I believe I am experiencing this issue also. Dell Optiplex 7040 with Intel I7-6700 (skylake) with integrated graphics (Intel HD 530) running Ubuntu 14.04.3 LTS.
Two monitors are connected via displayport cables. Issue also occurred when using displayport to DVI adapters.
The following is logged to /var/log/syslog every time I move the mouse cursor between screens. Occasionally when I move the mouse cursor to the other screen, the screen will blank and then a few seconds later come back on. Windows are not re-arranged (implying it is not the disappearance of a screen), and similar log entries are produced. No other rendering issues or graphics issues have been noted - Unity works fine. Running tuxracer does not cause any issues.
If there is any additional information I can provide that would be helpful please let me know.
I believe I am experiencing this issue also. Dell Optiplex 7040 with Intel I7-6700 (skylake) with integrated graphics (Intel HD 530) running Ubuntu 14.04.3 LTS.
Two monitors are connected via displayport cables. Issue also occurred when using displayport to DVI adapters.
The following is logged to /var/log/syslog every time I move the mouse cursor between screens. Occasionally when I move the mouse cursor to the other screen, the screen will blank and then a few seconds later come back on. Windows are not re-arranged (implying it is not the disappearance of a screen), and similar log entries are produced. No other rendering issues or graphics issues have been noted - Unity works fine. Running tuxracer does not cause any issues.
If there is any additional information I can provide that would be helpful please let me know.
Feb 9 10:07:56 computer-name kernel: [595457.353689] ------------[ cut here ]------------ linux-lts- vivid-LIqOuh/ linux-lts- vivid-3. 19.0/ubuntu/ i915/intel_ pm.c:3406 skl_update_ other_pipe_ wm+0x210/ 0x220 [i915_bpo]() !wm_changed) masquerade_ ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs pci_stub rfcomm bnep bluetooth binfmt_misc twofish_generic twofish_avx_x86_64 twofish_x86_64_3way twofish_x86_64 twofish_common xts snd_hda_codec_hdmi snd_hda_ codec_realtek snd_hda_ codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi joydev snd_seq snd_seq_device x86_pkg_ temp_thermal coretemp snd_timer dell_wmi sparse_keymap kvm_intel dcdbas kvm snd serio_raw soundcore 8250_fintek i2c_hid mac_hid acpi_pad i915_bpo intel_ips drm_kms_helper drm i2c_algo_bit shpchp parport_pc ppdev lp parport nls_iso8859_1 dm_crypt hid_generic usbhid hid crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd e1000e psmouse ptp ahci pps_core nvme libahci wmi video [last unloaded: vboxdrv] 1b5>] dump_stack+ 0x45/0x57 dea>] warn_slowpath_ common+ 0x8a/0xc0 e66>] warn_slowpath_ fmt+0x46/ 0x50 700>] skl_update_ other_pipe_ wm+0x210/ 0x220 [i915_bpo] 915>] skl_update_ wm+0x205/ 0x850 [i915_bpo] b0e>] ? gen9_read32+ 0x6e/0x2f0 [i915_bpo] 9fe>] intel_update_ watermarks+ 0x1e/0x30 [i915_bpo] ad0>] intel_finish_ crtc_commit+ 0x190/0x1b0 [i915_bpo] 6c9>] drm_atomic_ helper_ commit_ planes_ on_crtc+ 0x169/0x240 [drm_kms_helper] af8>] intel_atomic_ commit+ 0x68/0x100 [i915_bpo] 1f7>] drm_atomic_ commit+ 0x37/0x60 [drm] e75>] drm_atomic_ helper_ disable_ plane+0xf5/ 0x140 [drm_kms_helper] 7e9>] ? mutex_optimisti c_spin+ 0x139/0x1f0 cc0>] __setplane_ internal+ 0x1d0/0x2c0 [drm] 636>] ? __ww_mutex_ lock_slowpath+ 0x152/0x16c ecc>] drm_mode_ cursor_ universal+ 0x11c/0x200 [drm] 6af>] ? __ww_mutex_ lock+0x5f/ 0x97 02c>] drm_mode_ cursor_ common+ 0x7c/0x1b0 [drm] 757>] ? __sigqueue_ free.part. 12+0x37/ 0x40 301>] drm_mode_ cursor_ ioctl+0x41/ 0x50 [drm] aac>] drm_ioctl+ 0x1ec/0x660 [drm] da8>] do_vfs_ ioctl+0x2f8/ 0x510 8f2>] ? __set_task_ blocked+ 0x32/0x70 fd8>] ? __vfs_read+ 0x18/0x50 356>] ? __set_current_ blocked+ 0x36/0x90 041>] SyS_ioctl+0x81/0xa0 c0d>] system_ call_fastpath+ 0x16/0x1b
