[Bug 69251] [DP] Getting kernel WARN every time I disconnect a DisplayPort monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69251

--- Comment #16 from Leho Kraav (:macmaN :lkraav) <leho at kraav.com> ---
I'm experiencing this with 3.16.1.

aug   31 15:46:00 xps14 kernel: ------------[ cut here ]------------
aug   31 15:46:00 xps14 kernel: WARNING: CPU: 2 PID: 5938 at
drivers/gpu/drm/i915/intel_dp.c:3122 intel_dp_link_down+0x53/0x1cb [i915]()
aug   31 15:46:00 xps14 kernel: Modules linked in: nfsv3 nfs_acl nfs lockd
sunrpc snd_usb_audio snd_usbmidi_lib snd_hwdep snd_rawmidi snd_seq_device msr
cpufreq_stats tun ctr ccm btusb bnep b
aug   31 15:46:00 xps14 kernel:  processor snd crc32_pclmul i915 fbcon bitblit
softcursor cfbfillrect font cfbimgblt intel_gtt cfbcopyarea drm_kms_helper drm
ehci_pci agpgart ehci_hcd fb xhci
aug   31 15:46:00 xps14 kernel: CPU: 2 PID: 5938 Comm: Xorg Tainted: G        W
    3.16.1 #37
aug   31 15:46:00 xps14 kernel: Hardware name: Dell Inc. Latitude E7440/0PPXP5,
BIOS A08 02/18/2014
aug   31 15:46:00 xps14 kernel:  0000000000000009 ffff8800bb687988
ffffffff8147b2c7 0000000000000006
aug   31 15:46:00 xps14 kernel:  0000000000000000 ffff8800bb6879c8
ffffffff81038df3 0000000000000006
aug   31 15:46:00 xps14 kernel:  ffffffffa0149dd4 ffff880405910000
ffff88040694d8d8 ffff88040694f000
aug   31 15:46:00 xps14 kernel: Call Trace:
aug   31 15:46:00 xps14 kernel:  [<ffffffff8147b2c7>] dump_stack+0x4e/0x71
aug   31 15:46:00 xps14 kernel:  [<ffffffff81038df3>]
warn_slowpath_common+0x7c/0x96
aug   31 15:46:00 xps14 kernel:  [<ffffffffa0149dd4>] ?
intel_dp_link_down+0x53/0x1cb [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffff81038e22>]
warn_slowpath_null+0x15/0x17
aug   31 15:46:00 xps14 kernel:  [<ffffffffa0149dd4>]
intel_dp_link_down+0x53/0x1cb [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa014e5a3>]
intel_dp_complete_link_train+0x107/0x296 [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa0147e56>]
intel_ddi_pre_enable+0x124/0x164 [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa0134639>]
haswell_crtc_enable+0x4b0/0x8ef [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa0148af2>] ?
intel_ddi_pll_select+0x41/0x2b0 [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa0137595>]
__intel_set_mode+0x10d7/0x11dd [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa013954b>] intel_set_mode+0x11/0x2a
[i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa013a18f>]
intel_crtc_set_config+0x710/0xa0f [i915]
aug   31 15:46:00 xps14 kernel:  [<ffffffff8126de4e>] ? idr_alloc+0x91/0xb9
aug   31 15:46:00 xps14 kernel:  [<ffffffffa00728d6>]
drm_mode_set_config_internal+0x4e/0xba [drm]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa0075882>]
drm_mode_setcrtc+0x3da/0x484 [drm]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa00690d5>] drm_ioctl+0x2b3/0x414
[drm]
aug   31 15:46:00 xps14 kernel:  [<ffffffffa00754a8>] ?
drm_mode_setplane+0x39f/0x39f [drm]
aug   31 15:46:00 xps14 kernel:  [<ffffffff8111f214>] do_vfs_ioctl+0x3f9/0x443
aug   31 15:46:00 xps14 kernel:  [<ffffffff81110b06>] ? vfs_write+0x134/0x195
aug   31 15:46:00 xps14 kernel:  [<ffffffff8111f297>] SyS_ioctl+0x39/0x62
aug   31 15:46:00 xps14 kernel:  [<ffffffff814805d2>]
system_call_fastpath+0x16/0x1b
aug   31 15:46:00 xps14 kernel: ---[ end trace 22887e7bb10acd1a ]---
aug   31 15:46:00 xps14 kernel: [drm:intel_dp_complete_link_train] *ERROR*
failed to train DP, aborting

Even though hostname says xps14, it's actually the E7440, as the trace also
says in Hardware name.

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