804af003000 ffff8804bdbf7900 ffff8804ae4dc000
0000000000000000
[    1.811841]  ffff8804ae56a378 ffffffff81086827 ffffffff81af8724
ffff880400000020
[    1.811841] Call Trace:
[    1.811843]  [<ffffffff81378883>] ? dump_stack+0x40/0x5d
[    1.811845]  [<ffffffff810867a7>] ? warn_slowpath_common+0x77/0xb0
[    1.811846]  [<ffffffff81086827>] ? warn_slowpath_fmt+0x47/0x50
[    1.811847]  [<ffffffff81482588>] ? skl_update_other_pipe_wm+0x168/0x170
[    1.811849]  [<ffffffff8148276e>] ? skl_update_wm+0x1de/0x660
[    1.811850]  [<ffffffff814bcbb2>] ? gen9_read32+0x112/0x280
[    1.811850]  [<ffffffff814bd230>] ? gen9_write8+0x290/0x290
[    1.811852]  [<ffffffff814dfb29>] ? haswell_crtc_enable+0x369/0x880
[    1.811853]  [<ffffffff814db985>] ? intel_atomic_commit+0x365/0x1290
[    1.811855]  [<ffffffff8144b21f>] ?
drm_atomic_helper_check_planes+0x12f/0x1a0
[    1.811856]  [<ffffffff8146c03d>] ?
drm_atomic_add_affected_connectors+0x1d/0xe0
[    1.811857]  [<ffffffff8144f5e0>] ?
drm_fb_helper_restore_fbdev_mode_unlocked+0x270/0x2a0
[    1.811858]  [<ffffffff8144f634>] ? drm_fb_helper_set_par+0x24/0x50
[    1.811859]  [<ffffffff8144f327>] ? drm_fb_helper_hotplug_event+0x97/0xe0
[    1.811860]  [<ffffffff81444578>] ? output_poll_execute+0x188/0x1d0
[    1.811862]  [<ffffffff81099c85>] ? process_one_work+0x135/0x350
[    1.811863]  [<ffffffff8109a2e5>] ? worker_thread+0x45/0x430
[    1.811864]  [<ffffffff8109a2a0>] ? max_active_store+0x50/0x50
[    1.811865]  [<ffffffff8109e808>] ? kthread+0xb8/0xd0
[    1.811866]  [<ffffffff8109e750>] ? kthread_park+0x50/0x50
[    1.811868]  [<ffffffff818b5a1f>] ? ret_from_fork+0x3f/0x70
[    1.811869]  [<ffffffff8109e750>] ? kthread_park+0x50/0x50
[    1.811869] ---[ end trace 630fc1874be125e2 ]---

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