[Bug 75791] i915: backlight turns off during boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=75791

--- Comment #9 from mcy at lm7.fr ---
(In reply to Jani Nikula from comment #8)
> Please attach /sys/kernel/debug/dri/0/i915_opregion

Hum, /sys/kernel/debug is empty. Do I have to add another boot parameter to the
kernel or something? I tried adding "debug" but then it won't boot (it stays
blocked right before the moment it should ask for my LUKS passphrase).


> What do you have in /sys/class/backlight in the working 3.13 kernel?

$ ls -l /sys/class/backlight
total 0
lrwxrwxrwx 1 root root 0 mai 12 13:14 intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight
$ tree /sys/class/backlight/intel_backlight
/sys/class/backlight/intel_backlight
├── actual_brightness
├── bl_power
├── brightness
├── device -> ../../card0-LVDS-1
├── max_brightness
├── power
│   ├── async
│   ├── autosuspend_delay_ms
│   ├── control
│   ├── runtime_active_kids
│   ├── runtime_active_time
│   ├── runtime_enabled
│   ├── runtime_status
│   ├── runtime_suspended_time
│   └── runtime_usage
├── subsystem -> ../../../../../../../class/backlight
├── type
└── uevent

3 directories, 15 files

(It is the exact same output with 3.14.3.)

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