debcrafters-packages team mailing list archive

[Tony Hsiao <2126468@xxxxxxxxxxxxxxxxxx>]

** Tags added: jira-somerville-3203 oem-priority

** Merge proposal linked:
   https://code.launchpad.net/~snalvc/+git/systemd-hwe/+merge/493545

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https://bugs.launchpad.net/bugs/2126468

Title:
  Add Dell DW5826e WWAN modem to autosuspend

Status in OEM Priority Project:
  New
Status in systemd-hwe package in Ubuntu:
  New

Bug description:
  [ Impact ]

   * Systems with Dell DW5826e WWAN modems currently cannot benefit from
  USB autosuspend power management, preventing the processor from
  reaching deeper PC# states when the modem is idle.

   * Backporting upstream patch [1] that adds rules in
  hwdb.d/60-autosuspend.hwdb for Dell DW5826e WWAN modem

  [ Test Plan ]

   * DUT: Platform with Dell DW5826e WWAN modem

  $ lsusb -d 413c:8217
  Bus 004 Device 002: ID 413c:8217 Dell Computer Corp. DW5826e-eSIM Qualcomm Snapdragon X12 Global LTE-A
  $ cat /sys/bus/usb/devices/4-1/idVendor 
  413c
  $ cat /sys/bus/usb/devices/4-1/idProduct 
  8217

   1. Confirm autosuspend is not enabled before patch and is set to "on"
  in power/control

  $ cat /sys/bus/usb/devices/4-1/power/control 
  on

   2. Install patch
   3. Autosuspend is enabled, namely, set to "auto" in power/control

  $ cat power/control
  auto

  [ Where problems could occur ]

   * The modem might experience connection instability or fail to wake
  up properly from suspend.

  [ Other Info ]

   * [1] 60-autosuspend.hwdb: Add Dell DW5826e WWAN modem to
  autosuspend: https://github.com/systemd/systemd/pull/38685

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