Hi Tejun, This is just FYI, but I thought it would be good to let you know about this given the adding and then removal of the NOLPM quirk for the SanDisk SD7UB3Q*G1001 SSDs. In the mean time I've had some more reports about people who's laptop hardfreezes about once 1 day when SATA LPM is enabled, with a wide array of different disks. The common denominator in these reports are: 1) It is a Lenovo 50 series laptop 2) The laptop is using the gold BIOS from early 2015 In the mean time I've gotten confirmation from 3 different users that updating the BIOS fixes the hangs. As mentioned in the commit message removing the NOLPM quirk, it seems that the hang is not directly related to LPM, but triggered by the uncore reaching deeper sleep states, which can only happen if LPM is enabled. Normally I'm not a fan of telling users that they need to upgrade their BIOS, but the alternative would be to disable LPM on all Lenovo 50 series laptops which is a much too big hammer IMHO. Note that the fwupd folks are working with Lenovo to get Lenovo BIOS updates supported under Linux through fwupd and people really should update their BIOS given all the recent Intel ME security issues. Hmm, thinking more about this one thing which we could do is have a dmi_match table with the gold (*) BIOS versions and disable LPM based on that together with a warning message that people should upgrade their BIOS ? This ain't pretty, but I think it might be worth it, what do you think of this ? Regards, Hans *) The GOLD version may not be the only version affected, but: 1) So far all reporters seem to be using the GOLD version (or what I believe is the gold version), which is probably related to: 2) Systems where people are not updating the BIOS are typically stuck at the gold version -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
