[Bug 98289] [BDW] kms_flip / vblank-vs-suspend-interruptible is failing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98289

--- Comment #7 from Tomeu Vizoso <tomeu at tomeuvizoso.net> ---
Running this test on an APL machine here, I see this in dmesg:

[10968.960490] [drm:drm_handle_vblank] vblank event on 58648, current 58648
[10968.960502] [drm:vblank_disable_fn] disabling vblank on crtc 0
[10971.312512] [drm:edp_panel_vdd_off_sync] Turning eDP port A VDD off
[10971.312529] [drm:edp_panel_vdd_off_sync] PP_STATUS: 0x80000008 PP_CONTROL:
0x00000067
[11031.602616] perf: interrupt took too long (3200 > 3178), lowering
kernel.perf_event_max_sample_rate to 62000
[11121.589837] perf: interrupt took too long (4038 > 4000), lowering
kernel.perf_event_max_sample_rate to 49000
[11211.908147] PM: Syncing filesystems ... done.
...
[11212.918426] [drm:drm_handle_vblank] vblank event on 73245, current 73246


So after getting the vblank 58648 and right before suspending there's a big
delay of 244 seconds (11212 − 10968) that is accompanied of complaints by perf.

After resuming, we get a vblank of 73245 which roughly matches the previous
vblank count plus 244 * 60.

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