Hmm. I'm having the same issue on my early 2009 MBP 17. I had backlight controls under 10.13 before upgrading to 10.13.1, and repatching. I can adjust brightness of my cinema display, just not the internal. Actually, it seemed to work fine in 10.13.1 for a few days before I realized I hadn't reapplied the patches and rebuilt the cache.
Also, NightShift seems to have disappeared, as well.
Update: Okay, switching to discrete graphics brings back the Built-in Display brightness slider, and brightness keys, but it's non-functional.
Update 2: It's a little fiddly. I went back to the installer and did a post install patch again, thinking maybe it would install a prior version of the patch, which I presume it did, but while the control is still visible, it's non functional. However, NightShift has now reappeared and works. I'm presuming MBP5,2 might need an updated backlight patch? If there's anything I can provide that would help to create that, I'm game.
Also, NightShift seems to have disappeared, as well.
Update: Okay, switching to discrete graphics brings back the Built-in Display brightness slider, and brightness keys, but it's non-functional.
Update 2: It's a little fiddly. I went back to the installer and did a post install patch again, thinking maybe it would install a prior version of the patch, which I presume it did, but while the control is still visible, it's non functional. However, NightShift has now reappeared and works. I'm presuming MBP5,2 might need an updated backlight patch? If there's anything I can provide that would help to create that, I'm game.
I have now even reinstalled the patched macOS version, force rebuilt cache, installed your latest backlight patch update but still no luck on the MacBook pro 17" Early 2009
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