[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 #22 from Oliver Deppert <Oliver.Deppert at gmail.com> ---
Hi,

unfortunately not...same problems with latest 4.5.0 kernel....output on DLA200
only possible with 30Hz; Kernel trace as soon as HDMI monitor is switched on

[  327.197593] ------------[ cut here ]------------
[  327.197599] WARNING: CPU: 0 PID: 4160 at
drivers/gpu/drm/i915/intel_pm.c:3553 skl_update_other_pipe_wm+0x103/0x110()
[  327.197600] WARN_ON(!wm_changed)
[  327.197601] Modules linked in:
[  327.197602]  fuse vboxnetadp(O) vboxnetflt(O) vboxdrv(O) uinput
hid_roccat_koneplus hid_roccat hid_roccat_common kvm_intel kvm irqbypass
uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videodev
videobuf2_core nvidia(PO)
[  327.197620] CPU: 0 PID: 4160 Comm: X Tainted: P        W  O    4.5.0-gentoo
#1
[  327.197622] Hardware name: Dell Inc. XPS 15 9550/0N7TVV, BIOS 01.01.19
01/25/2016
[  327.197623]  0000000000000000 ffffffff8137d8a9 ffff8804a1cf3a20
ffffffff81adc5a0
[  327.197625]  ffffffff81087f07 ffff8804af24d000 ffff8804a1cf3a70
ffff8804ae31995c
[  327.197627]  ffff8804ae2dfba8 ffff8804ae2a2000 ffffffff81087f87
ffffffff81ab80d6
[  327.197629] Call Trace:
[  327.197634]  [<ffffffff8137d8a9>] ? dump_stack+0x46/0x5d
[  327.197636]  [<ffffffff81087f07>] ? warn_slowpath_common+0x77/0xb0
[  327.197638]  [<ffffffff81087f87>] ? warn_slowpath_fmt+0x47/0x50
[  327.197640]  [<ffffffff814948c3>] ? skl_update_other_pipe_wm+0x103/0x110
[  327.197642]  [<ffffffff81494a09>] ? skl_update_wm+0x139/0x5c0
[  327.197645]  [<ffffffff8150eba9>] ?
intel_ddi_enable_transcoder_func+0x169/0x230
[  327.197646]  [<ffffffff814f3e63>] ? haswell_crtc_enable+0x303/0x880
[  327.197648]  [<ffffffff814ef98e>] ? intel_atomic_commit+0x5de/0x1650
[  327.197651]  [<ffffffff8147dc9c>] ?
drm_atomic_set_crtc_for_connector+0x4c/0xd0
[  327.197653]  [<ffffffff8145ef2d>] ? drm_atomic_helper_set_config+0x6d/0xa0
[  327.197655]  [<ffffffff8146f779>] ? drm_mode_set_config_internal+0x59/0xf0
[  327.197658]  [<ffffffff814738dd>] ? drm_mode_setcrtc+0x17d/0x4e0
[  327.197660]  [<ffffffff814667ae>] ? drm_ioctl+0x10e/0x460
[  327.197662]  [<ffffffff81473760>] ? drm_mode_setplane+0x1b0/0x1b0
[  327.197664]  [<ffffffff8116f6c4>] ? do_vfs_ioctl+0x84/0x590
[  327.197667]  [<ffffffff8115df11>] ? vfs_write+0x151/0x180
[  327.197669]  [<ffffffff8116fc41>] ? SyS_ioctl+0x71/0x80
[  327.197671]  [<ffffffff818b5997>] ? entry_SYSCALL_64_fastpath+0x12/0x6a
[  327.197680] ---[ end trace 3fa9d775dcbfdd15 ]---
[  329.661896] [drm:gen8_irq_handler] *ERROR* CPU pipe C FIFO underrun

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