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[Bug 1523088]


I'm having the same issue, on exactly the same machine as Aljaž Prusnik
in comment 31.

Machine is Dell XPS 9550 with i7-6700hq, kernel is 4.5.1 (from testing
on Arch Linux, using the X modesetting driver)

When starting X with external display attached and using xrandr it

a) takes very long to apply the mode, over 5 seconds
b) very often leaves the internal display completely black

When I move the mouse when it is in this mode, it'll lockup, leaving me
to only be able to poweroff the machine. When I redo xrandr without
moving the mouse, and get it to work on both screens, it'll work without
problems after that.

The lockups also happen after the screens wake up from DPMS power save.

It's not happening with a 4.4 kernel, but this one has other problems,
like endless flickering on the external display after a DPMS wakeup.

I'm really eager to have that patch, but since the merge window for 4.6
is already over, does this come with 4.7 the earliest?

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  WARN_ON(!wm_changed) warning and stacktrace in kernel log

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

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

  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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