Comment 144 for bug 1730924

== "mwifiex crash on idle/using"

I heard this issue only from Surface 3 and SP5 owners.
It can be fixed by disabling ASPM L1 state. I think this is the hardest issue to fix. So, I hope at least we could fix the mwifiex reset feature (see below).

== "mwifiex reset feature broken"

I think this issue is common on all devices that use the 88W8897 chip.
You can reproduce this issue by the following command:

        echo 1 | sudo tee /sys/kernel/debug/mwifiex/mlan0/reset

Expected: mwifiex is usable after this reset.
Actual: mwifiex is broke after this reset with following dmesg output

        $ echo 1 | sudo tee /sys/kernel/debug/mwifiex/mlan0/reset
        mwifiex_pcie 0000:03:00.0: Resetting per request
        mwifiex_pcie 0000:03:00.0: info: successfully disconnected from [BSSID]:
        reason code 3
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: info: shutdown mwifiex...
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: PREP_CMD: card is removed
        mwifiex_pcie 0000:03:00.0: WLAN FW already running! Skip FW dnld
        mwifiex_pcie 0000:03:00.0: WLAN FW is active
        mwifiex_pcie 0000:03:00.0: Unknown api_id: 4
        mwifiex_pcie 0000:03:00.0: info: MWIFIEX VERSION: mwifiex 1.0 (15.68.19.p21)
        mwifiex_pcie 0000:03:00.0: driver_version = mwifiex 1.0 (15.68.19.p21)
        mwifiex_pcie 0000:03:00.0: info: trying to associate to '[SSID]' bssid [BSSID]
        mwifiex_pcie 0000:03:00.0: info: associated to bssid [BSSID] successfully
        mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
        mwifiex_pcie 0000:03:00.0: info: successfully disconnected from [BSSID]:
        reason code 15
        mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        mwifiex_pcie 0000:03:00.0: cmd_wait_q terminated: -110
        mwifiex_pcie 0000:03:00.0: deleting the crypto keys
        [...]

Also, does anyone know what is the expected behavior on function level reset? Should firmware be re-downloaded? As you can see on the dmesg log, fw is still active after the reset. ("WLAN FW already running! Skip FW dnld")

== "power_save causes connection instability at least on 5GHz APs"

"connection instability" here means not crash, but networking stop, like ping not responding.

I think this issue is common on all devices that use the 88W8897 chip.

- You can mitigate this issue by showing APs continuously (nmcli d wifi list)
- Or you can prevent this issue by disabling power_save
  (sudo iw dev mlan0 set power_save off)