[LG G5 ROMs, Kernels, Recoveries, & Other Developme] Ascii3:
EDIT: The problem described herein was not a problem with the ROM, but a single defective device. The post is left for reference as a proof of concept of electromagnetic interference.

[MENTION=2881807]x86cpu[/MENTION] - The issue I had reported in the past and quoted herein still manifests with lineage-15.1-20200506-X86CPU-rs988.zip. Do note, however, that in my original report of the problem, I referred to signal and signal level when trying to describe the "Mobile data" icon and its changes. As described later in this post, the "Mobile data" icon might not truly refer to signal level or signal, but rather something that incorporates both signal and noise.

I have made a video and provide a text file with times of various activities, such as removing or installing a USB 3.0 cable connection, and have attached a ZIP 2.0 archive to this post ("RS988_LineageOS_15.1_Trouble_Demo_Video.zip ") containing them. I also created an Android Bug Report, but have not attached it (let me know if it would really be important).

I found it interesting that the status bar "Mobile data" icon can appear rather empty or change much more radically than the signal power level expressed numerically. My impression is that the "Mobile data" icon does not simply illustrate signal power; I believe that electronic noise is also incorporated. The "Mobile data" icon perhaps indicates the cellular mobile data Signal Power to Noise ratio level or Signal to Noise ratio level.

I have also tried to see if the problem would manifest with a USB 2.0 connection by using a USB 2.0 cable in the USB 3.0 controller, and the problem did NOT manifest. My guess is that USB 3.0 hardware in the LG G5 RS988 may be providing relatively large electromagnetic noise or that the different power requirements for various USB versions may not be well managed.

EDIT: It appears that the problem manifests much more when the LG G5 RS988 is positioned horizontally, and not so much when positioned vertically. For the video demonstration, the LG G5 RS988 is laid horizontally.

I do note that the problem does NOT appear to manifest on LG G5 RS988.USA stock RS98821d firmware's ROM.

Also note: Intel Corporation has a PDF white paper describing USB 3.0 frequency interference upon 2.4GHz Wireless devices. The white paper is described at and available for download:

https://www.intel.com/content/www/u...al-bus/usb3-frequency-interference-paper.html

The white paper PDF document's XREF table is defective and the PDF may not display correctly. I have corrected the problem and attached a ZIP 2.0 archive with the corrected file ("usb3-frequency-interference-papers_PDF_ERRORS_FIXED.zip") to this post also.

The Intel Corporation white paper is specifically regarding interference on 2.4GHz wireless devices, yet, after examining the "T-Mobile network frequencies & technology" table provided at https://www.t-mobile.com/support/coverage/t-mobile-network , I find no 2G, 3G, or 4G related bands that are ~2.4 GHz. My impression, after examining the graph on page 8 of the PDF white paper, is that USB 3.0 high noise interference is not limited to about 2.4 GHz, and that typical 2G, 3G, or 4G USA cellular bands are likely more affected than the ~2.4 GHz bands.

[MENTION=2881807]x86cpu[/MENTION] - Please let me know what is your opinion of the problem and what can be done to fix it.