I forgot to mention this, but the way OpenHMD switches modes is by using the hidapi library, which has two versions for libusb and hidraw. You just link against the one you want. So the code is doing the exact same thing in each case, and the HID version of it doesn't work. That's why I think it is a HID bug.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1337641 Title: Oculus Rift "drifts" on recent kernels Status in “linux” package in Ubuntu: Confirmed Bug description: When running Oculus Rift compatible software, the HMD rotation seen by software drifts by a few degrees per second, even when the HMD is not moving at all (ie, it's sitting perfectly still on the desk). This is a regression in 3.13.0-27 and newer. Downgrading to 3.13.0-24 prevents the bug from happening. The bug happens after using the OR in hidraw mode (which is what the OVR SDK uses), and will even persist if you reboot into Windows without power cycling the device. OpenHMD is an alternative SDK for the Oculus Rift. When using OpenHMD in libusb mode the problem does not happen, unless you have previously used some software which opens the OR in hidraw mode. OpenHMD can also be compiled to use hidraw, and if you do that it just shows a black screen with the example. If you then run it in libusb mode, the drift happens. This bug has been reported on the Oculus forums: https://developer.oculusvr.com/forums/viewtopic.php?f=34&t=9689 To me this looks like a HID bug. Something is messing up the state of the hardware so badly that it will continue to report bad data even when using software that works correctly after a power cycle. Looking at the commits between -24 and -27 kernels I see a bunch of commits to HID which look like they might be responsible for this. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-30-generic 3.13.0-30.54 ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2 Uname: Linux 3.13.0-30-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: al 1999 F.... pulseaudio /dev/snd/controlC1: al 1999 F.... pulseaudio /dev/snd/controlC0: al 1999 F.... pulseaudio CurrentDesktop: XFCE Date: Fri Jul 4 01:07:13 2014 HibernationDevice: RESUME=UUID=cd4b4f29-2984-430a-8556-26b5fd58d903 InstallationDate: Installed on 2014-06-29 (4 days ago) InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: System manufacturer System Product Name ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=UUID=06500b4e-b446-411c-9a19-cfff649a7be4 ro quiet splash RelatedPackageVersions: linux-restricted-modules-3.13.0-30-generic N/A linux-backports-modules-3.13.0-30-generic N/A linux-firmware 1.127.4 RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/25/2009 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0704 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: M4A79XTD EVO dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev X.0X dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0704:bd11/25/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A79XTDEVO:rvrRevX.0X:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1337641/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
