This test "igt@kms_plane_lowres@pipe-a-tiling-none" failure occurred only once, drmtip_61 (5 months / 2543 runs ago).

I assume this bug has been fixed and closing this bug.

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_190/fi-snb-2600/igt@kms_plane_lowres@pipe-b-tiling-none.html
Starting subtest: pipe-B-tiling-none
(kms_plane_lowres:1461) igt_kms-CRITICAL: Test assertion failure function do_display_commit, file ../lib/igt_kms.c:3320:
(kms_plane_lowres:1461) igt_kms-CRITICAL: Failed assertion: ret == 0
(kms_plane_lowres:1461) igt_kms-CRITICAL: Last errno: 22, Invalid argument
(kms_plane_lowres:1461) igt_kms-CRITICAL: error: -22 != 0
Subtest pipe-B-tiling-none failed.
**** DEBUG ****
(kms_plane_lowres:1461) INFO: Testing connector VGA-1 using pipe B
(kms_plane_lowres:1461) DEBUG: Test requirement passed: !(!igt_display_has_format_mod(&data->display, DRM_FORMAT_XRGB8888, modifier))
(kms_plane_lowres:1461) igt_kms-DEBUG: display: VGA-1: set_pipe(B)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: VGA-1: Selecting pipe B
(kms_plane_lowres:1461) igt_fb-DEBUG: igt_create_fb_with_bo_size(width=1024, height=768, format=0x34325258, tiling=0x0, size=0)
(kms_plane_lowres:1461) igt_fb-DEBUG: igt_create_fb_with_bo_size(handle=1, pitch=4096)
(kms_plane_lowres:1461) ioctl_wrappers-DEBUG: Test requirement passed: igt_has_fb_modifiers(fd)
(kms_plane_lowres:1461) igt_fb-DEBUG: Test requirement passed: cairo_surface_status(fb->cairo_surface) == CAIRO_STATUS_SUCCESS
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.0: plane_set_fb(111)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.0: plane_set_size (1024x768)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.0: fb_set_position(0,0)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.0: fb_set_size(1024x768)
(kms_plane_lowres:1461) DEBUG: Test requirement passed: !(!igt_plane_has_format_mod(plane, plane_format, plane_modifier))
(kms_plane_lowres:1461) igt_fb-DEBUG: igt_create_fb_with_bo_size(width=256, height=256, format=0x34325258, tiling=0x0, size=0)
(kms_plane_lowres:1461) igt_fb-DEBUG: igt_create_fb_with_bo_size(handle=2, pitch=1024)
(kms_plane_lowres:1461) ioctl_wrappers-DEBUG: Test requirement passed: igt_has_fb_modifiers(fd)
(kms_plane_lowres:1461) igt_fb-DEBUG: Test requirement passed: cairo_surface_status(fb->cairo_surface) == CAIRO_STATUS_SUCCESS
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.1: plane_set_position(0,512)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.1: plane_set_fb(114)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.1: plane_set_size (256x256)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.1: fb_set_position(0,0)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.1: fb_set_size(256x256)
(kms_plane_lowres:1461) DEBUG: Test requirement passed: !(!igt_plane_has_format_mod(plane, plane_format, plane_modifier))
(kms_plane_lowres:1461) igt_fb-DEBUG: igt_create_fb_with_bo_size(width=64, height=64, format=0x34325241, tiling=0x0, size=0)
(kms_plane_lowres:1461) igt_fb-DEBUG: igt_create_fb_with_bo_size(handle=3, pitch=256)
(kms_plane_lowres:1461) ioctl_wrappers-DEBUG: Test requirement passed: igt_has_fb_modifiers(fd)
(kms_plane_lowres:1461) igt_fb-DEBUG: Test requirement passed: cairo_surface_status(fb->cairo_surface) == CAIRO_STATUS_SUCCESS
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.2: plane_set_position(0,704)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.2: plane_set_fb(115)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.2: plane_set_size (64x64)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.2: fb_set_position(0,0)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: B.2: fb_set_size(64x64)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: commit {
(kms_plane_lowres:1461) igt_kms-DEBUG: Pipe A: Setting property "MODE_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: Pipe A: Setting property "ACTIVE" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     populating plane data: A.0, fb 0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "SRC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "SRC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "SRC_W" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "SRC_H" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "CRTC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "CRTC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "CRTC_W" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "CRTC_H" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "FB_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "CRTC_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.0: Setting property "rotation" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     populating plane data: A.1, fb 0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "SRC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "SRC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "SRC_W" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "SRC_H" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "CRTC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "CRTC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "CRTC_W" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "CRTC_H" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "FB_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "CRTC_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "rotation" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "COLOR_ENCODING" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.1: Setting property "COLOR_RANGE" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     populating plane data: A.2, fb 0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "SRC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "SRC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "SRC_W" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "SRC_H" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "CRTC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "CRTC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "CRTC_W" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "CRTC_H" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "FB_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "CRTC_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane A.2: Setting property "rotation" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: Pipe B: Setting property "MODE_ID" to 0x45/69
