[Bug 73694] [hsw DP] Ubuntu 12.04 unable to use external monitor through edock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73694

--- Comment #33 from Jonathan McDowell <noodles at earth.li> ---
I'm also seeing the attached - would adding the debug from i915.mmio_debug be
helpful? Eventually I see a whole cascade of the slowpath warnings such that
the way to recover seems to be a reboot, but as far as I can tell this only
happens when the laptop is docked (external monitor still not working, but it's
handy for power + usb devices).

Oct 16 19:53:00 mixian kernel: [  239.611414]
[drm:hsw_unclaimed_reg_detect.isra.11] *ERROR* Unclaimed register detected.
Please use the i915.mmio_debug=1 to debug this problem.
Oct 16 19:53:00 mixian kernel: [  239.611414] ------------[ cut here
]------------
Oct 16 19:53:00 mixian kernel: [  239.611422] WARNING: CPU: 0 PID: 378 at
drivers/gpu/drm/i915/intel_runtime_pm.c:675
intel_display_power_put+0x14c/0x160()
Oct 16 19:53:00 mixian kernel: [  239.611495] Modules linked in: ctr ccm
binfmt_misc bnep nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc
arc4 qmi_wwan cdc_wdm joydev us
bnet mii iwlmvm mac80211 qcserial usb_wwan usbserial uvcvideo videobuf2_vmalloc
videobuf2_memops videobuf2_core hid_multitouch v4l2_common ecb videodev media
iwlwifi cfg80211 btusb blu
etooth psmouse serio_raw x86_pkg_temp_thermal intel_powerclamp pcspkr
snd_hda_codec_hdmi tpm_tis snd_hda_codec_realtek tpm i2c_i801
snd_hda_codec_generic snd_hda_intel snd_hda_controll
er evdev snd_hda_codec snd_hwdep snd_pcm snd_timer battery processor ac fuse
autofs4 algif_skcipher af_alg hid_generic usbhid crct10dif_pclmul crc32_pclmul
crc32c_intel ghash_clmulni_i
ntel sg ehci_pci sdhci_pci ehci_hcd xhci_hcd usbcore usb_common thermal i2c_hid
hid sdhci_acpi sdhci mmc_core
Oct 16 19:53:00 mixian kernel: [  239.611501] CPU: 0 PID: 378 Comm: kworker/0:4
Not tainted 3.17.0+ #6
Oct 16 19:53:00 mixian kernel: [  239.611502] Hardware name: Dell Inc. Latitude
E7240/0V120R, BIOS A08 02/18/2014
Oct 16 19:53:00 mixian kernel: [  239.611508] Workqueue: events
edp_panel_vdd_work
Oct 16 19:53:00 mixian kernel: [  239.611514]  0000000000000009
ffffffff8166d071 0000000000000000 ffffffff810a8152
Oct 16 19:53:00 mixian kernel: [  239.611518]  ffff8804085a002c
ffff8804085a8838 ffff88041ea12780 0000000000000000
Oct 16 19:53:00 mixian kernel: [  239.611521]  ffff8804085a0000
ffffffff81412bfc ffff880409fb2508 ffff88040949ee80
Oct 16 19:53:00 mixian kernel: [  239.611522] Call Trace:
Oct 16 19:53:00 mixian kernel: [  239.611528]  [<ffffffff8166d071>] ?
dump_stack+0x41/0x51
Oct 16 19:53:00 mixian kernel: [  239.611533]  [<ffffffff810a8152>] ?
warn_slowpath_common+0x72/0x90
Oct 16 19:53:00 mixian kernel: [  239.611536]  [<ffffffff81412bfc>] ?
intel_display_power_put+0x14c/0x160
Oct 16 19:53:00 mixian kernel: [  239.611541]  [<ffffffff810be142>] ?
process_one_work+0x142/0x3e0
Oct 16 19:53:00 mixian kernel: [  239.611544]  [<ffffffff810be6b3>] ?
worker_thread+0x63/0x480
Oct 16 19:53:00 mixian kernel: [  239.611546]  [<ffffffff810be650>] ?
rescuer_thread+0x270/0x270
Oct 16 19:53:00 mixian kernel: [  239.611551]  [<ffffffff810c2c0a>] ?
kthread+0xca/0xe0
Oct 16 19:53:00 mixian kernel: [  239.611555]  [<ffffffff810c2b40>] ?
kthread_create_on_node+0x180/0x180
Oct 16 19:53:00 mixian kernel: [  239.611559]  [<ffffffff816736ec>] ?
ret_from_fork+0x7c/0xb0
Oct 16 19:53:00 mixian kernel: [  239.611563]  [<ffffffff810c2b40>] ?
kthread_create_on_node+0x180/0x180
Oct 16 19:53:00 mixian kernel: [  239.611565] ---[ end trace d31a378ee49c147f
]---
Oct 16 19:53:00 mixian kernel: [  239.611566] ------------[ cut here
]------------

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