[LG V20 ROMs, Kernels, Recoveries, & Other Developm] Brophen:
Well I was way off lol shows what I know (spoiler: not much)

Here's what I get on first successful in logcat:

04-13 19:53:36.345 564 564 D ConsumerIrService: transmitting pattern at 38029 Hz
04-13 19:53:36.465 1016 2980 E ConsumerIrService: Error transmitting: -1
04-13 19:53:36.560 1982 1982 W DPMReceiver: type=1400 audit(0.0:173): avc: denied { write } for name="dpmd" dev="tmpfs" ino=19113 scontext=u:r:system_app:s0 tcontext=u:object_r:dpmd_socket:s0 tclass=sock_file permissive=0
04-13 19:53:36.563 1982 4975 I DPMJ : |REQ:RCVR| DPM creating socket
04-13 19:53:36.870 11027 11027 E ANDR-PERF-MPCTL: Unable to create control service (stage=2, rc=-1)
04-13 19:53:36.870 11027 11027 W libc : invalid pthread_t (0) passed to pthread_join
04-13 19:53:36.901 1 1 W libc : Unable to set property "ro.init.updatable_crashing_process_name" to "vendor.perfd": error code: 0xb
04-13 19:53:36.903 1 1 W libc : Unable to set property "ro.init.updatable_crashing" to "1": error code: 0xb

on fail:

04-13 19:54:19.937 564 564 D ConsumerIrService: transmitting pattern at 38029 Hz
04-13 19:54:20.659 1982 4975 I DPMJ : |REQ:RCVR| DPM creating socket
04-13 19:54:20.656 1982 1982 W DPMReceiver: type=1400 audit(0.0:184): avc: denied { write } for name="dpmd" dev="tmpfs" ino=19113 scontext=u:r:system_app:s0 tcontext=u:object_r:dpmd_socket:s0 tclass=sock_file permissive=0
04-13 19:54:22.036 11056 11056 E ANDR-PERF-MPCTL: Unable to create control service (stage=2, rc=-1)
04-13 19:54:22.036 11056 11056 W libc : invalid pthread_t (0) passed to pthread_join
04-13 19:54:22.064 1 1 W libc : Unable to set property "ro.init.updatable_crashing_process_name" to "vendor.perfd": error code: 0xb
04-13 19:54:22.072 1 1 W libc : Unable to set property "ro.init.updatable_crashing" to "1": error code: 0xb
04-13 19:54:22.093 1016 3518 D WificondControl: Scan result ready event
04-13 19:54:22.105 929 1856 I LOWI-8.5.0.1: [LOWI-Scan] lowi_close_record:Scan completed in 605577ms and Recieved 15 APs scan results
04-13 19:54:22.909 621 1022 D sensors_hal_Ctx: poll:polldata:5, sensor:1, type:1, x:0.747406 y:-0.066208 z:9.823563
04-13 19:54:22.911 621 1022 D sensors_hal_Util: waitForResponse: timeout=0
04-13 19:54:23.009 621 1022 D sensors_hal_Ctx: poll:polldata:5, sensor:1, type:1, x:1.120895 y:0.108566 z:9.818771
04-13 19:54:23.010 621 1022 D sensors_hal_Util: waitForResponse: timeout=0
04-13 19:54:23.046 564 564 E consumer_ir_driver: poll timeout !!

And again on fail:

04-13 19:55:17.965 564 564 D ConsumerIrService: transmitting pattern at 38029 Hz
04-13 19:55:18.098 578 578 W [email]android.hardware.power@1.1-service.lge.msm[/email]8996: perfd is not started
04-13 19:55:20.461 578 578 I chatty : uid=1000(system) power@1.1-servi identical 20 lines
04-13 19:55:20.461 578 578 W [email]android.hardware.power@1.1-service.lge.msm[/email]8996: perfd is not started
04-13 19:55:20.790 1982 4975 I DPMJ : |REQ:RCVR| DPM creating socket
04-13 19:55:20.788 1982 1982 W DPMReceiver: type=1400 audit(0.0:199): avc: denied { write } for name="dpmd" dev="tmpfs" ino=19113 scontext=u:r:system_app:s0 tcontext=u:object_r:dpmd_socket:s0 tclass=sock_file permissive=0
04-13 19:55:21.077 564 564 E consumer_ir_driver: poll timeout !!
04-13 19:55:21.192 564 564 D ConsumerIrService: transmitting pattern at 38029 Hz

I'll see if I get something different on Gamma