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After update to version 2.99.917-1~exp1ubuntu2.1, there is often problem
while using KWin effects. System hangs up for few seconds, KWin effects
get restarted and there is this message in dmesg:

[ 156.916691] ------------[ cut here ]------------
[ 156.916733] WARNING: CPU: 1 PID: 51 at /build/buildd/linux-3.19.0/drivers/gpu/drm/i915/intel_display.c:9564 intel_mmio_flip_work_func+0x17f/0x190 [i915]()
[ 156.916735] WARN_ON(__i915_wait_seqno(ring, seqno, intel_crtc->reset_counter, false, NULL, NULL) != 0)
[ 156.916736] Modules linked in:
[ 156.916738] xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables snd_hda_codec_conexant snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel intel_rapl iosf_mbi x86_pkg_temp_thermal wl(POE) snd_hda_controller snd_hda_codec rtsx_usb_ms uvcvideo intel_powerclamp memstick coretemp videobuf2_vmalloc snd_hwdep videobuf2_memops videobuf2_core snd_pcm v4l2_common snd_seq_midi kvm crct10dif_pclmul crc32_pclmul videodev snd_seq_midi_event ghash_clmulni_intel media aesni_intel snd_rawmidi aes_x86_64 snd_seq lrw snd_seq_device snd_timer gf128mul snd cfg80211 glue_helper soundcore joydev ablk_helper serio_raw cryptd lpc_ich shpchp mei_me parport_pc ppdev ie31200_edac
[ 156.916770] mei edac_core lp parport mac_hid rfcomm bnep bluetooth binfmt_misc nls_iso8859_1 rtsx_usb_sdmmc rtsx_usb hid_generic usbhid hid amdkfd amd_iommu_v2 radeon ahci psmouse libahci alx mdio i915 ttm i2c_algo_bit video drm_kms_helper drm
[ 156.916785] CPU: 1 PID: 51 Comm: kworker/1:1 Tainted: P IOE 3.19.0-16-generic #16-Ubuntu
[ 156.916787] Hardware name: LENOVO 20238/INVALID, BIOS 79CN33WW(V1.15) 08/12/2013
[ 156.916804] Workqueue: events intel_mmio_flip_work_func [i915]
[ 156.916806] ffffffffc02aae10 ffff88008f423cf8 ffffffff817c2235 0000000000000007
[ 156.916809] ffff88008f423d48 ffff88008f423d38 ffffffff8107595a ffff8801df254200
[ 156.916812] ffff8801d742eb30 ffff8801d742eb30 ffff8801d742e000 ffff8801df258300
[ 156.916815] Call Trace:
[ 156.916823] [<ffffffff817c2235>] dump_stack+0x45/0x57
[ 156.916827] [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
[ 156.916829] [<ffffffff810759d6>] warn_slowpath_fmt+0x46/0x50
[ 156.916835] [<ffffffff810138df>] ? __switch_to+0x44f/0x5e0
[ 156.916853] [<ffffffffc02432bf>] intel_mmio_flip_work_func+0x17f/0x190 [i915]
[ 156.916856] [<ffffffff8108eb78>] process_one_work+0x158/0x430
[ 156.916859] [<ffffffff8108f6bb>] worker_thread+0x5b/0x530
[ 156.916862] [<ffffffff8108f660>] ? rescuer_thread+0x3a0/0x3a0
[ 156.916864] [<ffffffff81094759>] kthread+0xc9/0xe0
[ 156.916867] [<ffffffff81094690>] ? kthread_create_on_node+0x1c0/0x1c0
[ 156.916871] [<ffffffff817c9298>] ret_from_fork+0x58/0x90
[ 156.916874] [<ffffffff81094690>] ? kthread_create_on_node+0x1c0/0x1c0
[ 156.916876] ---[ end trace ff4f72459f629413 ]---
[ 156.923769] drm/i915: Resetting chip after gpu hang

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.1
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Thu May 14 08:19:38 2015
InstallationDate: Installed on 2013-11-16 (543 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to vivid on 2015-04-25 (18 days ago)

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug vivid
-- 
dmesg: drm/i915: Resetting chip after gpu hang
https://bugs.launchpad.net/bugs/1454964
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