[coreboot - Bug #634] mb/acer: Add TravelMate P633 series (Ivy Bridge / NPCE885PA0DX) misses battery and brightness

Issue #634 has been updated by Walter Sonius.


Brightness:
Update, although the code hasn't changed the Brightness/Dimming of the display "does work" but only by GUI slider (which can't reach 0% or off). 

During day light I also had a external display attached which fake dimmed using DDC (OSD on that external display remained at same brightness while picture got darker...) since I was not able to get the built-in screen 0% dark/off with slider (it does turn off with keyboard shortcut or timer) I had mistaken that brightness control was not working at all... But visually reaffirming and checking via power metering outlet I verified the screen gets off/darker/brighter. It uses around ~4,5 Watt full on and can be dimmed as low as ~1 Watt, or off 0 Watt.

I also forgot to the check the LID open/close status but the current code does not expose that to the OS as an option (what to do while if LID closes).

Accu/Battery LID:
Doing a `egrep -r -i NPCE` in the `src/mainboard` folder hinted me of maybe a related notebook `src/mainboard/51nb/x210/` although a newer skylake model which relies on a ec.bin file I tried to hack copy/paste some ec/acpi code of that NPCE985 together. Although I don't have a `ec.bin it gave me a LID function albeit broken (false reports it is closed) and it broke brightness functions maybe its just a lead for the battery? Still have to upload that patch.

ExpressCard Hotplug:
One other issue mentioned was that ExpressCard with a e-SATA chipset won't hotplug while other cards with ethernet, firewire or USB3 chipsets doe work fine after hotplugging. Will gather some lspci/dmesg logs about those specific 3 e-SATA cards soon.

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Bug #634: mb/acer: Add TravelMate P633 series (Ivy Bridge / NPCE885PA0DX) misses battery and brightness
https://ticket.coreboot.org/issues/634#change-2238

* Author: Walter Sonius
* Status: New
* Priority: Normal
* Target version: none
* Start date: 2026-03-04
* Affected versions: main
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Except for no detected battery nor working brightness controls almost everything else for this Acer TravelMate P633-M laptop seems to be working see autoport in commit base:
https://review.coreboot.org/c/coreboot/+/91512

Any hints for ACPI / battery / brightness and or EC (Nuvoton NPCE885PA0DX) to get improvements on this area?

See included OEM logs.

---Files--------------------------------
acer-travelmate-p633m-oem-logs.zip (420 KB)
cbmem1.log (48.4 KB)
cbmemt.log (2.27 KB)


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