[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
** Tags added: cscc -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Anybody who can still reproduce this particular problem? ** Changed in: linux (Ubuntu Xenial) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Seems to fixed in last update. Can anybody confirm? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
> We had, however, one machine which lost video signal ~one sec after lightdm > showed up. X was still > running (since I could login blindly via lightdm). The issue disappeared > after we started > benchmarking the machine. Can't reproduce anymore. It turns out this issue was caused by a short circuit in the display cable. So I take that back as a symptom of this bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
** Changed in: linux (Ubuntu) Status: Expired => Confirmed ** Changed in: linux (Ubuntu Xenial) Status: Expired => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Hope the information helps, at least somebody else: Exact same issue on Skylake-desktop PCs. Tested on 12 PCs in our pc lab. Getting the trace in boot log on every single one. It appears short after boot, by the time lightdm shows up. All machines run with two displays. MB/BIOS: MSI MS-7971/Z170-A PRO (MS-7971), BIOS 1.D0 08/30/2016 CPU: i3-6100 So far there are no issues visible except the coredump/trace. We had, however, one machine which lost video signal ~one sec after lightdm showed up. X was still running (since I could login blindly via lightdm). The issue disappeared after we started benchmarking the machine. Can't reproduce anymore. After installing the proposed kernel from canonical-kernel-team ppa the issue seems resolved. Any idea when the patch hits v4.4.0? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
[Expired for linux (Ubuntu) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
[Expired for linux (Ubuntu Xenial) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu Xenial) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
** Tags removed: kernel-key ** Tags added: kernel-da-key ** Changed in: linux (Ubuntu) Status: Triaged => Incomplete ** Changed in: linux (Ubuntu Xenial) Status: Triaged => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Not sure if this is a related issue. HP 850 G3 laptop with docking station, external VGA connected. If the display blanks for more than an instant, the external display doesn't come back on until I undock and redock. This is OK: $ xset dpms force off; xset dpms force on This, on the other hand, leaves me with no external display: $ xset dpms force off; sleep 0.1 ; xset dpms force on Also possibly related or the same problem: if I dock with the VGA cable unplugged, and plug the VGA cable in, the external display is detected. Unplug, and it goes away. Plug it in for a second time and it's not detected again until I undock and redock, just like after a screen blank. This persists after updating to 4.8.0-32-generic #34~16.04.1-Ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Hmm, no problems related to it in that log, i915 would be more verbose. I just noticed the trace in the subject was caused by a lid close/open and is most likely not related. It would be worth trying this out to rule out the Intel X driver, save this as /etc/X11/xorg.conf Section "Device" Identifier "Configured Video Device" Driver "modesetting" EndSection -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
** Attachment added: "4.8.0-31.33~16.04.1 dmesg" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+attachment/4791210/+files/intel.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Claire was able to retest with the 4.8.0-31.33~16.04.1 Yakkety HWE kernel. She says the problem is still happening (ie. screen crashes and goes blank after about 20min). She captured her dmesg output after reproducing the issue with 4.8.0-31.33~16.04.1. I have attached it here, but am not seeing anything obvious, but would be good to get some second opinions. Thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
** Description changed: Filing on behalf of Claire Newman... I seem to be tickling a bug in the i915 stack, when I use a desktop monitor. The symptom is that the screen blanks for a few seconds then comes back . This happens every few minutes. I am using a Lenovo Thinkpad T460s (new this weekend) but last week I was using a Thinkpad - W550s - same issue with the blank screen on both laptops. + W550s - same issue with the blank screen on both laptops. Happens every + 20 mins or so and there is no identifiable reproducer (eg. I cam just be + sitting there doing something else on my phone and the screen goes + black). Here is lspci output for the video card: 00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07) (prog-if 00 [VGA controller]) - Subsystem: Lenovo Skylake Integrated Graphics - Flags: bus master, fast devsel, latency 0, IRQ 123 - Memory at e000 (64-bit, non-prefetchable) [size=16M] - Memory at c000 (64-bit, prefetchable) [size=512M] - I/O ports at e000 [size=64] - Expansion ROM at [disabled] - Capabilities: [40] Vendor Specific Information: Len=0c - Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 - Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit- - Capabilities: [d0] Power Management version 