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From:   Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Date:   Fri, 26 Nov 2021 03:39:03 +0500
Message-ID: <CABXGCsMJOfGU8axS4FdGfPCgcPL5iuedpZxa4PETSyFHDckOAg@mail.gmail.com>
Subject: Re: [Bug] Driver mt7921e cause computer reboot.
To:     Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        sean.wang@mediatek.com,
        Linux List Kernel Mailing <linux-wireless@vger.kernel.org>,
        objelf@gmail.com, lorenzo@kernel.org, Soul.Huang@mediatek.com,
        nbd@nbd.name
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On Tue, 5 Oct 2021 at 01:40, Mikhail Gavrilov
<mikhail.v.gavrilov@gmail.com> wrote:
>

With recent kernel 5.16.0-0.rc2 commit 5d9f4cf36721 the behavior has
been changed for the better, but the WiFi adapter still works with
bugs.

Now spontaneous endless reboots do not occur. But if I restart the
laptop instead of shutting down, then the next time I boot, the WiFi
adapter disappears. In order for the WiFi adapter to appear again, it
needs to turn off the laptop and then turn on. Can this be somehow
fixed?
lspci output after reboot and boot after shutdown is different:

After reboot:
Subsystem: AzureWave Device 4680
Flags: fast devsel, IRQ 84, IOMMU group 14
Memory at fc30300000 (64-bit, prefetchable) [size=1M]
Memory at fc30400000 (64-bit, prefetchable) [size=16K]
Memory at fc30404000 (64-bit, prefetchable) [size=4K]
Capabilities: [80] Express Endpoint, MSI 00
Capabilities: [e0] MSI: Enable- Count=1/32 Maskable+ 64bit+
Capabilities: [f8] Power Management version 3
Capabilities: [100] Vendor Specific Information: ID=1556 Rev=1 Len=008 <?>
Capabilities: [108] Latency Tolerance Reporting
Capabilities: [110] L1 PM Substates
Capabilities: [200] Advanced Error Reporting
Kernel modules: mt7921e

After shutdown:
05:00.0 Network controller: MEDIATEK Corp. Device 7961
Subsystem: AzureWave Device 4680
Flags: bus master, fast devsel, latency 0, IRQ 85, IOMMU group 14
Memory at fc30300000 (64-bit, prefetchable) [size=1M]
Memory at fc30400000 (64-bit, prefetchable) [size=16K]
Memory at fc30404000 (64-bit, prefetchable) [size=4K]
Capabilities: [80] Express Endpoint, MSI 00
Capabilities: [e0] MSI: Enable+ Count=1/32 Maskable+ 64bit+
Capabilities: [f8] Power Management version 3
Capabilities: [100] Vendor Specific Information: ID=1556 Rev=1 Len=008 <?>
Capabilities: [108] Latency Tolerance Reporting
Capabilities: [110] L1 PM Substates
Capabilities: [200] Advanced Error Reporting
Kernel driver in use: mt7921e
Kernel modules: mt7921e

Screen of a visual comparison of lspci in meld: https://postimg.cc/642NKJ5Y

-- 
Best Regards,
Mike Gavrilov.