[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 #35 from Jonathan McDowell <noodles at earth.li> ---


[  119.561399] ------------[ cut here ]------------
[  119.561408] WARNING: CPU: 0 PID: 4 at
drivers/gpu/drm/i915/intel_uncore.c:525 hsw_unclaimed_reg_debug+0x65/0x80()
[  119.561410] Unclaimed register detected before reading register 0xc7204
[  119.561465] Modules linked in: ctr ccm binfmt_misc bnep nfsd auth_rpcgss
oid_registry nfs_acl nfs lockd fscache sunrpc arc4 qmi_wwan cdc_wdm usbnet mii
joydev snd_hda_codec_realtek qcserial snd_hda_codec_generic usb_wwan usbserial
iwlmvm mac80211 snd_hda_codec_hdmi ecb x86_pkg_temp_thermal intel_powerclamp
iwlwifi pcspkr psmouse btusb serio_raw bluetooth i2c_i801 hid_multitouch
snd_hda_intel snd_hda_controller snd_hda_codec cfg80211 snd_hwdep snd_pcm
snd_timer tpm_tis tpm evdev processor battery ac fuse autofs4 algif_skcipher
af_alg hid_generic usbhid crct10dif_pclmul crc32_pclmul crc32c_intel
ghash_clmulni_intel sg sdhci_pci ehci_pci ehci_hcd xhci_hcd usbcore usb_common
thermal sdhci_acpi sdhci i2c_hid mmc_core hid
[  119.561469] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 3.17.0+ #6
[  119.561470] Hardware name: Dell Inc. Latitude E7240/0V120R, BIOS A08
02/18/2014
[  119.561475] Workqueue: events edp_panel_vdd_work
[  119.561479]  0000000000000009 ffffffff8166d071 ffff88040a19fd28
ffffffff810a8152
[  119.561482]  ffff880408580000 ffff88040a19fd78 ffff88041ea12780
ffff880408580068
[  119.561485]  0000000000000246 ffffffff810a81b7 ffffffff819be048
ffffffff00000030
[  119.561486] Call Trace:
[  119.561493]  [<ffffffff8166d071>] ? dump_stack+0x41/0x51
[  119.561498]  [<ffffffff810a8152>] ? warn_slowpath_common+0x72/0x90
[  119.561501]  [<ffffffff810a81b7>] ? warn_slowpath_fmt+0x47/0x50
[  119.561507]  [<ffffffff81187c1d>] ? next_online_pgdat+0x1d/0x50
[  119.561510]  [<ffffffff81447115>] ? hsw_unclaimed_reg_debug+0x65/0x80
[  119.561513]  [<ffffffff814498ce>] ? gen6_read32+0x4e/0x130
[  119.561516]  [<ffffffff81449880>] ? gen6_read8+0x130/0x130
[  119.561519]  [<ffffffff8147a224>] ? edp_have_panel_vdd+0x34/0x40
[  119.561522]  [<ffffffff8147abed>] ? edp_panel_vdd_off_sync+0x2d/0x1b0
[  119.561525]  [<ffffffff8147ad95>] ? edp_panel_vdd_work+0x25/0x30
[  119.561529]  [<ffffffff810be142>] ? process_one_work+0x142/0x3e0
[  119.561532]  [<ffffffff810be6b3>] ? worker_thread+0x63/0x480
[  119.561535]  [<ffffffff810be650>] ? rescuer_thread+0x270/0x270
[  119.561540]  [<ffffffff810c2c0a>] ? kthread+0xca/0xe0
[  119.561544]  [<ffffffff810c2b40>] ? kthread_create_on_node+0x180/0x180
[  119.561549]  [<ffffffff816736ec>] ? ret_from_fork+0x7c/0xb0
[  119.561553]  [<ffffffff810c2b40>] ? kthread_create_on_node+0x180/0x180
[  119.561555] ---[ end trace d3b671e0e63801ff ]---
[  119.561561] ------------[ cut here ]------------

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