Public bug reported: I am on a Sony VAIO svf43142sn. My laptop has the ability to leave a USB port powered on even after shutdown to charge other devices. The value of /sys/devices/platform/sony-laptop/usb_charge is 1, but the USB port is not powered on. Also when I tried toggling it to 0 it resets back to 1 when I check again using cat.
So I restarted the module sony-laptop with debug flags on. When I try echo -n 0 | sudo tee -a /sys/devices/platform/sony-laptop/usb_charge these are the curresponding kernel logs, implying that it was a success: [ 9121.879908] sony_laptop: found handle 0x0155 (offset: 0x07) [ 9121.881386] sony_laptop: __call_snc_method: [SN07:0x0000000000000107] [ 9121.881394] sony_laptop: called SN07 with 0x0107 (result: 0x0000) But if I cat the value of usb charge, the change is not reflected, and I see this when I dmesg: [ 9346.202318] sony_laptop: found handle 0x0155 (offset: 0x07) [ 9346.202489] sony_laptop: __call_snc_method: [SN07:0x0000000000000007] [ 9346.202494] sony_laptop: called SN07 with 0x0007 (result: 0x0001) If it matters, when i simply echo 1, I will get this: [ 9879.675844] sony_laptop: found handle 0x0155 (offset: 0x07) [ 9879.676878] sony_laptop: __call_snc_method: [SN07:0x0000000000010107] [ 9879.676885] sony_laptop: called SN07 with 0x10107 (result: 0x0000) The entire debug message when I restart the module(sony-laptop) is given here: http://paste.ubuntu.com/11551226/ I have asked the same as a question on askubuntu.com. It has got a other information if you need it: http://askubuntu.com/questions/628542/how-to-leave-a-usb-port-powered-during-shutdown-for-charging-mobile ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.16.0-38-generic 3.16.0-38.52~14.04.1 ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10 Uname: Linux 3.16.0-38-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.14.1-0ubuntu3.11 Architecture: amd64 CurrentDesktop: Unity Date: Thu Jun 4 19:43:21 2015 InstallationDate: Installed on 2015-05-28 (6 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) SourcePackage: linux-lts-utopic UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-lts-utopic (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug trusty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1461986 Title: can't change usb_charge attribute in /sys/devices/platform/sony-laptop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1461986/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
