With debug enabled on drm module:

Mar 31 10:21:31 laptop kernel: [84734.181641] [drm:drm_ioctl] pid=7268, cmd=0x4004644d, nr=0x4d, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181658] [drm:drm_ioctl] pid=7268, cmd=0x40086414, nr=0x14, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181664] [drm:gm45_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0
Mar 31 10:21:31 laptop kernel: [84734.181669] [drm:drm_irq_uninstall] irq=2298
Mar 31 10:21:31 laptop kernel: [84734.181687] [drm:drm_ioctl] pid=7268, cmd=0xc0046444, nr=0x44, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181692] [drm:i915_emit_irq]
Mar 31 10:21:31 laptop kernel: [84734.181695] [drm:drm_ioctl] pid=7268, cmd=0x40046445, nr=0x45, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181700] [drm:i915_wait_irq] irq_nr=27262619 breadcrumb=27262619
Mar 31 10:21:31 laptop kernel: [84734.181869] [drm:drm_ioctl] pid=7268, cmd=0x40186443, nr=0x43, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181873] [drm:i915_batchbuffer] i915 batchbuffer, start 787000 used 8 cliprects 0
Mar 31 10:21:31 laptop kernel: [84734.181879] [drm:drm_ioctl] pid=7268, cmd=0xc0046444, nr=0x44, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181882] [drm:i915_emit_irq]
Mar 31 10:21:31 laptop kernel: [84734.181960] [drm:drm_ioctl] pid=7268, cmd=0xc0046444, nr=0x44, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181964] [drm:i915_emit_irq]
Mar 31 10:21:31 laptop kernel: [84734.181968] [drm:drm_ioctl] pid=7268, cmd=0x40046445, nr=0x45, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.181971] [drm:i915_wait_irq] irq_nr=27262622 breadcrumb=27262622
Mar 31 10:21:31 laptop kernel: [84734.181978] [drm:drm_ioctl] pid=7268, cmd=0x4004644d, nr=0x4d, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.519972] [drm:drm_ioctl] pid=7268, cmd=0x4004644d, nr=0x4d, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.519979] [drm:drm_ioctl] pid=7268, cmd=0x40086408, nr=0x08, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.519985] [drm:drm_vblank_get] enabling vblank on crtc 1, ret: 0
Mar 31 10:21:31 laptop kernel: [84734.519988] [drm:drm_update_vblank_count] enabling vblank interrupts on crtc 1, missed 20
Mar 31 10:21:31 laptop kernel: [84734.550387] [drm:drm_ioctl] pid=7268, cmd=0x4004644d, nr=0x4d, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.762731] [drm:drm_ioctl] pid=7268, cmd=0xc0046444, nr=0x44, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.762736] [drm:i915_emit_irq]
Mar 31 10:21:31 laptop kernel: [84734.762740] [drm:drm_ioctl] pid=7268, cmd=0x40046445, nr=0x45, dev 0xe200, auth=1
Mar 31 10:21:31 laptop kernel: [84734.762744] [drm:i915_wait_irq] irq_nr=27262623 breadcrumb=27262623
Mar 31 10:21:31 laptop kernel: [84734.938756] [drm:drm_vm_close] 0xa278b000,0x009c7000
Mar 31 10:21:31 laptop kernel: [84734.938761] [drm:drm_vm_close] 0xa3152000,0x009c7000
Mar 31 10:21:31 laptop kernel: [84734.938764] [drm:drm_vm_close] 0xa3b19000,0x009c7000
Mar 31 10:21:31 laptop kernel: [84734.938770] [drm:drm_vm_close] 0xa49cb000,0x02000000
Mar 31 10:21:31 laptop kernel: [84734.938773] [drm:drm_vm_close] 0xa69cb000,0x009c7000
Mar 31 10:21:31 laptop kernel: [84734.938794] [drm:drm_vm_shm_close] 0xb79b8000,0x00002000
Mar 31 10:21:31 laptop kernel: [84734.938823] [drm:drm_vm_shm_close] 0xb8078000,0x00002000
Mar 31 10:21:31 laptop kernel: [84734.953060] [drm:drm_fasync] fd = -1, device = 0xe200
Mar 31 10:21:31 laptop kernel: [84734.953065] [drm:drm_release] open_count = 2
Mar 31 10:21:31 laptop kernel: [84734.953068] [drm:drm_release] pid = 7268, device = 0xe200, open_count = 2
Mar 31 10:21:31 laptop kernel: [84734.953072] [drm:drm_release] File f5069540 released, freeing lock for context 1
Mar 31 10:21:31 laptop kernel: [84734.953080] [drm:drm_release] open_count = 1
Mar 31 10:21:31 laptop kernel: [84734.953082] [drm:drm_release] pid = 7268, device = 0xe200, open_count = 1
Mar 31 10:21:31 laptop kernel: [84734.953085] [drm:drm_lastclose]
Mar 31 10:21:31 laptop kernel: [84734.953094] [drm:drm_lastclose] driver lastclose completed
Mar 31 10:21:31 laptop kernel: [84734.953108] [drm:drm_lastclose] lastclose completed
(X restarts)