I also have the same issue, fresh install of kubuntu 15.10, always after booting I get several Warnings. I use a hdmi monitor. Last extract from dmesg:
[ 44.476443] WARNING: CPU: 0 PID: 768 at /build/linux-26_gwp/linux-4.2.0/drivers/gpu/drm/i915/intel_pm.c:3404 skl_update_other_pipe_wm+0x1de/0x1f0 [i915]() [ 44.476444] WARN_ON(!wm_changed) [ 44.476445] Modules linked in: [ 44.476446] arc4 rtsx_usb_ms rtsx_usb_sdmmc memstick rtsx_usb bbswitch(OE) bnep hid_logitech_hidpp hid_logitech_dj hid_generic usbhid joydev snd_hda_codec_hdmi uvcvideo i2c_designware_platform acer_wmi sparse_keymap nvidia(POE) i2c_designware_core videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common snd_hda_codec_realtek snd_hda_codec_generic videodev media intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_intel snd_hda_codec snd_hda_core btusb snd_hwdep btrtl snd_pcm btbcm btintel bluetooth snd_seq_midi snd_seq_midi_event snd_rawmidi aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_seq ath10k_pci ath10k_core ath mac80211 snd_seq_device snd_timer idma64 virt_dma snd input_leds serio_raw cfg80211 soundcore [ 44.476472] mei_me mei intel_lpss_pci shpchp dell_smo8800 tpm_crb wmi intel_lpss_acpi intel_lpss acpi_pad mac_hid parport_pc ppdev lp parport autofs4 uas usb_storage i915 i2c_algo_bit drm_kms_helper r8169 drm ahci mii libahci i2c_hid hid pinctrl_sunrisepoint video pinctrl_intel [ 44.476483] CPU: 0 PID: 768 Comm: Xorg Tainted: P W OE 4.2.0-19-generic #23-Ubuntu [ 44.476484] Hardware name: Acer Aspire V5-591G/Usopp_SLS, BIOS V1.03 10/23/2015 [ 44.476485] 0000000000000000 00000000f2cd7fef ffff88027509f628 ffffffff817e93f9 [ 44.476487] 0000000000000000 ffff88027509f680 ffff88027509f668 ffffffff8107b3d6 [ 44.476488] ffff88027509f730 ffff88027509f7d4 ffff880274872000 ffff880274873000 [ 44.476490] Call Trace: [ 44.476493] [<ffffffff817e93f9>] dump_stack+0x45/0x57 [ 44.476496] [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0 [ 44.476498] [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70 [ 44.476504] [<ffffffffc014eb9e>] skl_update_other_pipe_wm+0x1de/0x1f0 [i915] [ 44.476510] [<ffffffffc014ed6b>] skl_update_wm+0x1bb/0x740 [i915] [ 44.476511] [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60 [ 44.476518] [<ffffffffc01524be>] intel_update_watermarks+0x1e/0x30 [i915] [ 44.476530] [<ffffffffc01b9f68>] haswell_crtc_enable+0x488/0xa90 [i915] [ 44.476541] [<ffffffffc01b6d96>] __intel_set_mode+0x916/0xb60 [i915] [ 44.476551] [<ffffffffc01bdb06>] intel_crtc_set_config+0x2b6/0x580 [i915] [ 44.476561] [<ffffffffc0094ef5>] ? drm_mode_create+0x25/0x60 [drm] [ 44.476568] [<ffffffffc008e4a6>] drm_mode_set_config_internal+0x66/0x100 [drm] [ 44.476575] [<ffffffffc0092b39>] drm_mode_setcrtc+0x3e9/0x500 [drm] [ 44.476580] [<ffffffffc0083495>] drm_ioctl+0x125/0x610 [drm] [ 44.476586] [<ffffffffc0092750>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] [ 44.476589] [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480 [ 44.476591] [<ffffffff81087f71>] ? __set_task_blocked+0x41/0xa0 [ 44.476592] [<ffffffff81210c89>] SyS_ioctl+0x79/0x90 [ 44.476594] [<ffffffff8108ab84>] ? SyS_rt_sigprocmask+0x74/0xc0 [ 44.476597] [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75 [ 44.476598] ---[ end trace 54ca44dc723584de ]--- [ 45.796098] vgaarb: this pci device is not a vga device
Do you need additional information?
I also have the same issue, fresh install of kubuntu 15.10, always after booting I get several Warnings.
I use a hdmi monitor.
