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 int34
0x_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 O4.5.0-rc5+ #3
Hardware name: Dell Inc. XPS 15 9550/0N7TVV, BIOS 01.01.19 01/25/2016
Workqueue: events_unbound async_run_entry_fn
0286 55a2a6f3 812e5b13 88089825b7f8
a06617d0 8105d93d 88089aa12000 88089825b850
88089a2f9bd4 88089abf3000 88089abf33a8 8105d9cc
Call Trace:
[] ? dump_stack+0x5c/0x79
[] ? warn_slowpath_common+0x7d/0xb0
[] ? warn_slowpath_fmt+0x5c/0x80
[] ? skl_update_other_pipe_wm+0x133/0x140 [i915]
[] ? skl_update_wm+0x165/0x5a0 [i915]
[] ? _raw_spin_unlock_irqrestore+0x20/0x40
[] ? intel_ddi_enable_transcoder_func+0x17c/0x260 [i915]
[] ? haswell_crtc_enable+0x308/0x880 [i915]
[] ? _raw_spin_unlock_irqrestore+0x20/0x40
[] ? intel_atomic_commit+0x6d2/0x16c0 [i915]
[] ? drm_atomic_check_only+0x185/0x600 [drm]
[] ? drm_atomic_add_affected_connectors+0x22/0xe0 [drm]
[] ? restore_fbdev_mode+0x223/0x250 [drm_kms_helper]
[] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x2e/0x70
[drm_kms_helper]
[] ? drm_fb_helper_set_par+0x29/0x50 [drm_kms_helper]
[] ? intel_fbdev_set_par+0x16/0x60 [i915]
[] ? fbcon_init+0x54d/0x5e0
[] ? visual_init+0xc3/0x120
[] ? do_bind_con_driver+0x1e3/0x3d0
[] ? do_take_over_console+0x13b/0x190
[] ? do_fbcon_takeover+0x53/0xb0
[] ? notifier_call_chain+0x45/0x70
[] ? __blocking_notifier_call_chain+0x41/0x60
[] ? register_framebuffer+0x20f/0x360
[] ? vga_switcheroo_client_fb_set+0x19/0x70
[] ? drm_fb_helper_initial_config+0x298/0x420
[drm_kms_helper]
[] ? intel_fbdev_initial_config+0x1b/0x30 [i915]
[] ? async_run_entry_fn+0x45/0x130
[] ? process_one_work+0x151/0x430
[] ? worker_thread+0x4a/0x460
[] ? process_one_work+0x430/0x430
[] ? kthread+0xcd/0xf0
[] ? kthread_worker_fn+0x150/0x150
[] ? ret_from_fork+0x3f/0x70
[] ? kthread_worker_fn+0x150/0x150
---[ end trace f9c041c4b6f1a3ff ]---
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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 1
