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[Bug 762855] Re: [sandybridge-m-gt2+] Display on external monitor (vga) is black on 13" MacBook Pro 8, 1 (x86_64)

 

dmesg shows:

[  527.569922] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 34739, at 34739], missed IRQ?
[ 1102.501179] aufs au_new_inode:412:system-config-p[3827]: Warning: Un-notified UDBA or repeatedly renamed dir, b1, squashfs, lib-dynload, hi14465, i536.
[ 1114.866872] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 235632, at 235632], missed IRQ?
[ 1117.817428] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 236168, at 236168], missed IRQ?
[ 1561.101313] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 306740, at 306740], missed IRQ?

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https://bugs.launchpad.net/bugs/762855

Title:
  [sandybridge-m-gt2+] Display on external monitor (vga) is black on 13"
  MacBook Pro 8,1 (x86_64)


References