[Bug 60643] [i915] black screen at boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60643

--- Comment #12 from Jani Nikula <jani.nikula at intel.com> ---
>From the log:
[    0.000000] Command line: root=/dev/sda8 vga=0x0f04 drm.debug=0xe
i.e. you don't have acpi_osi or acpi_backlight set.

Let's focus on *one* thing at a time. Please try:

1) I915_KMS=y. Do not attach logs for KMS=n.

2) Do *not* load fglrx. Do not attach logs with fglrx loaded.

3a) What happens with acpi_osi="!Windows 2012"

3b) What happens with acpi_backlight=vendor

i.e. *either* of the parameters, *not* both.

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