Hi Colin:
My pleasure...
Mixed IAP environment... 105s, 215s, 225s.
Recently downloaded update from Maintenance > Firmware > Check For New Version. The version pulled down was 6.4.4.8-4.2.4.2_56164.
All 215s and 225s have been working with all green power LEDs for the last few years with all other firmware updates. Likewise, our 105s have been doing their thing.
With this update, the 3 225s connected to our two Cisco 2960-S LPS-L stacked switches decided to show amber power LEDs. Two connected to our HP 1920 PoE switch exhibit the same behavior. Two others connected to the 1920 do not. One 225 connected to an 8 port HP 1920 kept its green power LED. The 215s connected to the HP1920 remained green.
To make sure there wasn't a strange setting or anything in place in our IAP configuration, after hours I disconnected all IAPs from the Cisco switch. With an IAP225 in hand connected by a short 6 foot CAT6, I factory reset the unit. As expected, the unit reset to where "instant" was the only SSID and all our settings were removed. Factory default with updated firmware. I was hoping to see the power LED stay green to indicate maybe a setting in our IAP environment was the casue, but that wasn't the case. The factory default IAP225 still came up with the amber LED.
Although I've been running Cisco Firmware 15.0.2-SE(8) for a long while, I thought I'd see about going to the latest suggested firmware... 15.0.2-SE(10). There was no change.
The HPE 1920-24G-PoE+ (180W) Switch JG925A are also interesting. It's the only spot where a few of the 225s are coming up as expected (green LED). Notice I say... a few... not all. Whereas before, all came up green. I should also note the two 215s I have connected to these are green.
Firmware versions on the HP1920s are r1113 and r1112. I think r1112 is the current version available on the web. The unit with r1113 was a warranty replacement. I'd have to check to see which of the switches the IAP225s that are showing amber are connected.
The HPE 1920-8G-PoE+ (65W) Switch JG921A, running firmware version r1108 runs the IAP225 with green power LED.
I'd like to note that other than static IP address assignment, admin password, and fiber port link aggregation, these HP switches are pretty much running with out of the box configuration.
I hope that helps with environment, but everything was cruising right along until I updated to firmware 6.4.4.8-4.2.4.2_56164. So you'd have to make a real good case that it's on our side. :)