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[Aljaz Prusnik <1523088@xxxxxxxxxxxxxxxxxx>]

Happens also on a brand new XPS 15 9550 laptop. I tried also today's
kernel git (with some drm fixes for i915).

System is installed anew with Debian testing up-to-date, latest kernel
code and intel video driver 2:2.99.917+git20160218-1.

Symptoms:
- system boots (lightdm)
- laptop screen blinks like crazy, monitor picture is ok (Dell P2715Q, HDMI connection)
- after logging-in everything freezes - I have to turn-off computer.

What I do to make it work:
- boot without HDMI plugged-in
- after log-in, plug-in HDMI and then I have stable environment.

This is the trace I found in syslog:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 77 at drivers/gpu/drm/i915/intel_pm.c:3553 skl_update_other_pipe_wm+0x133/0x140 [i915]()
WARN_ON(!wm_changed)
Modules linked in: ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables snd_hda_codec_hdmi dell_led snd_hda_codec_realtek snd_hda_codec_generic bbswitch(O) intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel jitterentropy_rng joydev nls_utf8 dell_wmi nls_cp437 mxm_wmi drbg snd_hda_intel vfat ansi_cprng fat snd_hda_codec snd_hda_core aesni_intel efi_pstore snd_hwdep aes_x86_64 lrw gf128mul glue_helper ablk_helper dell_laptop dcdbas snd_pcm cryptd snd_timer evdev pcspkr snd efivars idma64 serio_raw i2c_i801 soundcore virt_dma brcmfmac brcmutil cfg80211 i915 intel_gtt i2c_algo_bit mei_me drm_kms_helper mei drm syscopyarea sysfillrect sysimgblt fb_sys_fops intel_lpss_pci processor_thermal_device shpchp intel_soc_dts_iosf battery hci_uart btbcm btintel int3403_thermal bluetooth dell_smo8800 wmi video rfkill intel_lpss_acpi intel_lpss int3400_thermal int3402_thermal tpm_tis int340x_thermal_zone acpi_thermal_rel ac acpi_pad tpm intel_hid button processor ecryptfs cbc sha256_ssse3 sha256_generic hmac encrypted_keys parport_pc ppdev lp parport efivarfs autofs4 ext4 crc16 mbcache jbd2 rtsx_pci_sdmmc mmc_core crc32c_intel psmouse ahci libahci xhci_pci libata rtsx_pci nvme xhci_hcd mfd_core scsi_mod usbcore usb_common fan thermal i2c_hid hid
CPU: 1 PID: 77 Comm: kworker/u16:1 Tainted: G           O    4.5.0-rc5+ #3
Hardware name: Dell Inc. XPS 15 9550/0N7TVV, BIOS 01.01.19 01/25/2016
Workqueue: events_unbound async_run_entry_fn
 0000000000000286 0000000055a2a6f3 ffffffff812e5b13 ffff88089825b7f8
 ffffffffa06617d0 ffffffff8105d93d ffff88089aa12000 ffff88089825b850
 ffff88089a2f9bd4 ffff88089abf3000 ffff88089abf33a8 ffffffff8105d9cc
Call Trace:
 [<ffffffff812e5b13>] ? dump_stack+0x5c/0x79
 [<ffffffff8105d93d>] ? warn_slowpath_common+0x7d/0xb0
 [<ffffffff8105d9cc>] ? warn_slowpath_fmt+0x5c/0x80
 [<ffffffffa059ddd3>] ? skl_update_other_pipe_wm+0x133/0x140 [i915]
 [<ffffffffa059df45>] ? skl_update_wm+0x165/0x5a0 [i915]
 [<ffffffff81575440>] ? _raw_spin_unlock_irqrestore+0x20/0x40
 [<ffffffffa062576c>] ? intel_ddi_enable_transcoder_func+0x17c/0x260 [i915]
 [<ffffffffa0609838>] ? haswell_crtc_enable+0x308/0x880 [i915]
 [<ffffffff81575440>] ? _raw_spin_unlock_irqrestore+0x20/0x40
 [<ffffffffa06052e2>] ? intel_atomic_commit+0x6d2/0x16c0 [i915]
 [<ffffffffa04d0845>] ? drm_atomic_check_only+0x185/0x600 [drm]
 [<ffffffffa04d10a2>] ? drm_atomic_add_affected_connectors+0x22/0xe0 [drm]
 [<ffffffffa0554d13>] ? restore_fbdev_mode+0x223/0x250 [drm_kms_helper]
 [<ffffffffa0556dee>] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x2e/0x70 [drm_kms_helper]
 [<ffffffffa0556e59>] ? drm_fb_helper_set_par+0x29/0x50 [drm_kms_helper]
 [<ffffffffa061c0a6>] ? intel_fbdev_set_par+0x16/0x60 [i915]
 [<ffffffff813543cd>] ? fbcon_init+0x54d/0x5e0
 [<ffffffff813b7df3>] ? visual_init+0xc3/0x120
 [<ffffffff813b9433>] ? do_bind_con_driver+0x1e3/0x3d0
 [<ffffffff813b995b>] ? do_take_over_console+0x13b/0x190
 [<ffffffff813503b3>] ? do_fbcon_takeover+0x53/0xb0
 [<ffffffff8107c475>] ? notifier_call_chain+0x45/0x70
 [<ffffffff8107c7e1>] ? __blocking_notifier_call_chain+0x41/0x60
 [<ffffffff8135c48f>] ? register_framebuffer+0x20f/0x360
 [<ffffffff813e2069>] ? vga_switcheroo_client_fb_set+0x19/0x70
 [<ffffffffa0557118>] ? drm_fb_helper_initial_config+0x298/0x420 [drm_kms_helper]
 [<ffffffffa061cc1b>] ? intel_fbdev_initial_config+0x1b/0x30 [i915]
 [<ffffffff8107dde5>] ? async_run_entry_fn+0x45/0x130
 [<ffffffff81075b41>] ? process_one_work+0x151/0x430
 [<ffffffff81075e6a>] ? worker_thread+0x4a/0x460
 [<ffffffff81075e20>] ? process_one_work+0x430/0x430
 [<ffffffff8107b7fd>] ? kthread+0xcd/0xf0
 [<ffffffff8107b730>] ? kthread_worker_fn+0x150/0x150
 [<ffffffff81575f8f>] ? ret_from_fork+0x3f/0x70
 [<ffffffff8107b730>] ? kthread_worker_fn+0x150/0x150
---[ end trace f9c041c4b6f1a3ff ]---

