[Bug 97412] vblank wait timeout, giving kernel panic, while switching TTY

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97412

--- Comment #8 from Marcel Dijkstra <marcel.foss at gmail.com> ---
Succesfully installed drmp-tip kernel git#5b3638: "2017y-06m-08d-20h-34m-37s
UTC integration manifest". The kernel crashes switching to TTY2 with X11 on
DRI3, SNA on my Thinkpad, after switching about 5 cycles between TTY2 and TTY7.
No kernel panic is recorded in system log. Can only give DRM debug information
right before crash:

Jun 09 19:28:29 tinkpad kernel: [drm:drm_atomic_check_only [drm]] checking
ffff8801fad12800
Jun 09 19:28:29 tinkpad kernel: [drm:drm_atomic_helper_check_modeset
[drm_kms_helper]] Updating routing for [CONNECTOR:40:LVDS-1]
Jun 09 19:28:29 tinkpad kernel: [drm:drm_atomic_helper_check_modeset
[drm_kms_helper]] [CONNECTOR:40:LVDS-1] keeps [ENCODER:41:LVDS], now on
[CRTC:32:pipe A]
Jun 09 19:28:29 tinkpad kernel: [drm:intel_plane_atomic_calc_changes [i915]]
[CRTC:32:pipe A] has [PLANE:26:primary A] with fb 67
Jun 09 19:28:29 tinkpad kernel: [drm:intel_plane_atomic_calc_changes [i915]]
[PLANE:26:primary A] visible 1 -> 1, off 0, on 0, ms 0
Jun 09 19:28:29 tinkpad kernel: [drm:drm_atomic_commit [drm]] committing
ffff8801fad12800
Jun 09 19:28:29 tinkpad kernel: [drm:drm_atomic_state_default_clear [drm]]
Clearing atomic state ffff8801fad12800
Jun 09 19:28:29 tinkpad kernel: [drm:__drm_atomic_state_free [drm]] Freeing
atomic state ffff8801fad12800

Jun 09 19:38:08 tinkpad kernel: [drm:drm_atomic_add_affected_connectors [drm]]
Adding all current connectors for [CRTC:39:pipe B] to ffff88020f302800
Jun 09 19:38:08 tinkpad kernel: [drm:drm_atomic_check_only [drm]] checking
ffff88020f302800
Jun 09 19:38:08 tinkpad kernel: [drm:drm_atomic_helper_check_modeset
[drm_kms_helper]] Updating routing for [CONNECTOR:40:LVDS-1]
Jun 09 19:38:08 tinkpad kernel: [drm:drm_atomic_helper_check_modeset
[drm_kms_helper]] [CONNECTOR:40:LVDS-1] keeps [ENCODER:41:LVDS], now on
[CRTC:32:pipe A]
Jun 09 19:38:08 tinkpad kernel: [drm:intel_plane_atomic_calc_changes [i915]]
[CRTC:32:pipe A] has [PLANE:26:primary A] with fb 67
Jun 09 19:38:08 tinkpad kernel: [drm:intel_plane_atomic_calc_changes [i915]]
[PLANE:26:primary A] visible 1 -> 1, off 0, on 0, ms 0
Jun 09 19:38:08 tinkpad kernel: [drm:drm_atomic_commit [drm]] committing
ffff88020f302800
Jun 09 19:38:08 tinkpad kernel: [drm:drm_atomic_state_default_clear [drm]]
Clearing atomic state ffff88020f302800
Jun 09 19:38:08 tinkpad kernel: [drm:__drm_atomic_state_free [drm]] Freeing
atomic state ffff88020f302800

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