Public bug reported: [ 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 ** Affects: systemd-hwe (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2126468 Title: Add Dell DW5826e WWAN modem to autosuspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd-hwe/+bug/2126468/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