2 - Capabilities: [100] #1b - Capabilities: [200] Address Translation Service (ATS) - Capabilities: [300] #13 - Kernel driver in use: i915_bpo - Kernel modules: i915_bpo + Subsystem: Lenovo Skylake Integrated Graphics + Flags: bus master, fast devsel, latency 0, IRQ 123 + Memory at e000 (64-bit, non-prefetchable) [size=16M] + Memory at c000 (64-bit, prefetchable) [size=512M] + I/O ports at e000 [size=64] + Expansion ROM at [disabled] + Capabilities: [40] Vendor Specific Information: Len=0c + Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 + Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit- + Capabilities: [d0] Power Management version 2 + Capabilities: [100] #1b + Capabilities: [200] Address Translation Service (ATS) + Capabilities: [300] #13 + Kernel driver in use: i915_bpo + Kernel modules: i915_bpo And in dmesg I see the below text: [161321.406860] i915_bpo :00:02.0: BAR 6: [??? 0x flags 0x2] has bogus alignment [161528.013954] [ cut here ] [161528.013996] WARNING: CPU: 3 PID: 31178 at /build/linux-xHzv4a/linux-4.4.0/ubuntu/i915/intel_pm.c:3675 skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]() [161528.013998] WARN_ON(!wm_changed) [161528.014047] Modules linked in: hid_logitech_hidpp hid_generic hid_logitech_dj usbhid hid snd_usb_audio snd_usbmidi_lib cpuid drbg ansi_cprng ctr ccm rfcomm bnep snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel bluetooth arc4 joydev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp nls_iso8859_1 kvm snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_core irqbypass crct10dif_pclmul crc32_pclmul aesni_intel snd_compress ac97_bus aes_x86_64 snd_pcm_dmaengine dw_dmac_core iwlmvm lrw snd_hda_intel gf128mul glue_helper snd_hda_codec ablk_helper mac80211 cryptd snd_hda_core snd_hwdep snd_pcm input_leds serio_raw iwlwifi rtsx_pci_ms [161528.014074] cfg80211 memstick snd_seq_midi thinkpad_acpi snd_seq_midi_event snd_rawmidi nvram mei_me mei shpchp snd_seq snd_seq_device snd_timer snd soundcore tpm_crb mac_hid parport_pc ppdev lp parport autofs4 rtsx_pci_sdmmc i915_bpo intel_ips i2c_algo_bit drm_kms_helper psmouse e1000e syscopyarea sysfillrect sysimgblt ptp fb_sys_fops pps_core drm nvme rtsx_pci wmi video fjes [161528.014079] CPU: 3 PID: 31178 Comm: Xorg Not tainted 4.4.0-47-generic #68-Ubuntu [161528.014080] Hardware name: LENOVO 20F9CTO1WW/20F9CTO1WW, BIOS N1CET47W (1.15 ) 08/08/2016 [161528.014085] 0286 b170f762 88027b36f600 813f5aa3 [161528.014088] 88027b36f648 c02a39a0 88027b36f638 81081262 [161528.014091] 880522e26000 88003f96a148 880522e27000 880523193b78 [161528.014092] Call Trace: [161528.014102] [] dump_stack+0x63/0x90 [161528.014108] [] warn_slowpath_common+0x82/0xc0 [161528.014112] [] warn_slowpath_fmt+0x5c/0x80 [161528.014144] [] skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo] [161528.014175] [] skl_update_wm+0x185/0x610 [i915_bpo] [161528.014224] [] ? intel_ddi_enable_transcoder_func+0x17f/0x260 [i915_bpo] [161528.014273] [] intel_update_watermarks+0x1e/0x30 [i915_bpo] [161528.014326] [] haswell_crtc_enable+0x761/0x8e0 [i915_bpo] [161528.014378] [] ? intel_finish_crtc_commit+0xe/0x10 [i915_bpo] [161528.014395] [] ? drm_atomic_helper_com
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
The full dmesg on the machine with a kernel newer than 4.8.0-28.30~16.04.1 after it happens and not just the trace would be much appreciated as well. That patch series really should have fixed it. The full /var/log/kern.log would work even better. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
The BIOS version on the machine I tested: N1CET38W (1.06) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
After installing the linux-generic-hwe-16.04-edge (comment #2) and reboot, the 'uname -a' shows the kernel is 4.8.0-28-generic, and with this kernel, I can't see any warnings in the dmesg and can't see "screen blank" as well when connecting or disconnecting an external monitor. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Tested with linux-4.4.0-51-generic, the kernel printed a warning in the dmesg when connecting or disconnecting an external monitor (same as the ones in the bug description), but can't see any "screen blanks". -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Tested with linux-3.19.0.75-generic, there are lots of warnings in the dmesg when connecting a external monitor (same as the ones in the bug description), but can't see any "screen blanks". -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Does it still show the same warnings in dmesg with 4.8.0-28.30~16.04.1? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
Pasting some of my commentary here After further discussion with the team, I'm told this is a known issue with Skylake. This should be resolved in v4.9 and backports have been submitted to v4.8: https://lists.freedesktop.org/archives/intel- gfx/2016-October/109936.html I have asked sabdfl to proceed with testing the Yakkety HWE kernel to confirm this is indeed resolved for Claire. Note, I specficially requested testing with the linux-hwe-edge 4.8.0-28.30~16.04.1 from our Canonical Kernel Team PPA since it contains the i915 patches referenced above. sudo add-apt-repository ppa:canonical-kernel-team/ppa sudo apt-get update sudo apt-get install linux-generic-hwe-16.04-edge -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
