[utopic] [drm] HPD interrupt storm detected on connector DP-1: switching from hotplug detection to polling

[Chris Cheney]

This is essentially the same issue as bug #1360545 but on utopic. On utopic there are also some kernel backtraces as shown below. The system was completely unresponsive and I had to actually unplug the displayport dongle to be able to file this bug report.

In addition to the interrupt storm message I got on trusty I also saw:

[ 3.713503] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared fifo underrun on pipe C
[ 3.713536] [drm:ivb_err_int_handler] *ERROR* Pipe C FIFO underrun

The numerous backtraces looked similar to this each time, they appear to be happening about 3 times per second until I unplugged the dongle.

[ 3.721942] ------------[ cut here ]------------
[ 3.721959] WARNING: CPU: 0 PID: 83 at /build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_dp.c:3122 intel_dp_link_down+0x1a9/0x230 [i915]()
[ 3.721960] Modules linked in: mxm_wmi i915 igb psmouse e1000e firewire_ohci drm_kms_helper dca firewire_core drm ahci ptp crc_itu_t i2c_algo_bit libahci pps_core wmi video
[ 3.721969] CPU: 0 PID: 83 Comm: kworker/0:1 Not tainted 3.16.0-10-generic #15-Ubuntu
[ 3.721970] Hardware name: Gigabyte Technology Co., Ltd. Z87X-UD5H/Z87X-UD5H-CF, BIOS 10c 06/12/2014
[ 3.721978] Workqueue: events i915_hotplug_work_func [i915]
[ 3.721979] 0000000000000009 ffff8807ee2f7c88 ffffffff82777e9f 0000000000000000
[ 3.721981] ffff8807ee2f7cc0 ffffffff8206fced ffff8807e8b20000 0000000080000002
[ 3.721983] ffff8807ee642800 0000000000000003 ffff8807ee6460d8 ffff8807ee2f7cd0
[ 3.721984] Call Trace:
[ 3.721989] [<ffffffff82777e9f>] dump_stack+0x45/0x56
[ 3.721991] [<ffffffff8206fced>] warn_slowpath_common+0x7d/0xa0
[ 3.721993] [<ffffffff8206fdca>] warn_slowpath_null+0x1a/0x20
[ 3.722002] [<ffffffffc028f069>] intel_dp_link_down+0x1a9/0x230 [i915]
[ 3.722011] [<ffffffffc0294505>] intel_dp_complete_link_train+0x105/0x390 [i915]
[ 3.722020] [<ffffffffc0294da8>] intel_dp_check_link_status+0xb8/0x1b0 [i915]
[ 3.722028] [<ffffffffc028ba98>] intel_ddi_hot_plug+0x28/0x30 [i915]
[ 3.722035] [<ffffffffc0251f74>] i915_hotplug_work_func+0x1f4/0x340 [i915]
[ 3.722037] [<ffffffff8208d812>] process_one_work+0x182/0x4e0
[ 3.722039] [<ffffffff8208dbdb>] worker_thread+0x6b/0x6a0
[ 3.722041] [<ffffffff8277ab6d>] ? __schedule+0x39d/0x890
[ 3.722042] [<ffffffff8208db70>] ? process_one_work+0x4e0/0x4e0
[ 3.722045] [<ffffffff82094a1b>] kthread+0xdb/0x100
[ 3.722047] [<ffffffff82094940>] ? kthread_create_on_node+0x1c0/0x1c0
[ 3.722048] [<ffffffff8277fe7c>] ret_from_fork+0x7c/0xb0
[ 3.722050] [<ffffffff82094940>] ? kthread_create_on_node+0x1c0/0x1c0
[ 3.722051] ---[ end trace eb9925ee23e16705 ]---

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.16.0-10.15-generic 3.16.1
Uname: Linux 3.16.0-10-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.6-0ubuntu2
Architecture: amd64
CasperVersion: 1.343
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Sun Aug 24 01:23:26 2014
DistUpgraded: Fresh install
DistroCodename: utopic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Device [1458:d000]
LiveMediaBuild: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140822)
MachineType: Gigabyte Technology Co., Ltd. Z87X-UD5H
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash --
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/12/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 10c
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z87X-UD5H-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr10c:bd06/12/2014:svnGigabyteTechnologyCo.,Ltd.:pnZ87X-UD5H:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ87X-UD5H-CF:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: Z87X-UD5H
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.12+14.10.20140812-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.2.6-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.2.6-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Sun Aug 24 01:20:23 2014
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Video Bus KEYBOARD, id 7
 input Power Button KEYBOARD, id 8
 input Logitech Unifying Device. Wireless PID:101b MOUSE, id 9
 input Logitech Unifying Device. Wireless PID:2008 KEYBOARD, id 10
xserver.errors:
 intel: Failed to load module "dri3" (module does not exist, 0)
 intel: Failed to load module "present" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 22746
 vendor GSM
xserver.version: 2:1.15.1-0ubuntu9