Comment 14 for bug 1420290

I have this crashes on my Macbook Air. It doesn't hangs notebook.

* Ubuntu 15.04
* MacBookAir6,2
* Linux jupiter 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
* libdrm-2.4.60
* kernel cmdline: i915.enable_rc6=1 i915.enable_fbc=1 i915.lvds_downclock=1 vt.handoff=7

It's seems that I'm not alone:
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1420290
* https://bugzilla.redhat.com/show_bug.cgi?id=1190511
* https://bugzilla.redhat.com/show_bug.cgi?id=1181071
* https://bugzilla.redhat.com/show_bug.cgi?id=1184161
* https://bugzilla.redhat.com/show_bug.cgi?id=1183209

[ 132.862376] ------------[ cut here ]------------
[ 132.862433] WARNING: CPU: 2 PID: 0 at /build/buildd/linux-3.19.0/drivers/gpu/drm/i915/intel_display.c:9713 intel_check_page_flip+0xda/0xf0 [i915]()
[ 132.862436] Kicking stuck page flip: queued at 7087, now 7095
[ 132.862438] Modules linked in: pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) binfmt_misc rfcomm bnep nls_iso8859_1 btusb bluetooth mba6x_bl(OE) joydev applesmc input_polldev intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul wl(POE) ghash_clmulni_intel snd_seq_midi snd_seq_midi_event snd_hda_codec_hdmi snd_hda_codec_cirrus aesni_intel bcm5974 snd_hda_codec_generic aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm lpc_ich cfg80211 snd_rawmidi thunderbolt bdc_pci shpchp snd_seq mei_me mei snd_seq_device dw_dmac_pci snd_timer dw_dmac_core snd soundcore sbs sbshc spi_pxa2xx_platform apple_bl mac_hid parport_pc ppdev lp parport autofs4 hid_generic hid_apple usbhid hid i915 i2c_algo_bit drm_kms_helper ahci uas libahci drm usb_storage video
[ 132.862499] CPU: 2 PID: 0 Comm: swapper/2 Tainted: P U OE 3.19.0-15-generic #15-Ubuntu
[ 132.862502] Hardware name: Apple Inc. MacBookAir6,2/Mac-7DF21CB3ED6977E5, BIOS MBA61.88Z.0099.B18.1501071032 01/07/2015
[ 132.862504] ffffffffc03c4e10 ffff88026f283d28 ffffffff817c2205 0000000000000007
[ 132.862507] ffff88026f283d78 ffff88026f283d68 ffffffff8107595a ffff88026f283d88
[ 132.862511] ffff880035ea4000 ffff880035e90800 0000000000000000 ffff880035e909a8
[ 132.862514] Call Trace:
[ 132.862517] <IRQ> [<ffffffff817c2205>] dump_stack+0x45/0x57
[ 132.862531] [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
[ 132.862534] [<ffffffff810759d6>] warn_slowpath_fmt+0x46/0x50
[ 132.862563] [<ffffffffc0370a3a>] intel_check_page_flip+0xda/0xf0 [i915]
[ 132.862588] [<ffffffffc033d948>] ironlake_irq_handler+0x2e8/0xfd0 [i915]
[ 132.862596] [<ffffffff810956ff>] ? notifier_call_chain+0x4f/0x80
[ 132.862602] [<ffffffff810cd5f7>] handle_irq_event_percpu+0x77/0x1a0
[ 132.862606] [<ffffffff810cd761>] handle_irq_event+0x41/0x70
[ 132.862612] [<ffffffff810d07ce>] handle_edge_irq+0x6e/0x120
[ 132.862615] [<ffffffff81017772>] handle_irq+0x22/0x40
[ 132.862620] [<ffffffff817cc27f>] do_IRQ+0x4f/0xf0
[ 132.862623] [<ffffffff817ca0ed>] common_interrupt+0x6d/0x6d
[ 132.862625] <EOI> [<ffffffff816643d5>] ? cpuidle_enter_state+0x65/0x160
[ 132.862632] [<ffffffff816643c1>] ? cpuidle_enter_state+0x51/0x160
[ 132.862635] [<ffffffff816645b7>] cpuidle_enter+0x17/0x20
[ 132.862639] [<ffffffff810b6a41>] cpu_startup_entry+0x311/0x3b0
[ 132.862643] [<ffffffff81048f97>] start_secondary+0x197/0x1c0
[ 132.862646] ---[ end trace facd2167bed8b109 ]---