[Bug 93741] blank screen at boot with 4.4.0 and skylake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93741

--- Comment #4 from Alin M Elena <alinm.elena at gmail.com> ---

this is the one I tried and booted. 
5807fca

with the logs may be tricky to get since when I get a black screen there is
none.. and I have no network card on that machine.

Alin

when 4.4.0 boots I keep getting this... I suspect totally unrelated... 
[27190.667123] ------------[ cut here ]------------
[27190.667138] WARNING: CPU: 2 PID: 21375 at
../drivers/gpu/drm/i915/intel_pm.c:3597 skl_update_other_pipe_wm+0x1ba/0x1c0
[i915]()
[27190.667139] WARN_ON(!wm_changed)
[27190.667140] Modules linked in:
[27190.667141]  uas usb_storage fuse hid_generic hidp cmac ecb rfcomm af_packet
bnep snd_hda_codec_hdmi dell_led snd_hda_codec_realtek snd_hda_codec_generic
x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel nls_iso8859_1
kvm_intel snd_hda_codec uvcvideo dell_laptop videobuf2_vmalloc dcdbas
videobuf2_memops snd_hda_core i2c_designware_platform nls_cp437 snd_hwdep kvm
videobuf2_v4l2 vfat irqbypass snd_pcm i2c_designware_core crct10dif_pclmul
dell_wmi videobuf2_core sparse_keymap v4l2_common fat crc32_pclmul snd_timer
brcmfmac brcmutil snd aesni_intel aes_x86_64 lrw gf128mul glue_helper
ablk_helper btusb cryptd btrtl rtsx_pci_ms idma64 virt_dma pcspkr soundcore
i2c_i801 videodev joydev cfg80211 memstick mei_me mei shpchp intel_lpss_pci
processor_thermal_device intel_soc_dts_iosf hci_uart btbcm
[27190.667172]  btqca btintel pinctrl_sunrisepoint pinctrl_intel fan bluetooth
thermal rfkill intel_lpss_acpi intel_lpss int3403_thermal int340x_thermal_zone
int3400_thermal acpi_thermal_rel acpi_als kfifo_buf industrialio battery
acpi_pad tpm_tis ac tpm hid_multitouch usbhid i915 rtsx_pci_sdmmc mmc_core
crc32c_intel i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops rtsx_pci serio_raw xhci_pci xhci_hcd usbcore nvme mfd_core
usb_common drm wmi i2c_hid video button fjes sg efivarfs
[27190.667193] CPU: 2 PID: 21375 Comm: X Tainted: G        W      
4.4.0-3.g75554c0-default #1
[27190.667194] Hardware name: Dell Inc. XPS 13 9350/0VM5NC, BIOS 1.1.9
12/18/2015
[27190.667195]  ffffffffa0356c08 ffff880466bc77c8 ffffffff8137f639
ffff880466bc7810
[27190.667197]  ffff880466bc7800 ffffffff8107d132 ffff88046a766000
ffff880466bc792c
[27190.667199]  ffff88046a292000 0000000000000000 ffff880466bc7898
ffff880466bc7860
[27190.667200] Call Trace:
[27190.667208]  [<ffffffff8101a095>] try_stack_unwind+0x175/0x190
[27190.667212]  [<ffffffff81018fe9>] dump_trace+0x69/0x3a0
[27190.667215]  [<ffffffff8101a0fb>] show_trace_log_lvl+0x4b/0x60
[27190.667217]  [<ffffffff8101942c>] show_stack_log_lvl+0x10c/0x180
[27190.667219]  [<ffffffff8101a195>] show_stack+0x25/0x50
[27190.667226]  [<ffffffff8137f639>] dump_stack+0x4b/0x72
[27190.667234]  [<ffffffff8107d132>] warn_slowpath_common+0x82/0xc0
[27190.667237]  [<ffffffff8107d1bc>] warn_slowpath_fmt+0x4c/0x50
[27190.667246]  [<ffffffffa0293c1a>] skl_update_other_pipe_wm+0x1ba/0x1c0
[i915]
[27190.667256]  [<ffffffffa0293e52>] skl_update_wm+0x232/0x7a0 [i915]
[27190.667264]  [<ffffffffa02982ee>] intel_update_watermarks+0x1e/0x30 [i915]
[27190.667278]  [<ffffffffa02ff150>] haswell_crtc_enable+0x370/0x870 [i915]
[27190.667291]  [<ffffffffa02fc0f8>] intel_atomic_commit+0x448/0x6d0 [i915]
[27190.667305]  [<ffffffffa0088107>] drm_atomic_commit+0x37/0x60 [drm]
[27190.667311]  [<ffffffffa021bec6>] drm_atomic_helper_set_config+0x76/0xb0
[drm_kms_helper]
[27190.667320]  [<ffffffffa00776c2>] drm_mode_set_config_internal+0x62/0x100
[drm]
[27190.667328]  [<ffffffffa007bb5f>] drm_mode_setcrtc+0x3bf/0x4e0 [drm]
[27190.667334]  [<ffffffffa006d612>] drm_ioctl+0x152/0x540 [drm]
[27190.667338]  [<ffffffff8120e328>] do_vfs_ioctl+0x288/0x470
[27190.667342]  [<ffffffff8120e589>] SyS_ioctl+0x79/0x90
[27190.667346]  [<ffffffff816aa036>] entry_SYSCALL_64_fastpath+0x16/0x75
[27190.668400] DWARF2 unwinder stuck at entry_SYSCALL_64_fastpath+0x16/0x75

[27190.668402] Leftover inexact backtrace:

[27190.668404] ---[ end trace ca7a924b37d1024a ]---

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