I used to suspend nicely with mga7, either via closing the lid or by suspending via the Gnome menu, but now it appears to do everything right including shutting off networking, but the notebook stays on (and after a while it resumes everything back, including network).
I'm currently using proprietary nvidia drivers back from the old installation (this is a system I installed on mga6).
I got some trace from the log but it seems related to TPM, but I'm unaware of some security configuration requiring the use of TPM in my system (maybe it's something on by default in mga8).
Is there any other thing I may look at to try to pinpoint the issue? I'm no expert in kernel internals...
Edit: outside of the trace I detected this error:
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Apr 7 10:12:46 palinxps15 kernel: [ 1111.143372] brcmfmac 0000:02:00.0: brcmf_pcie_pm_enter_D3: Timeout on response for entering D3 substate
Apr 7 10:12:46 palinxps15 kernel: [ 1111.143382] PM: pci_pm_suspend(): brcmf_pcie_pm_enter_D3+0x0/0x140 [brcmfmac] returns -5
Apr 7 10:12:46 palinxps15 kernel: [ 1111.143385] PM: dpm_run_callback(): pci_pm_suspend+0x0/0x160 returns -5
Apr 7 10:12:46 palinxps15 kernel: [ 1111.143387] PM: Device 0000:02:00.0 failed to suspend async: error -5
Apr 7 10:12:46 palinxps15 kernel: [ 1111.143581] PM: Some devices failed to suspend, or early wake event detected
Apr 7 10:12:46 palinxps15 kernel: [ 1111.468994] ata2: SATA link down (SStatus 4 SControl 300)
Apr 7 10:12:46 palinxps15 kernel: [ 1113.148157] tpm tpm0: tpm_try_transmit: send(): error -62
If I understand this well, the 0000:02:00.0 seems to be the Intel card or the broadcom card:
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# lspci
[...]
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
[...]
02:00.0 Network controller: Broadcom Inc. and subsidiaries BCM43602 802.11ac Wireless LAN SoC (rev 01)
[...]