Hi, I'm experiencing a weird behavior whenever I have an iPhone connected via USB to my laptop: It looks like the power source is getting toggled on and off / battery is resets/refreshs. This behavior repeats itself every 6 seconds (exactly) as long as the iPhone is connected. Some things I noticed: 1. No data is sent between the phone and the computer (sniffed USB bus using Beagle). 2. No events in dmesg 3. No events in udev 4. Same behavior doesn't occur with other Phones (Androids) 5. It happens with all iPhones I've tested with (iPhone 7, 8, X, XR and XS), with different iOS versions installed and also in Recovery Mode. 6. It happens regardless of whether the computer is connected to AC and whether the phone is connected directly to the computer or through a powered-hub. 7. I've ruled out issues related to the iPhone's power consumption by comparing the actual mA output on the port when the phone is connected compared to other devices.
upower --monintor displays repeating lines containing: [09:22:41.312] device changed: /org/freedesktop/UPower/devices/line_power_AC [09:22:41.313] device changed: /org/freedesktop/UPower/devices/battery_BAT0 [09:22:41.316] device changed: /org/freedesktop/UPower/devices/battery_BAT1 [09:22:42.402] daemon changed: (full logs (including --monitor-detail) are available in https://gist.github.com/guyru/d9d06a623d599fdeaf7ef8d58d3b9623) (each of these lines repeats multiple times). If I disable UPower completely: $ sudo mv /lib/systemd/system/upower.service{,.disabled} && sudo systemctl daemon-reload the weird behavior disappears, which makes me think (given all the other ruled out options) that the issue is with UPower. However, disabling UPower on a laptop seems like not a good long term solution to this issue. My system: 4.19.0-6-amd64, Lenovo ThinkPad T470, Debian 10, upower 0.99.10-1 I'll really appreciate any suggestions to what the issue may be, or further tips to investigate as this issue is very annoying to me. Thanks, Guy
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