[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 #19 from Thomas Fankhauser <tommy at southdesign.de> ---
I can reproduce this Bug with the exact same Hardware (XPS 9350 and DA200
Adapter) on Linux 4.4.3-1-ARCH.

After that I get the known skl Bug
(https://bugs.freedesktop.org/show_bug.cgi?id=89055):
WARNING: CPU: 0 PID: 448 at drivers/gpu/drm/i915/intel_pm.c:3597
skl_update_other_pipe_wm+0x1e7/0x1f0 [i915]()
CPU: 0 PID: 448 Comm: Xorg Tainted: G        W       4.4.3-1-ARCH #1
Hardware name: Dell Inc. XPS 13 9350/0PWNCR, BIOS 1.2.3 01/08/2016
0000000000000286 000000005f8fc51e ffff880274eb37c8 ffffffff812cac81
ffff880274eb3810 ffffffffa01c8fc8 ffff880274eb3800 ffffffff810776e2
ffff880275129000 ffff880274eb3934 ffff88027512a000 0000000000000000
Call Trace:
[<ffffffff812cac81>] dump_stack+0x63/0x82
[<ffffffff810776e2>] warn_slowpath_common+0x82/0xc0
[<ffffffff8107777c>] warn_slowpath_fmt+0x5c/0x80
[<ffffffffa00f9f47>] skl_update_other_pipe_wm+0x1e7/0x1f0 [i915]
[<ffffffffa00fa1aa>] skl_update_wm+0x25a/0x750 [i915]
[<ffffffff810e3130>] ? hrtimer_init+0x120/0x120
[<ffffffffa00fe4ee>] intel_update_watermarks+0x1e/0x30 [i915]
[<ffffffffa0163622>] intel_atomic_commit+0x462/0x1430 [i915]
[<ffffffffa00353ee>] ? drm_atomic_check_only+0x18e/0x590 [drm]
[<ffffffffa0035827>] drm_atomic_commit+0x37/0x60 [drm]
[<ffffffffa00a3fb6>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
[<ffffffffa0023ef2>] drm_mode_set_config_internal+0x62/0x100 [drm]
[<ffffffffa0028de2>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]

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