VBLANK_EVASION_TIME_US   78 drivers/gpu/drm/i915/display/intel_sprite.c #define VBLANK_EVASION_TIME_US 250
VBLANK_EVASION_TIME_US   80 drivers/gpu/drm/i915/display/intel_sprite.c #define VBLANK_EVASION_TIME_US 100