I am trying to troubleshoot an issue on a Lenovo Flex 14 with Ubuntu 14.04.1 (standard Unity flavour) with touchscreen.

Mostly it works perfectly well; but from time to time I reboot (mostly unintentionally due to the placement of the power button, but sometimes because of auto update [updating the kernel??]), and when it does, on some reboots the touchscreen does not work (does not respond to touch).

I have tried during these occurrences, doing as full a dump as I could of

  • cpuinfo
  • lsmod
  • lspci
  • lsusb

to text files.

When I reboot, the touchscreen is fine again. Both times when I let the laptop boot, I do not change any settings or add any options. I just let it boot on its own.

So I dump the same information again.

As far as I can see, nothing is different except for the processor speed - which during non-functioning touch-screen consistently displays a slower CPU speed in cpuinfo (c. 750 MHz instead of c. 1000 MHz - not in front of me right now, but thereabouts).

Other than that, I see no discrepancies between the two dumps (used sort and diff to confirm this)

Does anyone have any tips I can try to see where I could glean any info (other /proc/* dumps or commands to troubleshoot)? Does the change in clock speed mean anything to anyone? (and where should I dump logs to if required?)



EDIT: Yes, I know rebooting "solves" the issue in the immediate - but I'm more interested in troubleshooting tips than anyone actually having an answer.


Don't reboot directly but first shutdown then start it. This is probably some driver problem. Hope it helps!

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