"Assuming drive cache: write through" for all SATA drives since kernel 5.15.5

[juanejot]

How did you upgrade to 21.10? (Fresh install / Upgrade)

Upgrade

Related Application and/or Package Version (run apt policy $PACKAGE NAME):

Not specific that I can see, beyond system boot with kernel 5.15.5.

Issue/Bug Description:
Upon boot since upgrade to System76's kernel 5.15.5, I get the following two lines of notification at boot before it gets to a GUI. It still allows boot & function seems normal, so I'm not sure if it's a grave issue that needs addressing,* but just so the team knows.

The lines are:
[[amount of boot time in seconds]] sd 1:0:0:0 [sda] Asking for cache data failed
[[amount of boot time in seconds]] sd 1:0:0:0 [sda] Assuming drive cache: write through

Steps to reproduce (if you know):
Boot my old IC2D T9900/GeForce 9400M/9600M GT laptop with kernel 5.15.5.

Expected behavior:
Boot with no warnings.

Other Notes:
This may or may not be related to the SATA-reading difficulties with kernels 5.15.0 through 5.15.2, which were resolved in Ubuntu's kernel 5.15.3 and System76's kernels 5.15.4 and 5.15.5, as described in (closed) issue pop-os/beta#273. This drive cache warning did not happen in kernel 5.15.4 or previous, though I occasionally get USB warnings in all kernels (and USB works in all ways I can test, upon bootup).

*For System76 team members: Feel free to let me know if this is not a concern in running the system, and if that's the case, close the issue.

[jacobgkau]

Upstream kernel bug report: https://bugzilla.kernel.org/show_bug.cgi?id=215137

This should be fixed by 5.15.6: #85

I generally would not worry about dmesg entries as long as the system is functioning.

[juanejot]

Great, thanks @jacobgkau ! Closing issue now both due to work already being done on it & lack of concern due to system functionality.

[jacobgkau]

I am going to re-open this and move it to the Linux repo just for tracking (and just in case anyone else is looking for information about it.) Thank you for the report.

[juanejot]

Thank you @jacobgkau !