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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#c31">Comment # 31</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:andraz.tori@gmail.com" title="Andraz Tori <andraz.tori@gmail.com>"> <span class="fn">Andraz Tori</span></a>
</span></b>
        <pre>Tested on 4.6.0-040600rc4-generic. The problem persists.

Thinkpad X260 with HDMI port connected.

Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888429] ------------[ cut
here ]------------
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888453] WARNING: CPU: 1
PID: 6 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_pm.c:3572
skl_update_other_pipe_wm+0x16c/0x180 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888454]
WARN_ON(!wm_changed)
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888459] Modules linked in:
hid_generic usbhid hid rtsx_pci_sdmmc i915 psmouse e1000e i2c_algo_bit ptp
drm_kms_helper pps_core ahci rtsx_pci libahci syscopyarea sysfillrect sysimgblt
fb_sys_fops drm wmi video fjes
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888461] CPU: 1 PID: 6 Comm:
kworker/u16:0 Not tainted 4.6.0-040600rc4-generic #201604172330
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888461] Hardware name:
LENOVO 20F5S0AU00/20F5S0AU00, BIOS R02ET44W (1.17 ) 01/25/2016
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888464] Workqueue:
events_unbound async_run_entry_fn
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888466]  0000000000000286
000000000acf348e ffff88042ea83610 ffffffff813eee03
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888467]  ffff88042ea83660
0000000000000000 ffff88042ea83650 ffffffff810827cb
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888468]  00000df401b6348e
ffff880428ded000 ffff880427cf9da4 ffff880428dec000
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888468] Call Trace:
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888471] 
[<ffffffff813eee03>] dump_stack+0x63/0x90
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888473] 
[<ffffffff810827cb>] __warn+0xcb/0xf0
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888474] 
[<ffffffff8108284f>] warn_slowpath_fmt+0x5f/0x80
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888490] 
[<ffffffffc01c95ec>] skl_update_other_pipe_wm+0x16c/0x180 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888503] 
[<ffffffffc01c9785>] skl_update_wm+0x185/0x640 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888523] 
[<ffffffffc0217345>] ? gen9_write32+0x235/0x370 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888545] 
[<ffffffffc025576f>] ? intel_ddi_enable_transcoder_func+0x17f/0x260 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888560] 
[<ffffffffc01cd54e>] intel_update_watermarks+0x1e/0x30 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888579] 
[<ffffffffc02396f1>] haswell_crtc_enable+0x321/0x8c0 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888597] 
[<ffffffffc0225cee>] ? intel_finish_crtc_commit+0xe/0x10 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888603] 
[<ffffffffc01068d4>] ? drm_atomic_helper_commit_planes_on_crtc+0x154/0x270
[drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888620] 
[<ffffffffc0236080>] intel_atomic_commit+0x5e0/0xdc0 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888633] 
[<ffffffffc005cc31>] ? drm_atomic_check_only+0x181/0x600 [drm]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888643] 
[<ffffffffc005d0e7>] drm_atomic_commit+0x37/0x60 [drm]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888648] 
[<ffffffffc0107b1f>] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888657] 
[<ffffffffc005bd6a>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888661] 
[<ffffffffc0109d43>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80
[drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888664] 
[<ffffffffc0109dbd>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888667] 
[<ffffffffc0109cc2>] drm_fb_helper_hotplug_event+0xd2/0x120 [drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888670] 
[<ffffffffc0109d66>] drm_fb_helper_restore_fbdev_mode_unlocked+0x56/0x80
[drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888673] 
[<ffffffffc0109dbd>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888693] 
[<ffffffffc024bd6a>] intel_fbdev_set_par+0x1a/0x60 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888694] 
[<ffffffff8146ed20>] fbcon_init+0x570/0x5f0
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888696] 
[<ffffffff8150167a>] visual_init+0xca/0x130
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888698] 
[<ffffffff81502fb1>] do_bind_con_driver+0x1c1/0x3a0
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888699] 
[<ffffffff815034c9>] do_take_over_console+0x149/0x1a0
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888701] 
[<ffffffff8146ab87>] do_fbcon_takeover+0x57/0xb0
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888702] 
[<ffffffff8146f798>] fbcon_event_notify+0x658/0x750
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888703] 
[<ffffffff810a407a>] notifier_call_chain+0x4a/0x70
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888705] 
[<ffffffff810a43b7>] __blocking_notifier_call_chain+0x47/0x60
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888706] 
[<ffffffff810a43e6>] blocking_notifier_call_chain+0x16/0x20
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888707] 
[<ffffffff8147559b>] fb_notifier_call_chain+0x1b/0x20
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888708] 
[<ffffffff814775a3>] register_framebuffer+0x213/0x370
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888712] 
[<ffffffffc010a06a>] drm_fb_helper_initial_config+0x28a/0x420 [drm_kms_helper]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888729] 
[<ffffffffc024c91f>] intel_fbdev_initial_config+0x1f/0x30 [i915]
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888731] 
[<ffffffff810a5bd8>] async_run_entry_fn+0x48/0x150
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888732] 
[<ffffffff8109ca25>] process_one_work+0x165/0x480
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888734] 
[<ffffffff8109cd8b>] worker_thread+0x4b/0x500
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888735] 
[<ffffffff8109cd40>] ? process_one_work+0x480/0x480
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888736] 
[<ffffffff810a3178>] kthread+0xd8/0xf0
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888738] 
[<ffffffff8183fb62>] ret_from_fork+0x22/0x40
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888739] 
[<ffffffff810a30a0>] ? kthread_create_on_node+0x1a0/0x1a0
Apr 18 21:55:26 minmax-ThinkPad-X260 kernel: [    2.888740] ---[ end trace
e03767ef15b72de7 ]---</pre>
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