[Intel-gfx] i915 warning: WARN_ON_ONCE(!intel_dp->lane_count)

[Linus Torvalds]

This isn't new, but I thought I'd report it since it doesn't seem to
get fixed on its own..

  [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on minor 0
  ------------[ cut here ]------------
  WARNING: CPU: 1 PID: 130 at drivers/gpu/drm/i915/intel_dp.c:4018
intel_dp_check_link_status+0x1db$
  WARN_ON_ONCE(!intel_dp->lane_count)
  Modules linked in:
   rtsx_pci_sdmmc mmc_core crct10dif_pclmul crc32_pclmul crc32c_intel
i915 ghash_clmulni_intel i2c_$
  CPU: 1 PID: 130 Comm: kworker/u8:7 Not tainted 4.9.0-04822-g9439b3710df6 #6
  Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.4.4 06/14/2016
  Workqueue: events_unbound async_run_entry_fn
  Call Trace:
   intel_dp_check_link_status+0x1db/0x200 [i915]
   intel_dp_detect+0x697/0xa40 [i915]
   drm_helper_probe_single_connector_modes+0x2a3/0x500 [drm_kms_helper]
   drm_setup_crtcs+0x7b/0x9c0 [drm_kms_helper]
   drm_fb_helper_initial_config+0x79/0x3e0 [drm_kms_helper]
   intel_fbdev_initial_config+0x18/0x30 [i915]
   async_run_entry_fn+0x37/0x150
   process_one_work+0x1f1/0x480
   worker_thread+0x48/0x4d0
   kthread+0x101/0x140
   ret_from_fork+0x22/0x30
  ---[ end trace 10162024459bbe32 ]---

That's obviously my XPS13, and it has nothing attached to it, so just
the internal laptop display.

This is all intel, with the Skylake Iris Graphics 540 (i7-6560U).

Everything seems to work fine, it's just the ugly warning.

               Linus