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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Intel HD 520 failed to train DP when connected with a external monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93578#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Intel HD 520 failed to train DP when connected with a external monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93578">bug 93578</a>
from <span class="vcard"><a class="email" href="mailto:Oliver.Deppert@gmail.com" title="Oliver Deppert <Oliver.Deppert@gmail.com>"> <span class="fn">Oliver Deppert</span></a>
</span></b>
<pre>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 ]---</pre>
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