Re: Serious problem with SATA LPM in F28 on Lenovo 50 series laptops

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HI,

On 20-05-18 01:53, Andrew Lutomirski wrote:


On May 2, 2018, at 9:14 AM, Frantisek Zatloukal <fzatlouk@xxxxxxxxxx <mailto:fzatlouk@xxxxxxxxxx>> wrote:

Hans,
can't this be affected also by different disk vendors (drive vendor in Lenovo laptop can vary even in same model) and different firmware of disks? Also, drive FW is upgradeable in Lenovo laptops.

On Wed, May 2, 2018 at 5:39 PM, Hans de Goede <hdegoede@xxxxxxxxxx <mailto:hdegoede@xxxxxxxxxx>> wrote:

    Hi,


    On 05/01/2018 10:40 AM, Lorenzo Dalrio wrote:

        Hi,
        i run fedora 28 on a t450 since it was promoted to beta working with it
        8-10 hours per day without any issue.

        System Information
                  Manufacturer: LENOVO
                  Product Name: 20BUS003IX
                  Version: ThinkPad T450

        # cat /sys/class/scsi_host/host*/link_power_management_policy
        med_power_with_dipm
        med_power_with_dipm
        med_power_with_dipm

        === START OF INFORMATION SECTION ===
        Model Family:     SanDisk based SSDs
        Device Model:     SanDisk SD7UB3Q256G1001
        Serial Number:    153446402316
        LU WWN Device Id: 5 001b44 ec5b3450c
        Firmware Version: X2240501
        User Capacity:    256,060,514,304 bytes [256 GB]
        Sector Size:      512 bytes logical/physical
        Rotation Rate:    Solid State Device
        Form Factor:      2.5 inches
        Device is:        In smartctl database [for details use: -P show]
        ATA Version is:   ACS-2 T13/2015-D revision 3
        SATA Version is:  SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s)
        Local Time is:    Tue May  1 08:39:01 2018 UTC
        SMART support is: Available - device has SMART capability.
        SMART support is: Enabled


    Ok, so it seems that not everyone is affected, thank you for the
    info.

    Can you do:

    cat /sys/class/dmi/id/bios_version /sys/class/dmi/id/bios_date

    And let me know the output. Also related to this have you
    updated your BIOS recently / are you in the habbit
    of tracking BIOS updates? I'm wondering if this is BIOS
    version related.

I’m going to go out on a limb and suggest that the problem might be with power management, not with SATA per se. On a modern Intel system, an NVMe device that hasn’t internally gone to sleep will prevent the PCIe link from going into an ASPM sleep state, and that, in turn, will keep the whole system from going into a deep PCn state.  I could easily believe that there’s a bug where nasty ACPI things like brightness hotkeys go terribly wrong in deep PC states.  I would also believe that the lack of SATA LPM will also block deep PC states.  And I’d believe that the laptop has an electrical problem that only affects Linux for mysterious reasons.

Yes in the mean time there is only one unsolved case of the 50 series
having issues with LPM on a SSD which is known to work with LPM for
others. This is likely a power-management issue.

It turns out that the user who was having issues with brightness
changes replaced his LCD panel with a non Lenovo part to get an
IPS screen in his laptop, so that one I've scratched of the list
as being due to the non OEM panel.

Regards,

Hans
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