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Up until a few weeks ago, when I entered Suspend mode (pressing power button, selecting it from the power button dropdown or automatic suspension), the power button on my tower would do a slow blink (about 1 per second).

Not sure what happened, but that no longer is the case. Does anyone know why? I have tried editing the grub file to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mem_sleep_default=deep" or GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mem_sleep_default=shallow" and it doesn't make a difference.

What would have changed this behaviour? I have not made other changes to this computer and there are not a lot of fine controls of power settings that I have been able to find.

Peter Eliopoulos
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  • Has the LED died? – guiverc Jul 26 '19 at 05:33
  • If you go back to an earlier kernel (during boot by selecting "Advanced Options" and then selecting from the list) does the LED functionality return? – tudor -Reinstate Monica- Jul 26 '19 at 08:18
  • LED is working fine, nice solid blue when powered up – Peter Eliopoulos Jul 26 '19 at 23:42
  • Having trouble getting to Advanced Options, not recognizing SHIFT or ESC key presses on boot. Will keep trying. – Peter Eliopoulos Jul 26 '19 at 23:43
  • Can't seem to get to Advanced options on startup, but I used Grub Customizer to book to one kernel version back (5.0.0-20) and I have the same issue still. Don't know if I can access other kernels further back - I wish I could force the Grub menu at startup so I could get to see more Advanced Options potentially. – Peter Eliopoulos Jul 27 '19 at 04:41
  • You aren't alone. Since 2010 there are 500 votes for question and answer on how to show grub menu on boot up: https://askubuntu.com/questions/16042/how-to-get-to-the-grub-menu-at-boot-time – WinEunuuchs2Unix Jul 27 '19 at 23:25
  • 5.0.0-19or even 5.0.0-18 would be the kernel version a few weeks back. I think 5.0.0-20 is probably a couple weeks old. – WinEunuuchs2Unix Jul 27 '19 at 23:30
  • thanks so much @WinEunuuchs2Unix - that link made me notice the option in Grub Customizer to set the "Boot default entry" time so that I could catch the menu!!

    Bad news, only 5.0.0-20 and 21 are available there. Now to research how to get back to older kernels...

     – Peter Eliopoulos Jul 27 '19 at 23:52
  • @PeterEliopoulos I just stick to a Long Time Kernel chain that works 4.14 LTS. I just install bug fixes for 4.14.134 a couple days ago: https://askubuntu.com/questions/119080/how-to-update-kernel-to-the-latest-mainline-version-without-any-distro-upgrade/885165#885165 – WinEunuuchs2Unix Jul 28 '19 at 00:04
  • 0k, I tried 5.0.0-19, 17 and 16 as well as the 4.14.134, no difference, no blinking in suspend mode (pushing the button or from the menu). Very odd. I'm going to try a liveUSB version of 18.04 next. – Peter Eliopoulos Jul 28 '19 at 01:57
  • It's now getting odd, 18.04 on a live USB has the same symptoms. I'm convinced this is now some sort of hardware issue on the motherboard. – Peter Eliopoulos Jul 28 '19 at 03:27

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