[Bug 81438] [945gm] no intel_backlight on macbook 2,1 with kernel 3.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81438

--- Comment #4 from yvan.masson at openmailbox.org ---
Hi,

After reverting the commit c675949ec58ca50d5a3ae3c757892f1560f6e896 on kernel
3.15.5 from kernel.org, boot fails on kernel panic with this message (I don't
know how to catch the kernel panic log, so I juste write the lines I think
interesting here) :

Code: .......
EIP: [<f878d93b>] __intel_set_cpu_fifo_underrun_reporting+0x2b/0x2d0 [i915]
SS:ESP 0068:f5407ef0
CR2: 000000000000088c
---[ end trace ... ]---
Kernel panic - not syncing: Fatal exception in interrupt
Kernel Offset: 0x0 from 0xc1000000 (relocation range: 0xc0000000-0xf81fdfff)
...

However, it also happens rarely an other kernel panic, but with no
"intelligible" message.

It makes me think of a similar message I have at boot with kernels 3.15.5 from
kernel.org and 3.16.1 from Debian :
[drm:i915_irq_handler] *ERROR* pipe A underrun
[drm:i915_irq_handler] *ERROR* pipe A underrun
[drm] GPU HANG: ecode -1:0x00000000, reason: Command parse error, iir
0x00008000, action: continue

I attach my kern.log : it includes boots with kernels 3.15.5 and 3.16.1

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