Hit this on an i7-6560U running 3.19.0-58-generic This is a bug in the kernel that was talking about it and got closed https://bugzilla.kernel.org/show_bug.cgi?id=99581 [17541.308606] ------------[ cut here ]------------ [17541.308636] WARNING: CPU: 0 PID: 13511 at /build/linux-lts-vivid-6tG2ln/linux-lts-vivid -3.19.0/ubuntu/i915/intel_display.c:11004 intel_mmio_flip_work_func+0x35f/0x3c0 [i915_bpo]() [17541.308637] WARN_ON(__i915_wait_request(mmio_flip->req, mmio_flip->crtc->reset_counter, false, NULL, &mmio_flip->i915->rps.mmioflips)) [17541.308638] Modules linked in: dell_wmi sparse_keymap ctr ccm nvram msr arc4 dm_crypt s nd_hda_codec_hdmi(OE) dell_led snd_hda_codec_realtek(OE) snd_hda_codec_generic(OE) dell_laptop dcdbas x86_pkg_temp_thermal coretemp s nd_hda_intel(OE) snd_hda_codec(OE) snd_hda_core(OE) snd_hwdep kvm_intel dm_multipath scsi_dh kvm iwlmvm(OE) mac80211(OE) cmac crct10d if_pclmul crc32_pclmul ghash_clmulni_intel iwlwifi(OE) rts_cr_host(OE) cfg80211(OE) rts_cr_core(OE) aesni_intel aes_x86_64 snd_pcm lr w gf128mul glue_helper ablk_helper snd_seq_midi cryptd hid_multitouch snd_seq_midi_event uvcvideo videobuf2_vmalloc videobuf2_memops snd_rawmidi videobuf2_core v4l2_common videodev media joydev serio_raw rfcomm(OE) bnep(OE) snd_seq snd_seq_device snd_timer snd sound core shpchp i2c_hid i915_bpo int3403_thermal intel_ips drm_kms_helper int3400_thermal acpi_thermal_rel drm intel_hid(OE) acpi_pad i2c _algo_bit mac_hid parport_pc nls_iso8859_1 ppdev lp parport btrfs xor raid6_pq dm_mirror dm_region_hash dm_log btusb(OE) btintel(OE) bluetooth(OE) compat(OE) hid_generic usbhid hid psmouse(OE) ahci nvme libahci wmi video [17541.308693] CPU: 0 PID: 13511 Comm: kworker/0:1 Tainted: G W OE 3.19.0-33-gene ric #38~14.04.1-Ubuntu [17541.308694] Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.2.3 01/08/2016 [17541.308707] Workqueue: events intel_mmio_flip_work_func [i915_bpo] [17541.308708] ffffffffc062c890 ffff880389bcbce8 ffffffff817af41b 0000000000000000 [17541.308710] ffff880389bcbd38 ffff880389bcbd28 ffffffff81074daa ffff880074a91600 [17541.308711] ffff880386afc140 ffff88040b9e9180 ffff880480c13680 ffff880386afc140 [17541.308713] Call Trace: [17541.308719] [<ffffffff817af41b>] dump_stack+0x45/0x57 [17541.308722] [<ffffffff81074daa>] warn_slowpath_common+0x8a/0xc0 [17541.308723] [<ffffffff81074e26>] warn_slowpath_fmt+0x46/0x50 [17541.308736] [<ffffffffc05c882f>] intel_mmio_flip_work_func+0x35f/0x3c0 [i915_bpo] [17541.308738] [<ffffffff8108db8f>] process_one_work+0x14f/0x400 [17541.308739] [<ffffffff8108e328>] worker_thread+0x118/0x510 [17541.308741] [<ffffffff8108e210>] ? rescuer_thread+0x3d0/0x3d0 [17541.308743] [<ffffffff81093822>] kthread+0xd2/0xf0 [17541.308745] [<ffffffff81093750>] ? kthread_create_on_node+0x1c0/0x1c0 [17541.308747] [<ffffffff817b6d18>] ret_from_fork+0x58/0x90 [17541.308748] [<ffffffff81093750>] ? kthread_create_on_node+0x1c0/0x1c0 [17541.308749] ---[ end trace 5240514278d57b1b ]---
It's a WARN in the kernel following a GPU hang from userspace. Silenced with commit f4457ae71fd6c3bc9ab979839258411a34baa7f6 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Apr 13 17:35:08 2016 +0100 drm/i915: Prevent leaking of -EIO from i915_wait_request()
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