[PATCH v5 02/31] drm/i915: Don't register backlight when another backlight should be used (v2)

[Matthew Garrett]

On Tue, Oct 25, 2022 at 10:25:33PM +0200, Hans de Goede wrote:

> Having the native driver come and then go and be replaced
> with the vendor driver would also be quite inconvenient
> for these planned changes.

I understand that it would be inconvenient, but you've broken existing 
working setups.
 
> Can you perhaps explain a bit in what way your laptop
> is weird ?

It's a Chinese replacement motherboard for a Thinkpad X201, running my 
own port of Coreboot. Its DMI strings look like an actual Thinkpad in 
order to ensure that thinkpad_acpi can bind for hotkey suport, so it's 
hard to quirk. It'll actually be fixed by your proposed patch to fall 
back to native rather than vendor, but that patch will break any older 
machines that offer a vendor interface and don't have the native control 
hooked up (pretty sure at least the Thinkpad X40 falls into that 
category).