linux-kernel - Re: usb hotplug broken on v6.5.12

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Message-ID: <6f9218da-3fd0-a765-6515-e75ed9dd6978@redhat.com>
Date:   Tue, 28 Nov 2023 15:44:15 +0100 (CET)
From:   Sebastian Ott <sebott@...hat.com>
To:     Mario Limonciello <mario.limonciello@....com>
cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: usb hotplug broken on v6.5.12

On Tue, 28 Nov 2023, Mario Limonciello wrote:
> On 11/28/2023 07:12, Sebastian Ott wrote:
>>  usb hotplug doesn't work for me running stable kernel v6.5.12 on an AMD
>>  based Thinkpad t495s. Bisect pointed to 7b8ae3c24ef ("xhci: Loosen RPM as
>>  default policy to cover for AMD xHC 1.1") - which is 4baf1218150 upstream.
>>
>>  Reverting that from 6.5.12 fixes the issue for me.
>>  Current upstream rc kernel contains this patch but doesn't show the issue.
>> 
> I believe it's the same discussion as 
> https://lore.kernel.org/stable/5993222.lOV4Wx5bFT@natalenko.name/#t
>
> The outcome was that another missing patch is in the stable queue for various 
> kernels and will be part of the next stable release for various kernels.

Great, thank you!
I can confirm that v6.5.12 + a5d6264b ("xhci: Enable RPM on controllers that support low-power states")
fixes the issue for me.

Sebastian