I am facing some weird issues since a few days, all of which seem to be arising due to a single problem.

Once the boot menu pops up, the selection immediately jumps to the last entry (which in my case is 'Reboot into Firmware interface'). I need to go up and select a kernel explicitly, whatever be the default setting. During the boot, I see some ^[[6~ characters on the screen. Similarly, when I open some apps (say Geary), sometimes the list of messages automatically gets scrolled down to the last entry and tries to jump ahead of the last entry (beeping). If I press a button (any button), the movement stops. So basically I guess the system is registering down key-presses (or probably touchpad scroll) automatically during boot and in sometimes in some apps. During boot it is always reproducible, but not in the apps. Does the control character ^[[6~ point towards anything?

Any suggestions on diagnosing/resolving the problem?

p.s. I am using Solus Budgie (clr-boot-manager) on a Lenovo Z50-70 laptop.

  • It looks like a hardware failure. – Ipor Sircer Nov 21 '17 at 16:47
  • Oh. Is there a way I could figure out whether it's due to the touchpad or the keyboard? Even if I disable the touchpad from the OS, it will still be recognizable during boot right? – Manas Nov 21 '17 at 16:50
  • Grub doesn't use any pointing device at all. – Ipor Sircer Nov 21 '17 at 16:52
  • Do you know what does the character-sequence ^[[6~ correspond to? – Manas Nov 21 '17 at 16:52
  • Just in case this is useful. I don't have grub. Solus uses clr-boot-manager on UEFI. – Manas Nov 21 '17 at 16:53

If it's due to some faulty key getting pressed automatically, you can detect it as follows

  1. Install xev, can be installed using package manager in all major Linux distributions.
  2. Open a terminal (not as sudo) and type xev
  3. xev shows every key press and mouse events. Keep the system undisturbed and wait for sometime, and troubleshoot the faulty key

Also it may be a kernel issue or Display issue. To figure out please try booting using a Ubuntu live disk and observe the issue is present or not. If the issue is resolved then it's probably some kernel and driver issue, otherwise it may be a display issue.

  • Thanks for the help. I have found that this was a faulty-key problem (PgDn). – Manas Nov 22 '17 at 5:35

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