Hi, So I notice that the write_cache sysfs file seems to be broken for WCE (SBC) setting. First of all, "write back" gets rejected as "Invalid argument". On the other hand, while "write through" can be written to the file, it does not seem to actually change the WCE bit (as per sdparm reports). There's no new cache setting reporting kernel log either. However, reading the file after the write does give "write through". Nevertheless, the file does change accordingly when I set WCE to 0 or 1 with sdparm. I am reproducing this on 6.6.1. It seems that it at least affects the 6.1.x LTS branch as well though. (I can't tell for sure since for the latter I am using the raspberrypi tree.) Regards, Tom
