[Bug 77831] [bisected regression] no backlight control any more (MacBook4,1)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=77831

--- Comment #9 from Jani Nikula <jani.nikula at intel.com> ---
I don't think I've seen this before.

Jun 13 09:17:38 vt kernel: [   34.282877] [drm:intel_opregion_setup] graphic
opregion physical addr: 0x0
Jun 13 09:17:38 vt kernel: [   34.282879] [drm:intel_opregion_setup] ACPI
OpRegion not supported!

Jun 13 09:17:38 vt kernel: [   34.282945] i915 0000:00:02.0: Invalid ROM
contents
Jun 13 09:17:38 vt kernel: [   34.282947] [drm:intel_parse_bios] VBT signature
missing
Jun 13 09:17:38 vt kernel: [   34.282948] [drm] failed to find VBIOS tables

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