http://bugzilla.kernel.org/show_bug.cgi?id=12174





------- Comment #16 from m.he...@gmx.net  2009-02-11 13:36 -------
Thomas:
I tried 2.6.29-rc4, doesn't work.

#  cat /proc/dri/0/i915_gem_interrupt
Interrupt enable:    00000053
Interrupt identity:  00000000
Interrupt mask:      fffedfae
Pipe A stat:         00000000
Pipe B stat:         00400206
Interrupts received: 318
Current sequence:    0
Waiter sequence:     0
IRQ sequence:        0

# cat /proc/acpi/video/GFX0/DD04/brightness
levels:  10 20 35 50 65 85
current: 85

# echo 10 > /proc/acpi/video/GFX0/DD04/brightness

#  cat /proc/dri/0/i915_gem_interrupt
Interrupt enable:    00000053
Interrupt identity:  00000000
Interrupt mask:      fffedfae
Pipe A stat:         00000000
Pipe B stat:         00400206
Interrupts received: 318
Current sequence:    0
Waiter sequence:     0
IRQ sequence:        0

With
CONFIG_DRM_I915=y


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