On 01.10.2016 11:34, Pierre de Villemereuil wrote:
Hi Mathias,
FYI, turned out to be pretty easy. I got the tip from deano_ferrari without
even asking:
https://forums.opensuse.org/showthread.php/519926-No-USB-device-detected?
p=2794434#post2794434
Simply adding this to GRUB options while launching kernel:
usbcore.autosuspend=-1
disables USB suspends and fixes the problem (well, "workarounds" it).
Weirdly enough, I still get "auto" on battery with:
cat /sys/bus/pci/devices/0000\:00\:14.0/power/control
Though I get "-1" from this:
cat /sys/module/usbcore/parameters/autosuspend
Not sure any of this is relevant, but I guess sharing information can't hurt.
It's probably laptop-mode-tools (or equivalent) that keeps writing over that
value.
I'm writing a workaround that will disable runtime PM for the xhci controller
In case we are about to put (keep) it in D0 without PME# wake support.
I also learned the lspci -vv might wake up the controller from D3cold so it's
also
possible that PME# is failing in D3Cold.
Could you do two more things to verify the D state so that I fix the right
issue:
1. check the D state from sysfs, on-battery, in state where usb devices are not
detected:
cat /sys/bus/pci/devices/0000\:00\:14.0/firmware_node/power_state
2. send the DSDT table of your machine, it includes the ACPI methods that
dictate the possible D states
copy /sys/firmware/acpi/tables/DSDT to a file and send it (a link to it, or
attachment) to me, It's binary.
-Mathias
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