(kms_plane_lowres:1461) igt_kms-DEBUG: Pipe B: Setting property "ACTIVE" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     populating plane data: B.0, fb 111
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "SRC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "SRC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "SRC_W" to 0x4000000/67108864
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "SRC_H" to 0x3000000/50331648
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "CRTC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "CRTC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "CRTC_W" to 0x400/1024
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "CRTC_H" to 0x300/768
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "FB_ID" to 0x6f/111
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "CRTC_ID" to 0x35/53
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.0: Setting property "rotation" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     populating plane data: B.1, fb 114
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "SRC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "SRC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "SRC_W" to 0x1000000/16777216
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "SRC_H" to 0x1000000/16777216
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "CRTC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "CRTC_Y" to 0x200/512
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "CRTC_W" to 0x100/256
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "CRTC_H" to 0x100/256
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "FB_ID" to 0x72/114
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "CRTC_ID" to 0x35/53
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "rotation" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "COLOR_ENCODING" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.1: Setting property "COLOR_RANGE" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     populating plane data: B.2, fb 115
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "SRC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "SRC_Y" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "SRC_W" to 0x400000/4194304
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "SRC_H" to 0x400000/4194304
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "CRTC_X" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "CRTC_Y" to 0x2c0/704
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "CRTC_W" to 0x40/64
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "CRTC_H" to 0x40/64
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "FB_ID" to 0x73/115
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "CRTC_ID" to 0x35/53
(kms_plane_lowres:1461) igt_kms-DEBUG: plane B.2: Setting property "rotation" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     VGA-1: preparing atomic, pipe: B
(kms_plane_lowres:1461) igt_kms-DEBUG: VGA-1: Setting property "CRTC_ID" to 0x35/53
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     HDMI-A-1: preparing atomic, pipe: None
(kms_plane_lowres:1461) igt_kms-DEBUG: HDMI-A-1: Setting property "CRTC_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: HDMI-A-1: Setting property "Broadcast RGB" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     DP-1: preparing atomic, pipe: None
(kms_plane_lowres:1461) igt_kms-DEBUG: DP-1: Setting property "CRTC_ID" to 0x0/0
(kms_plane_lowres:1461) igt_kms-DEBUG: DP-1: Setting property "Broadcast RGB" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: display: }
(kms_plane_lowres:1461) igt_debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(kms_plane_lowres:1461) DEBUG: Test requirement passed: !(ret != 0)
(kms_plane_lowres:1461) igt_debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(kms_plane_lowres:1461) igt_debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(kms_plane_lowres:1461) igt_kms-DEBUG: Test requirement passed: !(file == NULL)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: VGA-1: set_pipe(B)
(kms_plane_lowres:1461) igt_kms-DEBUG: display: VGA-1: Selecting pipe B
(kms_plane_lowres:1461) igt_kms-DEBUG: display: commit {
(kms_plane_lowres:1461) igt_kms-DEBUG: Pipe B: Setting property "MODE_ID" to 0x42/66
(kms_plane_lowres:1461) igt_kms-DEBUG: Pipe B: Setting property "ACTIVE" to 0x1/1
(kms_plane_lowres:1461) igt_kms-DEBUG: display:     VGA-1: preparing atomic, pipe: B
(kms_plane_lowres:1461) igt_kms-DEBUG: VGA-1: Setting property "CRTC_ID" to 0x35/53
(kms_plane_lowres:1461) igt_kms-DEBUG: display: }
(kms_plane_lowres:1461) igt_kms-CRITICAL: Test assertion failure function do_display_commit, file ../lib/igt_kms.c:3320:
(kms_plane_lowres:1461) igt_kms-CRITICAL: Failed assertion: ret == 0
(kms_plane_lowres:1461) igt_kms-CRITICAL: Last errno: 22, Invalid argument
(kms_plane_lowres:1461) igt_kms-CRITICAL: error: -22 != 0
(kms_plane_lowres:1461) igt_core-INFO: Stack trace:
(kms_plane_lowres:1461) igt_core-INFO:   #0 ../lib/igt_core.c:1472 __igt_fail_assert()
(kms_plane_lowres:1461) igt_core-INFO:   #1 ../lib/igt_kms.c:3322 do_display_commit()
(kms_plane_lowres:1461) igt_core-INFO:   #2 ../lib/igt_kms.c:3425 igt_display_commit2()
(kms_plane_lowres:1461) igt_core-INFO:   #3 ../tests/kms_plane_lowres.c:240 test_plane_position_with_output()
(kms_plane_lowres:1461) igt_core-INFO:   #4 ../tests/kms_plane_lowres.c:271 test_plane_position()
(kms_plane_lowres:1461) igt_core-INFO:   #5 ../tests/kms_plane_lowres.c:284 run_tests_for_pipe()
(kms_plane_lowres:1461) igt_core-INFO:   #6 ../tests/kms_plane_lowres.c:321 __real_main303()
(kms_plane_lowres:1461) igt_core-INFO:   #7 ../tests/kms_plane_lowres.c:303 main()
(kms_plane_lowres:1461) igt_core-INFO:   #8 ../csu/libc-start.c:344 __libc_start_main()
(kms_plane_lowres:1461) igt_core-INFO:   #9 [_start+0x2a]
****  END  ****
Subtest pipe-B-tiling-none: FAIL (0.318s)

Dmesg-Warnings	
<3> [95.417087] [drm:ironlake_crtc_compute_clock [i915]] *ERROR* Couldn't find PLL settings for mode!

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