netdev - Re: Fwd: Intel 7560 LTE Modem stops working after resuming from standby

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Message-ID: <d1354343-8fe0-4338-8d71-b8a90c960017@gmail.com>
Date: Fri, 13 Oct 2023 06:57:33 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 Linux Regressions <regressions@...ts.linux.dev>,
 Linux Networking <netdev@...r.kernel.org>,
 Linux Intel Wireless WAN <linuxwwan@...el.com>
Cc: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>,
 "David S. Miller" <davem@...emloft.net>,
 Loic Poulain <loic.poulain@...aro.org>,
 Sergey Ryazanov <ryazanov.s.a@...il.com>,
 Johannes Berg <johannes@...solutions.net>
Subject: Re: Fwd: Intel 7560 LTE Modem stops working after resuming from
 standby

On 12/10/2023 16:52, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
>> I noticed a few days ago, after Fedora moved to Kernel 6.5, that my Intel LTE Modem was not working anymore after resuming from standby. 
>>
>> The journal listed this error message multiple times:
>> kernel: iosm 0000:01:00.0: msg timeout
>>
>> It took me a while to determine the root cause of the problem, since the modem did not work either in the following warm reboots. 
>> Only a shutdown revived the modem.
>>
>> I did a bisection of the error and I was able to find the culprit:
>>
>> [e4f5073d53be6cec0c654fac98372047efb66947] net: wwan: iosm: enable runtime pm support for 7560
> 
> See Bugzilla for the full thread.
> 
> Anyway, I'm adding this regression to regzbot:
> 
> #regzbot introduced: e4f5073d53be6c https://bugzilla.kernel.org/show_bug.cgi?id=217996
> #regzbot title: pm support for Intel 7560 makes the modem stops working after resume
> 

FYI, the reporter had uploaded full dmesg output on Bugzilla.
Also, he noted shutdown abnormality:

> also I should mention, that if this error occurs, I am unable to shutdown my system anymore. "poweroff" does not turn the laptop off, it simply triggers a reboot, where the modem is still not functional. Only pressing the powerbutton >4 secs "resets" the device.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara