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[Daniel Frey <515194@xxxxxxxxxxxxxxxxxx>]

I didn’t know for sure if I should respond to this but it’s the only
search result I could find.

I had this problem on a new build. The LCD would shut off and a few
seconds later the backlight would come back on with no display.

For those that wind up here, it has nothing to do with the way Ubuntu
configures it’s drivers. I spent a couple hours on this and using a
multimeter discovered after the system halts the USB bus was being
reset. As in, the power dropped to 0V for a second then back up to 5V.
This resets the iMon display and causes the backlight to turn on with no
display.

In the PC BIOS, I had enabled all wake options (from memory, Pcie, USB,
lan, keyboard, mouse.)

It turns out enabling the machine to wake from a USB device causes the
motherboard to reset all USB devices when the system halts so the
attached USB devices can wake the system. On my motherboard, I only had
to set the BIOS to wake from keyboard with any key and the iMon device
will wake the system - all other options were disabled. After that, the
iMon display shut off and stayed off when the system halted.

Hope this helps others.

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https://bugs.launchpad.net/bugs/515194

Title:
  lcdproc does not shutdown imon(0038) lcd-display after system shutdown

Status in Mythbuntu:
  Won't Fix

Bug description:
  When I shut down Mythbuntu, LCD-display lights turn off for couple of
  seconds but then backlights turn on again and stay on after shutdown.
  Why this is happening? I have following parameters in LCDd.conf:

  [imonlcd]
  # Specify which iMon protocol should be used [legal: 0=15c2:ffdc device,
  # 1=15c2:0038 device; default: 0]
  Protocol=1

  # Set the exit behavior [legal: 0=leave shutdown message, 1=show the big clock,
  # 2=blank device; default: 1]
  OnExit=2

  lcdproc version information:

  sami@sami-htpc:~$ apt-cache policy lcdproc
  lcdproc:
    Asennettu: 0.5.3-0ubuntu1
    Ehdokas: 0.5.3-0ubuntu1
    Versiotaulukko:
   *** 0.5.3-0ubuntu1 0
          500 http://fi.archive.ubuntu.com karmic/universe Packages
          100 /var/lib/dpkg/status

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