I tried using the kernel version that came with the released version of 12.04 (on an original install base of 12.04.3), but that seemed to cause stability problems.
So instead, I installed the original version of 12.04, and that seemed to work without reporting any problems. I then installed 12.04.2 without applying any updates, and that also seemed to work. So using the 3.5.x releases (I forget which version 12.04.2 uses by default), I started bisecting to try and find out which version seemed to introduce the problem. I was able to find various releases where the bug didn't seem to exhibit itself after continued use: - 3.5.0-23 - 3.5.0-27 - 3.5.0-31 And various versions where it did: - 3.5.0-32 - 3.5.0-34 - 3.5.0-44 Tailing kern.log using the 3.5.0-32 kernel: Dec 21 23:47:00 wyvern kernel: [ 8.931123] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card1/input10 Dec 21 23:47:00 wyvern kernel: [ 8.931174] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card1/input11 Dec 21 23:47:00 wyvern kernel: [ 8.931211] input: HDA Intel PCH Line Out as /devices/pci0000:00/0000:00:1b.0/sound/card1/input12 Dec 21 23:47:17 wyvern kernel: [ 25.264221] audit_printk_skb: 39 callbacks suppressed Dec 21 23:47:17 wyvern kernel: [ 25.264224] type=1400 audit(1387669637.133:24): apparmor="DENIED" operation="open" parent=1 profile="/usr/lib/telepathy/mission-control-5" name="/usr/share/gvfs/remote-volume-monitors/" pid=2084 comm="mission-control" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0 Dec 21 23:49:21 wyvern kernel: [ 149.924471] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:49:21 wyvern kernel: [ 149.927574] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:49:21 wyvern kernel: [ 149.938434] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:49:21 wyvern kernel: [ 149.939441] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:49:21 wyvern kernel: [ 149.950001] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:49:53 wyvern kernel: [ 181.549147] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:49:53 wyvern kernel: [ 181.552185] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:49:53 wyvern kernel: [ 181.553205] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:49:53 wyvern kernel: [ 181.560211] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:49:53 wyvern kernel: [ 181.594732] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:49:53 wyvern kernel: [ 181.604921] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:51:01 wyvern kernel: [ 249.472364] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:51:01 wyvern kernel: [ 249.473373] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:51:01 wyvern kernel: [ 249.474353] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:51:01 wyvern kernel: [ 249.477379] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:51:42 wyvern kernel: [ 290.179193] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:51:42 wyvern kernel: [ 290.182195] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:51:42 wyvern kernel: [ 290.183196] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:51:42 wyvern kernel: [ 290.190199] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. Dec 21 23:51:42 wyvern kernel: [ 290.191148] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 lost sync at byte 1 Dec 21 23:51:42 wyvern kernel: [ 290.194195] psmouse serio1: DualPoint TouchPad at isa0060/serio1/input0 - driver resynced. ^C allanc@wyvern:~$ uname -a Linux wyvern 3.5.0-32-generic #53~precise1-Ubuntu SMP Wed May 29 20:33:37 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux I was about to say that 3.5.0-32 seemed to be the first version I could recreate the bug in, but in the time that I've been writing this comment, I've encountered the "lost sync" error using the 3.5.0-31 kernel (it's taken nearly an hour of uptime and continual use to stumble across it). I'll carry on bisecting it. It's anecdotal, but it did seem that kernels which were 3.5.0-32 or later were able to trigger the bug much quicker than the earlier kernel versions I was testing with. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1258837 Title: [Dell Latitude E7440] ALPS touchpad keeps having state reset To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258837/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