Last extract from dmesg:
[ 44.476443] WARNING: CPU: 0 PID: 768 at /build/ linux-26_ gwp/linux- 4.2.0/drivers/ gpu/drm/ i915/intel_ pm.c:3404 skl_update_ other_pipe_ wm+0x1de/ 0x1f0 [i915]() !wm_changed) platform acer_wmi sparse_keymap nvidia(POE) i2c_designware_core videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common snd_hda_ codec_realtek snd_hda_ codec_generic videodev media intel_rapl iosf_mbi x86_pkg_ temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_intel snd_hda_codec snd_hda_core btusb snd_hwdep btrtl snd_pcm btbcm btintel bluetooth snd_seq_midi snd_seq_midi_event snd_rawmidi aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_seq ath10k_pci ath10k_core ath mac80211 snd_seq_device snd_timer idma64 virt_dma snd input_leds serio_raw cfg80211 soundcore sunrisepoint video pinctrl_intel 3f9>] dump_stack+ 0x45/0x57 3d6>] warn_slowpath_ common+ 0x86/0xc0 465>] warn_slowpath_ fmt+0x55/ 0x70 b9e>] skl_update_ other_pipe_ wm+0x1de/ 0x1f0 [i915] d6b>] skl_update_ wm+0x1bb/ 0x740 [i915] 110>] ? wake_atomic_ t_function+ 0x60/0x60 4be>] intel_update_ watermarks+ 0x1e/0x30 [i915] f68>] haswell_ crtc_enable+ 0x488/0xa90 [i915] d96>] __intel_ set_mode+ 0x916/0xb60 [i915] b06>] intel_crtc_ set_config+ 0x2b6/0x580 [i915] ef5>] ? drm_mode_ create+ 0x25/0x60 [drm] 4a6>] drm_mode_ set_config_ internal+ 0x66/0x100 [drm] b39>] drm_mode_ setcrtc+ 0x3e9/0x500 [drm] 495>] drm_ioctl+ 0x125/0x610 [drm] 750>] ? drm_mode_ setplane+ 0x1b0/0x1b0 [drm] a25>] do_vfs_ ioctl+0x295/ 0x480 f71>] ? __set_task_ blocked+ 0x41/0xa0 c89>] SyS_ioctl+0x79/0x90 b84>] ? SyS_rt_ sigprocmask+ 0x74/0xc0 1f2>] entry_SYSCALL_ 64_fastpath+ 0x16/0x75
[ 44.476444] WARN_ON(
[ 44.476445] Modules linked in:
[ 44.476446] arc4 rtsx_usb_ms rtsx_usb_sdmmc memstick rtsx_usb bbswitch(OE) bnep hid_logitech_hidpp hid_logitech_dj hid_generic usbhid joydev snd_hda_codec_hdmi uvcvideo i2c_designware_
[ 44.476472] mei_me mei intel_lpss_pci shpchp dell_smo8800 tpm_crb wmi intel_lpss_acpi intel_lpss acpi_pad mac_hid parport_pc ppdev lp parport autofs4 uas usb_storage i915 i2c_algo_bit drm_kms_helper r8169 drm ahci mii libahci i2c_hid hid pinctrl_
[ 44.476483] CPU: 0 PID: 768 Comm: Xorg Tainted: P W OE 4.2.0-19-generic #23-Ubuntu
[ 44.476484] Hardware name: Acer Aspire V5-591G/Usopp_SLS, BIOS V1.03 10/23/2015
[ 44.476485] 0000000000000000 00000000f2cd7fef ffff88027509f628 ffffffff817e93f9
[ 44.476487] 0000000000000000 ffff88027509f680 ffff88027509f668 ffffffff8107b3d6
[ 44.476488] ffff88027509f730 ffff88027509f7d4 ffff880274872000 ffff880274873000
[ 44.476490] Call Trace:
[ 44.476493] [<ffffffff817e9
[ 44.476496] [<ffffffff8107b
[ 44.476498] [<ffffffff8107b
[ 44.476504] [<ffffffffc014e
[ 44.476510] [<ffffffffc014e
[ 44.476511] [<ffffffff810bd
[ 44.476518] [<ffffffffc0152
[ 44.476530] [<ffffffffc01b9
[ 44.476541] [<ffffffffc01b6
[ 44.476551] [<ffffffffc01bd
[ 44.476561] [<ffffffffc0094
[ 44.476568] [<ffffffffc008e
[ 44.476575] [<ffffffffc0092
[ 44.476580] [<ffffffffc0083
[ 44.476586] [<ffffffffc0092
[ 44.476589] [<ffffffff81210
[ 44.476591] [<ffffffff81087
[ 44.476592] [<ffffffff81210
[ 44.476594] [<ffffffff8108a
[ 44.476597] [<ffffffff817f0
[ 44.476598] ---[ end trace 54ca44dc723584de ]---
[ 45.796098] vgaarb: this pci device is not a vga device
Do you need additional information?