Doug, you added the tag 'kernel-fixed-upstream' but I don't think we have hard evidence of that at this point. Was your tagging based only on Viktor's reports that it hasn't happened (yet) on a 4.6 kernel, or is there more information elsewhere?
Viktor, your result with 4.6 is promising! However, since this problem is known to "come and go" it is also possible that code has just moved around such that its just not manifesting in your current 4.6 kernel build you currently (but could reappear in some future build of 4.6). I do see one potentially interesting fix in 4.6 (50220de HID: core: prevent out-of-bound reading). I'm going to produce a test kernel with just that fix backported on top of Xenial 4.4.0-22.40 (which I've seen manifest the problem), and will post that here for further testing. ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Kamal Mostafa (kamalmostafa) ** Changed in: linux (Ubuntu) Importance: Medium => High ** Also affects: linux (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Xenial) Status: New => Confirmed ** Changed in: linux (Ubuntu Xenial) Importance: Undecided => High ** Changed in: linux (Ubuntu Xenial) Assignee: (unassigned) => Kamal Mostafa (kamalmostafa) ** Also affects: linux (Ubuntu Wily) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Wily) Status: New => Confirmed -- 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/1579190 Title: Key 5 automatically pressed on some Logitech wireless keyboards Status in linux package in Ubuntu: Confirmed Status in linux source package in Wily: Confirmed Status in linux source package in Xenial: Confirmed Bug description: I have a K520 Logitech keyboard and sometimes something starts to keep pressing key 5. It mostly happens when I leave the computer alone for some time, but sometimes also just during regular usage. It seems that this is a Linux specific issue as no one is complaining about this issue under Windows, but a couple of people are complaining for different versions of Ubuntu. It is always 5 and WladyXX3740 claims on the Logitech forum that: "happens on Ubuntu 15.10 and 16.04, does not happen on Ubuntu 15.04, probably kernel related." Here is where most of the people are complaining: https://forums.logitech.com/t5/Keyboards-and-Keyboard-Mice/Ubuntu-15-10-and-K520-key-5-automatically-pressed-resulting-in/td-p/1488639 I discovered that this is related to my Logitech keyboard by running this command: xinput test-xi2 --root Here is the device list: ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ Logitech K520 id=10 [slave pointer (2)] ⎜ ↳ Logitech M310/M310t id=11 [slave pointer (2)] ⎜ ↳ AlpsPS/2 ALPS DualPoint Stick id=15 [slave pointer (2)] ⎜ ↳ AlpsPS/2 ALPS DualPoint TouchPad id=14 [slave pointer (2)] ⎣ Virtual core keyboard id=3 [master keyboard (2)] ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)] ↳ Integrated_Webcam_HD id=12 [slave keyboard (3)] ↳ Sleep Button id=9 [slave keyboard (3)] ↳ Video Bus id=7 [slave keyboard (3)] ↳ Power Button id=6 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)] ↳ Power Button id=8 [slave keyboard (3)] ↳ DELL Wireless hotkeys id=16 [slave keyboard (3)] ↳ Dell WMI hotkeys id=17 [slave keyboard (3)] And some extract from the output when this happens: EVENT type 2 (KeyPress) device: 10 (10) detail: 14 flags: root: 449.00/427.00 event: 449.00/427.00 buttons: modifiers: locked 0x10 latched 0 base 0 effective: 0x10 group: locked 0 latched 0 base 0 effective: 0 valuators: windows: root 0xf6 event 0xf6 child 0x36000f8 EVENT type 12 (PropertyEvent) property: 308 'Synaptics Off' changed: modified EVENT type 2 (KeyPress) device: 10 (10) detail: 14 flags: repeat root: 449.00/427.00 event: 449.00/427.00 buttons: modifiers: locked 0x10 latched 0 base 0 effective: 0x10 group: locked 0 latched 0 base 0 effective: 0 valuators: windows: root 0xf6 event 0xf6 child 0x36000f8 EVENT type 2 (KeyPress) device: 10 (10) detail: 14 flags: repeat root: 449.00/427.00 event: 449.00/427.00 buttons: modifiers: locked 0x10 latched 0 base 0 effective: 0x10 group: locked 0 latched 0 base 0 effective: 0 valuators: windows: root 0xf6 event 0xf6 child 0x36000f8 EVENT type 2 (KeyPress) device: 10 (10) detail: 14 flags: repeat root: 449.00/427.00 event: 449.00/427.00 buttons: modifiers: locked 0x10 latched 0 base 0 effective: 0x10 group: locked 0 latched 0 base 0 effective: 0 valuators: windows: root 0xf6 event 0xf6 child 0x36000f8 EVENT type 2 (KeyPress) device: 10 (10) detail: 14 flags: repeat root: 449.00/427.00 event: 449.00/427.00 buttons: modifiers: locked 0x10 latched 0 base 0 effective: 0x10 group: locked 0 latched 0 base 0 effective: 0 valuators: windows: root 0xf6 event 0xf6 child 0x36000f8 EVENT type 2 (KeyPress) device: 10 (10) detail: 14 flags: repeat root: 449.00/427.00 event: 449.00/427.00 buttons: modifiers: locked 0x10 latched 0 base 0 effective: 0x10 group: locked 0 latched 0 base 0 effective: 0 valuators: windows: root 0xf6 event 0xf6 child 0x36000f8 ... ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-generic 4.4.0.21.22 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: viktor 2133 F.... pulseaudio /dev/snd/controlC0: viktor 2133 F.... pulseaudio CurrentDesktop: GNOME Date: Fri May 6 20:45:07 2016 HibernationDevice: RESUME=UUID=67c8171e-474f-4bdb-a2c8-22aead3fb294 MachineType: Dell Inc. Latitude E5550 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=/dev/mapper/system_vg-root_lv ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-21-generic N/A linux-backports-modules-4.4.0-21-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/18/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A11 dmi.board.name: 0JPRM5 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA11:bd11/18/2015:svnDellInc.:pnLatitudeE5550:pvr:rvnDellInc.:rn0JPRM5:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5550 dmi.sys.vendor: Dell Inc. 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