WARNING: at drivers/gpu/drm/i915/intel_display.c:5374 ironlake_crtc_mode_set+0x877/0x8a0 [i915]()
 Apr 10 18:53:32 scrooge kernel: Hardware name: MacBookAir5,2
 Apr 10 18:53:32 scrooge kernel: Modules linked in: rfcomm bnep nls_cp437 arc4 vfat fat coretemp brcmsmac kvm_intel cordic brcmutil kvm mac80211 cfg80211
 Apr 10 18:53:32 scrooge kernel:  firewire_ohci firewire_core crc_itu_t ohci_hcd ehci_pci ehci_hcd xhci_hcd usbcore usb_common i915 video button i2c_algo_bit intel_agp intel_gtt dr
 Apr 10 18:53:32 scrooge kernel: Pid: 1657, comm: X Not tainted 3.8.6-1-ARCH #1
 Apr 10 18:53:32 scrooge kernel: Call Trace:
 Apr 10 18:53:32 scrooge kernel:  [<ffffffff81057190>] warn_slowpath_common+0x70/0xa0
 Apr 10 18:53:32 scrooge kernel:  [<ffffffff8105727a>] warn_slowpath_null+0x1a/0x20
 Apr 10 18:53:32 scrooge kernel:  [<ffffffffa00bb957>] ironlake_crtc_mode_set+0x877/0x8a0 [i915]
 Apr 10 18:53:32 scrooge kernel:  [<ffffffffa00bfce5>] intel_set_mode+0x5b5/0x940 [i915]
 Apr 10 18:53:32 scrooge kernel:  [<ffffffffa00c084e>] intel_crtc_set_config+0x6de/0x900 [i915]
 Apr 10 18:53:32 scrooge kernel:  [<ffffffffa0020a29>] drm_mode_setcrtc+0x549/0x5b0 [drm]
 Apr 10 18:53:32 scrooge kernel:  [<ffffffffa00111e1>] drm_ioctl+0x4c1/0x570 [drm]
 Apr 10 18:53:32 scrooge kernel:  [<ffffffffa00204e0>] ? drm_mode_setplane+0x380/0x380 [drm]
 Apr 10 18:53:32 scrooge kernel:  [<ffffffff81199775>] do_vfs_ioctl+0x2e5/0x4d0
 Apr 10 18:53:32 scrooge kernel:  [<ffffffff811999e1>] sys_ioctl+0x81/0xa0
 Apr 10 18:53:32 scrooge kernel:  [<ffffffff814c735d>] system_call_fastpath+0x1a/0x1f
 Apr 10 18:53:32 scrooge kernel: ---[ end trace 6a735a2323322eb0 ]---


 Apr 10 18:53:33 scrooge kernel: [drm:ivb_manual_fdi_link_train] *ERROR* FDI train 1 fail!
 Apr 10 18:53:33 scrooge kernel: [drm:ivb_manual_fdi_link_train] *ERROR* FDI train 2 fail!