[TLDR: I'm adding this regression to regzbot, the Linux kernel regression tracking bot; most text you find below is compiled from a few templates paragraphs some of you might have seen already.]

Hi, this is your Linux kernel regression tracker speaking.

Adding the regression mailing list to the list of recipients, as it should be in the loop for all regressions, as explained here: https://www.kernel.org/doc/html/latest/admin-guide/reporting-issues.html

CCing Greg and Stable as well, as it's a stable regression.

On 30.01.22 22:33, Kim Nilsson wrote:

I've recently been doing some suspend/resume testing related to an s2idle bug in amdgpu (https://gitlab.freedesktop.org/drm/amd/-/issues/1879) and I've come across some problems with C-states.

After resuming from s2idle, Pkg(HW) will no longer enter any state C2 or deeper. Suspending to s3 would not trigger this issue on 5.16.2, but after trying out 5.16.4 I'm facing a similar problem where Pkg(HW) will rarely if ever go deeper than C3. Now, the reason I am contacting you is because I was playing around today and found that unloading i2c-i801 seems to fix the issue.

Thanks for the report.

To be sure this issue doesn't fall through the cracks unnoticed, I'm adding it to regzbot, my Linux kernel regression tracking bot:

#regzbot ^introduced v5.16.2..v5.16.4 #regzbot title i2c: Possible ACPI bug/regression in i2c-i801 [plain text] #regzbot ignore-activity

Reminder: when fixing the issue, please add a 'Link:' tag with the URL to the report (the parent of this mail) using the kernel.org redirector, as explained in 'Documentation/process/submitting-patches.rst'. Regzbot then will automatically mark the regression as resolved once the fix lands in the appropriate tree. For more details about regzbot see footer.

Sending this to everyone that got the initial report, to make all aware of the tracking. I also hope that messages like this motivate people to directly get at least the regression mailing list and ideally even regzbot involved when dealing with regressions, as messages like this wouldn't be needed then.

Don't worry, I'll send further messages wrt to this regression just to the lists (with a tag in the subject so people can filter them away), as long as they are intended just for regzbot. With a bit of luck no such messages will be needed anyway.

# CPU: Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz # GPU: Intel Corporation WhiskeyLake-U GT2 [UHD Graphics 620], Advanced Micro Devices, Inc. [AMD/ATI] Lexa XT [Radeon PRO WX 3100] # 00:15.0 Serial bus controller: Intel Corporation Cannon Point-LP Serial IO I2C Controller #0 (rev 30) # 00:15.1 Serial bus controller: Intel Corporation Cannon Point-LP Serial IO I2C Controller #1 (rev 300:19.0 Serial bus controller: Intel Corporation Cannon Point-LP Serial IO I2C Host Controller (rev 30)

dmesg output when loading the module after an unload:

[ 1002.961091] i801_smbus 0000:00:1f.4: SPD Write Disable is set [ 1002.961171] i801_smbus 0000:00:1f.4: SMBus using PCI interrupt [ 1002.961321] iTCO_wdt iTCO_wdt: unable to reset NO_REBOOT flag, device disabled by hardware/BIOS [ 1002.975399] i801_smbus 0000:00:1f.4: Accelerometer lis3lv02d is present on SMBus but its address is unknown, skipping registration [ 1002.975406] i2c i2c-10: 2/2 memory slots populated (from DMI) [ 1002.976713] ee1004 10-0050: 512 byte EE1004-compliant SPD EEPROM, read-only [ 1002.976808] i2c i2c-10: Successfully instantiated SPD at 0x50

This is my first LKML bug report, so I could use some guidance in how to provide more information.

Ciao, Thorsten (wearing his 'Linux kernel regression tracker' hat)

P.S.: As a Linux kernel regression tracker I'm getting a lot of reports on my table. I can only look briefly into most of them. Unfortunately therefore I sometimes will get things wrong or miss something important. I hope that's not the case here; if you think it is, don't hesitate to tell me about it in a public reply, that's in everyone's interest.

BTW, I have no personal interest in this issue, which is tracked using regzbot, my Linux kernel regression tracking bot (https://linux-regtracking.leemhuis.info/regzbot/). I'm only posting this mail to get things rolling again and hence don't need to be CC on all further activities wrt to this regression.

--- Additional information about regzbot:

If you want to know more about regzbot, check out its web-interface, the getting start guide, and/or the references documentation:

https://linux-regtracking.leemhuis.info/regzbot/ https://gitlab.com/knurd42/regzbot/-/blob/main/docs/getting_started.md https://gitlab.com/knurd42/regzbot/-/blob/main/docs/reference.md

The last two documents will explain how you can interact with regzbot yourself if your want to.

Hint for reporters: when reporting a regression it's in your interest to tell #regzbot about it in the report, as that will ensure the regression gets on the radar of regzbot and the regression tracker. That's in your interest, as they will make sure the report won't fall through the cracks unnoticed.

Hint for developers: you normally don't need to care about regzbot once it's involved. Fix the issue as you normally would, just remember to include a 'Link:' tag to the report in the commit message, as explained in Documentation/process/submitting-patches.rst That aspect was recently was made more explicit in commit 1f57bd42b77c: https://git.kernel.org/linus/1f57bd42b77c