Feb 9 10:07:56 computer-name kernel: [595457.353710] WARNING: CPU: 4 PID: 1929 at /build/
Feb 9 10:07:56 computer-name kernel: [595457.353711] WARN_ON(
Feb 9 10:07:56 computer-name kernel: [595457.353712] Modules linked in: snd_seq_dummy cuse uas usb_storage vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_conntrack ipt_MASQUERADE nf_nat_
Feb 9 10:07:56 computer-name kernel: [595457.353749] CPU: 4 PID: 1929 Comm: Xorg Tainted: G W OE 3.19.0-49-generic #55~14.04.1-Ubuntu
Feb 9 10:07:56 computer-name kernel: [595457.353750] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.0.1 09/01/2015
Feb 9 10:07:56 computer-name kernel: [595457.353751] ffffffffc05f4268 ffff88045cbb7598 ffffffff817b01b5 0000000000000000
Feb 9 10:07:56 computer-name kernel: [595457.353753] ffff88045cbb75e8 ffff88045cbb75d8 ffffffff81074dea ffff88045cbb7710
Feb 9 10:07:56 computer-name kernel: [595457.353755] ffff88045f18b000 ffff88045cbb7680 ffff88045cbb7734 ffff88045f18d000
Feb 9 10:07:56 computer-name kernel: [595457.353757] Call Trace:
Feb 9 10:07:56 computer-name kernel: [595457.353762] [<ffffffff817b0
Feb 9 10:07:56 computer-name kernel: [595457.353765] [<ffffffff81074
Feb 9 10:07:56 computer-name kernel: [595457.353767] [<ffffffff81074
Feb 9 10:07:56 computer-name kernel: [595457.353775] [<ffffffffc0533
Feb 9 10:07:56 computer-name kernel: [595457.353784] [<ffffffffc0533
Feb 9 10:07:56 computer-name kernel: [595457.353797] [<ffffffffc057d
Feb 9 10:07:56 computer-name kernel: [595457.353806] [<ffffffffc0534
Feb 9 10:07:56 computer-name kernel: [595457.353820] [<ffffffffc059a
Feb 9 10:07:56 computer-name kernel: [595457.353827] [<ffffffffc0507
Feb 9 10:07:56 computer-name kernel: [595457.353842] [<ffffffffc05b4
Feb 9 10:07:56 computer-name kernel: [595457.353853] [<ffffffffc04a8
Feb 9 10:07:56 computer-name kernel: [595457.353859] [<ffffffffc0505
Feb 9 10:07:56 computer-name kernel: [595457.353862] [<ffffffff810bb
Feb 9 10:07:56 computer-name kernel: [595457.353870] [<ffffffffc0497
Feb 9 10:07:56 computer-name kernel: [595457.353873] [<ffffffff817b5
Feb 9 10:07:56 computer-name kernel: [595457.353880] [<ffffffffc0497
Feb 9 10:07:56 computer-name kernel: [595457.353882] [<ffffffff817b5
Feb 9 10:07:56 computer-name kernel: [595457.353889] [<ffffffffc0498
Feb 9 10:07:56 computer-name kernel: [595457.353892] [<ffffffff81080
Feb 9 10:07:56 computer-name kernel: [595457.353900] [<ffffffffc049c
Feb 9 10:07:56 computer-name kernel: [595457.353906] [<ffffffffc048c
Feb 9 10:07:56 computer-name kernel: [595457.353910] [<ffffffff811ff
Feb 9 10:07:56 computer-name kernel: [595457.353912] [<ffffffff81081
Feb 9 10:07:56 computer-name kernel: [595457.353914] [<ffffffff811ec
Feb 9 10:07:56 computer-name kernel: [595457.353917] [<ffffffff81084
Feb 9 10:07:56 computer-name kernel: [595457.353918] [<ffffffff81200
Feb 9 10:07:56 computer-name kernel: [595457.353921] [<ffffffff817b7
Feb 9 10:07:56 computer-name kernel: [595457.353922] ---[ end trace ca051f728083824b ]---