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2p2c display configuration times out between each IGT test

Kernel: recent DRM-Tip

Config: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_7370/kernel.config.bz2

Host: re-tgl-u - two TC-DP cables to Dell 5k display

Example (dmesg timestamps feel valid when watching the test execution):

[  680.148019] [IGT] core_getversion: executing
[  680.152439] [IGT] core_getversion: exiting, ret=0
[  680.152607] Setting dangerous option reset - tainting kernel
[  690.344732] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  700.584731] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:299:DP-2] flip_done timed out
[  710.824729] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:92:plane 1B] flip_done timed out
[  721.064726] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  731.304725] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  741.544726] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:299:DP-2] flip_done timed out
[  751.784712] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:92:plane 1B] flip_done timed out
[  762.024733] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  762.025545] Console: switching to colour frame buffer device 480x135
[  772.264721] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  782.504548] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:299:DP-2] flip_done timed out
[  792.744729] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:92:plane 1B] flip_done timed out
[  802.984732] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  803.027647] Console: switching to colour dummy device 80x25
[  803.027689] [IGT] core_setmaster_vs_auth: executing
[  803.030500] [IGT] core_setmaster_vs_auth: exiting, ret=0
[  803.030693] Setting dangerous option reset - tainting kernel
[  813.224765] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  823.464762] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:299:DP-2] flip_done timed out
[  833.704761] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:92:plane 1B] flip_done timed out
[  843.944773] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  854.184744] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  864.424750] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:299:DP-2] flip_done timed out
[  874.664811] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:92:plane 1B] flip_done timed out
[  884.904737] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  884.905623] Console: switching to colour frame buffer device 480x135
[  895.144712] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  905.384736] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:299:DP-2] flip_done timed out
[  915.624734] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:92:plane 1B] flip_done timed out
[  925.864747] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:152:pipe B] flip_done timed out
[  925.908414] Console: switching to colour dummy device 80x25
[  925.908477] [IGT] debugfs_test: executing
[  925.911477] [IGT] debugfs_test: starting subtest read_all_entries
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