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https://bugs.launchpad.net/bugs/1523088

Title:
  WARN_ON(!wm_changed) warning and stacktrace in kernel log

Status in X.Org X server:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I always get an warning and stacktrace (and it seems to hang a little
  bit). This occurs after reboot as well as when I move with the cursor
  between my hdmi monitor and my laptop. (This only occurs when HDMI is
  connected)

  Default Kubuntu install version 15.10 with kernel 4.2.0-19-generic
  Processor: i5 6300hq
  Graphics: gtx950m

  WARNING: CPU: 1 PID: 827 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]()
  [Sam Dez  5 12:34:46 2015] WARN_ON(!wm_changed)
  [Sam Dez  5 12:34:46 2015] Modules linked in:
  [Sam Dez  5 12:34:46 2015]  nls_iso8859_1 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) drbg ansi_cprng ctr ccm rfcomm bnep arc4 rtsx_usb_ms memstick i2c_designware_platform i2c_designware_core acer_wmi sparse_keymap snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core intel_rapl snd_hwdep iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul snd_seq_device glue_helper snd_timer ablk_helper cryptd ath10k_pci ath10k_core snd ath mac80211 serio_raw soundcore idma64 virt_dma cfg80211 joydev input_leds uvcvideo mei_me videobuf2_vmalloc videobuf2_memops mei videobuf2_core v4l2_common intel_lpss_pci videodev media
  [Sam Dez  5 12:34:46 2015]  btusb btrtl btbcm btintel bluetooth shpchp dell_smo8800 intel_lpss_acpi intel_lpss tpm_crb acpi_pad mac_hid parport_pc ppdev lp parport autofs4 hid_generic hid_logitech_hidpp hid_logitech_dj usbhid rtsx_usb_sdmmc rtsx_usb uas usb_storage nouveau i915 mxm_wmi ttm i2c_algo_bit drm_kms_helper r8169 mii drm ahci libahci i2c_hid hid wmi pinctrl_sunrisepoint video pinctrl_intel
  [Sam Dez  5 12:34:46 2015] CPU: 1 PID: 827 Comm: Xorg Tainted: G        W  OE   4.2.0-19-generic #23-Ubuntu
  [Sam Dez  5 12:34:46 2015] Hardware name: Acer Aspire V5-591G/Usopp_SLS, BIOS V1.03 10/23/2015
  [Sam Dez  5 12:34:46 2015]  0000000000000000 00000000a287b8f0 ffff880071b03518 ffffffff817e93f9
  [Sam Dez  5 12:34:46 2015]  0000000000000000 ffff880071b03570 ffff880071b03558 ffffffff8107b3d6
  [Sam Dez  5 12:34:46 2015]  ffff880071b03620 ffff880071b036c4 ffff880279bf2000 ffff880279bf7000
  [Sam Dez  5 12:34:46 2015] Call Trace:
  [Sam Dez  5 12:34:46 2015]  [<ffffffff817e93f9>] dump_stack+0x45/0x57
  [Sam Dez  5 12:34:46 2015]  [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
  [Sam Dez  5 12:34:46 2015]  [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc017eb9e>] skl_update_other_pipe_wm+0x1de/0x1f0 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc017ed6b>] skl_update_wm+0x1bb/0x740 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01ca837>] ? gen9_read32+0xf7/0x2d0 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01b32a2>] ? i915_get_vblank_timestamp+0x62/0xa0 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01824be>] intel_update_watermarks+0x1e/0x30 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01e5ad9>] intel_finish_crtc_commit+0x169/0x190 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc00f3793>] drm_atomic_helper_commit_planes_on_crtc+0x143/0x260 [drm_kms_helper]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01fee3b>] intel_atomic_commit+0x6b/0x100 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0094d47>] drm_atomic_commit+0x37/0x60 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc00f20cf>] drm_atomic_helper_disable_plane+0xef/0x130 [drm_kms_helper]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc008493a>] __setplane_internal+0x23a/0x2f0 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0084b1b>] drm_mode_cursor_universal+0x12b/0x210 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffff817edf2f>] ? __ww_mutex_lock+0x5f/0xa0
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0084c81>] drm_mode_cursor_common+0x81/0x180 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0088ca0>] drm_mode_cursor_ioctl+0x50/0x70 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0079495>] drm_ioctl+0x125/0x610 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0088c50>] ? drm_mode_setcrtc+0x500/0x500 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [Sam Dez  5 12:34:46 2015]  [<ffffffff81087f71>] ? __set_task_blocked+0x41/0xa0
  [Sam Dez  5 12:34:46 2015]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [Sam Dez  5 12:34:46 2015]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [Sam Dez  5 12:34:46 2015] ---[ end trace c72c2dc92b88cd01 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  Date: Sat Dec  5 12:35:24 2015
  ExecutablePath: /usr/bin/Xorg
  InstallationDate: Installed on 2015-12-04 (0 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: xorg-server
  UpgradeStatus: No upgrade log present (probably fresh install)

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