Comment 202 for bug 1098216
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a60fb26
(Get the code!)
Created attachment 99751
Disable ACPI backlight for broken ThinkPads
I'm attaching a new patch with a different take on this problem. It just disables the ACPI backlight control on these machines whenever the kernel has indicated Windows 8 compatibility via _OSI.
Most machines should fall back to using a secondary backlight control, but it's possible that a few machines won't have another control. It's also likely that brightness changes on VTs using the hotkeys will be broken. In either of these cases it will be necessary to use acpi_osi="!Windows 2012", and I'd appreciate it if someone could test this case to verify the acpi_video backlight works as before with the new patch.
Please give it a whirl and let me know your results. I've included quirks for every machine I'm aware of which is broken, but if I've missed any please let me know and include DMI information.