It would be good to know what type of activity causes this bug. Does it happen only when using video in you're browser, such as youtube? Does it only happen when using Google Hangouts? Or, can you trigger the screen blanking when only using a single application, such as email? ** Tags added: kernel-key ** Also affects: linux (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Xenial) Status: New => Triaged ** Changed in: linux (Ubuntu Xenial) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643566 Title: [i915_bpo] Intermittent display outage with external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1643566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1643566] Re: [i915_bpo] Intermittent display outage with external monitor
** Description changed: Filing on behalf of Claire Newman... I seem to be tickling a bug in the i915 stack, when I use a desktop monitor. The symptom is that the screen blanks for a few seconds then - comes back . This happens every few minutes, and in dmesg I see the - below text. + comes back . This happens every few minutes. I am using a Lenovo + Thinkpad T460s (new this weekend) but last week I was using a Thinkpad + W550s - same issue with the blank screen on both laptops. + + Here is lspci output for the video card: + + 00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07) (prog-if 00 [VGA controller]) + Subsystem: Lenovo Skylake Integrated Graphics + Flags: bus master, fast devsel, latency 0, IRQ 123 + Memory at e000 (64-bit, non-prefetchable) [size=16M] + Memory at c000 (64-bit, prefetchable) [size=512M] + I/O ports at e000 [size=64] + Expansion ROM at [disabled] + Capabilities: [40] Vendor Specific Information: Len=0c + Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 + Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit- + Capabilities: [d0] Power Management version 2 + Capabilities: [100] #1b + Capabilities: [200] Address Translation Service (ATS) + Capabilities: [300] #13 + Kernel driver in use: i915_bpo + Kernel modules: i915_bpo + + And in dmesg I see the below text: [161321.406860] i915_bpo :00:02.0: BAR 6: [??? 0x flags 0x2] has bogus alignment [161528.013954] [ cut here ] [161528.013996] WARNING: CPU: 3 PID: 31178 at /build/linux-xHzv4a/linux-4.4.0/ubuntu/i915/intel_pm.c:3675 skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]() [161528.013998] WARN_ON(!wm_changed) [161528.014047] Modules linked in: hid_logitech_hidpp hid_generic hid_logitech_dj usbhid hid snd_usb_audio snd_usbmidi_lib cpuid drbg ansi_cprng ctr ccm rfcomm bnep snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel bluetooth arc4 joydev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp nls_iso8859_1 kvm snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_core irqbypass crct10dif_pclmul crc32_pclmul aesni_intel snd_compress ac97_bus aes_x86_64 snd_pcm_dmaengine dw_dmac_core iwlmvm lrw snd_hda_intel gf128mul glue_helper snd_hda_codec ablk_helper mac80211 cryptd snd_hda_core snd_hwdep snd_pcm input_leds serio_raw iwlwifi rtsx_pci_ms [161528.014074] cfg80211 memstick snd_seq_midi thinkpad_acpi snd_seq_midi_event snd_rawmidi nvram mei_me mei shpchp snd_seq snd_seq_device snd_timer snd soundcore tpm_crb mac_hid parport_pc ppdev lp parport autofs4 rtsx_pci_sdmmc i915_bpo intel_ips i2c_algo_bit drm_kms_helper psmouse e1000e syscopyarea sysfillrect sysimgblt ptp fb_sys_fops pps_core drm nvme rtsx_pci wmi video fjes [161528.014079] CPU: 3 PID: 31178 Comm: Xorg Not tainted 4.4.0-47-generic #68-Ubuntu [161528.014080] Hardware name: LENOVO 20F9CTO1WW/20F9CTO1WW, BIOS N1CET47W (1.15 ) 08/08/2016 [161528.014085] 0286 b170f762 88027b36f600 813f5aa3 [161528.014088] 88027b36f648 c02a39a0 88027b36f638 81081262 [161528.014091] 880522e26000 88003f96a148 880522e27000 880523193b78 [161528.014092] Call Trace: [161528.014102] [] dump_stack+0x63/0x90 [161528.014108] [] warn_slowpath_common+0x82/0xc0 [161528.014112] [] warn_slowpath_fmt+0x5c/0x80 [161528.014144] [] skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo] [161528.014175] [] skl_update_wm+0x185/0x610 [i915_bpo] [161528.014224] [] ? intel_ddi_enable_transcoder_func+0x17f/0x260 [i915_bpo] [161528.014273] [] intel_update_watermarks+0x1e/0x30 [i915_bpo] [161528.014326] [] haswell_crtc_enable+0x761/0x8e0 [i915_bpo] [161528.014378] [] ? intel_finish_crtc_commit+0xe/0x10 [i915_bpo] [161528.014395] [] ? drm_atomic_helper_commit_planes_on_crtc+0x154/0x270 [drm_kms_helper] [161528.014449] [] intel_atomic_commit+0x5d6/0x14a0 [i915_bpo] [161528.014488] [] ? drm_atomic_check_only+0x18e/0x590 [drm] [161528.014521] [] drm_atomic_commit+0x37/0x60 [drm] [161528.014538] [] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper] [161528.014571] [] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm] [161528.014587] [] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper] [161528.014601] [] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper] [161528.014615] [] drm_fb_helper_hotplug_event+0xd2/0x120 [drm_kms_helper] [161528.014628] [] drm_fb_helper_restore_fbdev_mode_unlocked+0x56/0x80 [drm_kms_helper] [161528.014640] [] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper] [161528.014694] [] intel_fbdev_set_par+0x1a/0x60 [i915_bpo] [161528.014698] [] fb_set_var+0x236/0x460
