keyboard drops keystrokes occasionally

[Michael Swierczek]

The problem is most obvious after you stop typing for a few minutes. I have 15.10 alpha. The problem does not appear on 15.04 or 14.04 LTS, only under 15.10. This is running on the raw hardware, not in a virtual machine.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-3.19.0-22-generic 3.19.0-22.22
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic x86_64
ApportVersion: 2.17.3-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: mswierczek 2166 F.... pulseaudio
 /dev/snd/controlC0: mswierczek 2166 F.... pulseaudio
 /dev/snd/controlC1: mswierczek 2166 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Jun 29 08:09:48 2015
HibernationDevice: RESUME=UUID=5b0b26fc-1d23-41bf-831c-99cb636f8dec
InstallationDate: Installed on 2015-03-04 (117 days ago)
InstallationMedia: Lubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150224)
MachineType: System manufacturer System Product Name
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.19.0-22-generic root=UUID=9019ee84-0634-42cc-bac0-582273b24603 ro rootflags=subvol=@ quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-22-generic N/A
 linux-backports-modules-3.19.0-22-generic N/A
 linux-firmware 1.144
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/18/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2103
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A785TD-V 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.:bvr2103:bd06/18/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A785TD-VEVO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.1 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1-unstable/

[Michael Swierczek (mike-swierczek)]

That fixed it, thank you!

[Michael Swierczek (mike-swierczek)]

Running Ubuntu mainline kernel 4.1.0-040100 fixed it. Admins please feel free to close the ticket, and thank you to Joseph Salisbury for the help.

[penalvch (penalvch)]

Michael Swierczek, just to advise, the mainline kernel is not supported as per https://wiki.ubuntu.com/Kernel/MainlineBuilds .

Hence, the next step is to fully reverse commit bisect from kernel 3.19 to 4.1 in order to identify the last bad commit, followed immediately by the first good one. Once this commit has been identified, then it may be reviewed as a candidate for backporting into your release. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ?

Please note, finding adjacent kernel versions is not fully commit bisecting.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Michael Swierczek (mike-swierczek)]

I started the reverse bisect, but the default 3.19.0-22.22 kernel worked without errors. I am baffled as to what happened and why I was seeing the error 10 days ago and am not seeing it now. I have not changed my hardware in any way, and my USB keyboard uses a physical connection and not bluetooth.

I apologize, Joseph Salisbury and Christopher M. Penalver, for taking up some of your time. Thank you for your help.

[penalvch (penalvch)]

Michael Swierczek, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1469707/comments/7 regarding this is no longer an issue for you. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.