I am trying to enable S3 wakeup from USB keyboard in Linux. After boot, if i execute in terminal command <cat /proc/acpi/wakeup> i get:
Device S-state Status Sysfs node PCI0 S5 disabled no-bus:pci0000:00 HDEF S4 disabled pci:0000:00:1b.0 RP01 S5 disabled pci:0000:00:1c.0 RP02 S5 disabled pci:0000:00:1c.1 RP03 S5 disabled pci:0000:00:1c.2 RP04 S5 disabled pci:0000:00:1c.3 RP05 S5 disabled pci:0000:00:1c.4 RP06 S5 disabled pci:0000:00:1c.5 USB1 S3 disabled pci:0000:00:1d.0 USB2 S3 disabled pci:0000:00:1d.1 USB3 S3 disabled pci:0000:00:1d.2 USB4 S3 disabled pci:0000:00:1d.3 EHC1 S3 disabled pci:0000:00:1d.7 MODM S4 disabled COMA S3 disabled pnp:00:08 COMB S3 disabled pnp:00:09
At my guess, current devices are devices from DSDT table with _PRW method. But for some reason (why?) wakeup for them disabled by default. I can enable wakeup for keyboard (in my case it is USB1) with:
echo PCI0 > /proc/acpi/wakeup
echo USB1 > /proc/acpi/wakeup
Throught some experiments i figured out, that these commands says to OS, that it should enable appropriate bits in ACPI GPE0_EN register before going to S3 (what bits exactly is defined in PCI0._PRW and USB1._PRW)
But this is not the end. I think OS power off USB controller when it goes to S3. To fix this i found device USB number from dmesg:
[ 2.724374] input: LITEON Technology USB Multimedia Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/input/input6
And executed command <echo enabled > /sys/bus/usb/devices/2-2/power/wakeup>
And only now wakeup from USB fully works.
My question is, how i should change DSDT/BIOS, to avoid all of these commands? I think main problem is a lack of something in DSDT.
Some fragments from current DSDT:
...
Device (USB1) { Name(_ADR, 0x001D0000) Name(_PRW, Package(0x02){ 0x03, 0x03 }) Method(_S3D,0) { Return(2) } }
...
Scope (_GPE) { .. // USB1 Method (_L03, 0) { Notify (_SB.PCI0.USB1, 0x02) } .. }