FS#79728 - [linux] Suspend (S0ix) fails w/ FM350-GL WWAN modem installed

Attached to Project: Arch Linux
Opened by Thilo-Alexander Ginkel (thilo.ginkel) - Monday, 18 September 2023, 10:07 GMT
Last edited by Jan Alexander Steffens (heftig) - Thursday, 21 September 2023, 19:52 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Jan Alexander Steffens (heftig)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:

I use a ThinkPad P1 Gen 5 with a built-in Fibocom FM350-GL WWAN modem that utilizes a Mediatek t7xx chipset:

08:00.0 Wireless controller [0d40]: MEDIATEK Corp. Device 4d75 (rev 01)

Unfortunately, when the device is enabled in UEFI, suspend (S0ix) fails:

[51260.490016] mtk_t7xx 0000:08:00.0: [PM] SAP suspend error: -110
[51260.490070] mtk_t7xx 0000:08:00.0: PM: pci_pm_suspend(): t7xx_pci_pm_suspend+0x0/0x20 [mtk_t7xx] returns -110
[51260.490168] mtk_t7xx 0000:08:00.0: PM: dpm_run_callback(): pci_pm_suspend+0x0/0x170 returns -110
[51260.490196] mtk_t7xx 0000:08:00.0: PM: failed to suspend async: error -110
[51260.490381] PM: Some devices failed to suspend, or early wake event detected

The bugfix for this is already in netdev-next: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/patch/?id=ba2274dcfda859b8a27193e68ad37bfe4da28ddc

I verified that it works on my machine by applying it to an Arch Linux 6.5.2 kernel. Would it be possible to backport this fix?

Thanks,
Thilo
This task depends upon

Closed by  Jan Alexander Steffens (heftig)
Thursday, 21 September 2023, 19:52 GMT
Reason for closing:  Fixed
Additional comments about closing:  linux 6.5.4.arch2-1
Comment by Thilo-Alexander Ginkel (thilo.ginkel) - Tuesday, 19 September 2023, 21:16 GMT
Addendum: I verified that the patch cleanly applies against 6.5.3 and still works as intended.

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