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Message-ID: <2024082207-foothill-swirl-0ad0@gregkh>
Date: Thu, 22 Aug 2024 07:31:43 +0800
From: Greg KH <gregkh@...uxfoundation.org>
To: Paul Menzel <pmenzel@...gen.mpg.de>
Cc: linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mathias Nyman <mathias.nyman@...el.com>
Subject: Re: USB-C adapter like Dell DA300 using > 5 W
On Wed, Aug 21, 2024 at 11:32:04PM +0200, Paul Menzel wrote:
> Dear Linux folks,
>
>
> On the Intel Kaby Lake laptop Dell XPS 13 9360 with Debian sid/unstable and
> *powertop* 2.15-3, connecting a USB-C adapter like Dell DA300 or LMP USB-C
> mini Dock (P/N 15954) [1] and connecting only an Ethernet cable (module
> r8152 is used), the adapter gets very hot, and according to PowerTOP it uses
> over 5 Watts – almost more as the laptop idling.
>
> $ lsusb
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 001 Device 002: ID 0cf3:e300 Qualcomm Atheros Communications QCA61x4
> Bluetooth 4.0
> Bus 001 Device 003: ID 04f3:2234 Elan Microelectronics Corp. Touchscreen
> Bus 001 Device 004: ID 0c45:670c Microdia Integrated Webcam HD
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 003 Device 002: ID 2109:2820 VIA Labs, Inc. VL820 Hub
> Bus 003 Device 003: ID 06c4:c412 Bizlink International Corp. DELL DA300
> Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 004 Device 002: ID 2109:0820 VIA Labs, Inc. VL820 Hub
> Bus 004 Device 003: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153
> Gigabit Ethernet Adapter
>
> With `LANG= sudo powertop --auto-tune` it stays high.
>
> PowerTOP:
>
> ```
> The battery reports a discharge rate of 6.01 W
> The energy consumed was 146 J
> The estimated remaining time is 3 hours, 51 minutes
>
> Summary: 384.6 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and
> 8.5% CPU use
>
> Power est. Usage Events/s Category Description
> 5.94 W 0.0% Device Display backlight
> 5.23 W 100.0% Device USB device: USB
> Optical Mouse (Logitech)
> 4.62 W 66.1% Device USB device: USB
> 10/100/1000 LAN (Realtek)
> 205 mW 100.0% Device USB device: Fujitsu
> Keyboard (Fujitsu)
> 14.1 mW 13.5 ms/s 0.9 kWork intel_atomic_commit_work
> ```
>
> At another time:
>
> ```
> The battery reports a discharge rate of 10.5 W
> The energy consumed was 235 J
> The estimated remaining time is 2 hours, 20 minutes
>
> Summary: 395.8 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and
> 23.8% CPU use
>
> Power est. Usage Events/s Category Description
> 7.13 W 100.0% Device USB device: USB
> 10/100/1000 LAN (Realtek)
> 3.92 W 15.8% Device Display backlight
> 320 mW 0.0 us/s 0.00 Process [PID 1349]
> /usr/bin/pipewire
> 63.6 mW 65.4 ms/s 0.5 Process [PID 4982]
> /usr/lib/thunderbird/thunderbird
> 24.9 mW 25.6 ms/s 6.7 Process [PID 37753]
> /usr/lib/firefox-nightly/firefox-bin -contentproc -isForBrowser -prefsLen
> 36793 -prefMapSize 265654 -jsInitLe
> 14.7 mW 15.1 ms/s 0.5 kWork intel_atomic_commit_work
> ```
>
> The heat of the USB-C adapter might suggest, that it draws that much power.
> What is your experience? Can you suggest something?
Buy a different adapter? That seems like something is really wrong with
it. Does other devices also suck that much power from that port on the
laptop?
thanks,
greg k-h
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