Re: [BUG] wifi: rtw88: Hard system freeze on RTL8821CE when power_save is enabled (LPS/ASPM conflict)

[LB F]

Oleksandr Havrylov <goainwo@xxxxxxxxx> wrote:
> After extended testing with your DMI patch applied, the hard freeze is
> gone. However, with ASPM disabled but LPS Deep still active, I observe
> periodic h2c timeouts during idle which cause occasional WiFi throughput
> drops and Bluetooth audio stuttering. When I additionally set
> disable_lps_deep=Y, all symptoms disappear completely. This confirms
> that combining the ASPM quirk with dynamic LPS_DEEP_MODE_NONE would be
> the complete fix. Ready to test an updated patch if you decide to
> include this.

Hi Ping-Ke,

While monitoring logs with the current patch applied, I noticed two
things that might be useful.

First, the following message appears each time the driver loads:

  rtw88_8821ce 0000:13:00.0: can't disable ASPM; OS doesn't have ASPM control

This suggests the BIOS retains control over ASPM and prevents any
OS-level override via pci_disable_link_state(). The system remains
stable regardless, which confirms that the rtw_pci_disable_aspm flag
approach in your patch is the correct and effective method here.

Second, during normal operation I observe this warning periodically:

  WARNING: net/mac80211/rx.c:5491 at ieee80211_rx_list+0x177/0x1020 [mac80211]

This is the same location that appeared in the call trace just before
the hard freeze. You mentioned earlier that malformed RX data reaching
mac80211 could be a factor. I'm not sure if this warning is related,
but I wanted to flag it in case it is useful for your RX validation
investigation.

No h2c timeouts or firmware errors have been observed. The system
remains fully stable.

Best regards,
Oleksandr Havrylov