Page 2 of 2 FirstFirst 12
Results 11 to 17 of 17

Thread: Monitors do not power down when screen blanks

  1. #11
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Monitors do not power down when screen blanks

    GUI stuff isn't the OS on any Linux system. Any GUI is tacked on after. That means, trying different GUIs until you find one that behaves in the way expected isn't a big deal. The GUI is just another program to be installed, tested, and removed. Most definitely NOT the OS.

    Gnome3 has lots of issues. If this is a show stopper, perhaps trying KDE would make sense? Or Mate or XFCE or LXQt or Cinnamon or ... dropping a DE completely and going with a Window Manager-only setup? Lots of options.

    I'm actually a little confused that CentOS has a GUI. Servers shouldn't have any GUI.

  2. #12
    Join Date
    Sep 2006
    Location
    Cape Coral, FL USA
    Beans
    191
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Monitors do not power down when screen blanks

    It has been a month an a half and maybe your found your answer. If so what was the ultimate solution? I'm not sure why the other posters went off the rails about differences between OS' and didn't address you issue, but maybe this will help as I have the same issue:

    Monitors go blank, but do not power down

    Background: I received a donation of a small stack of identical Dell 5040's. I decided to replace three PC of various makes, all running dual monitors, all working before the swap. Each got a fresh install of the latest build of Ubuntu 20.04.2.0 Two of the builds work exactly as expected, but one exhibits the problem you are reporting.

    Since I have a small stack of identical units, I swaped out the box but kep the already build HD. The problem was still there. Next, I booted to the USB installation media and selected "Try Ubuntu" and let it sit for 10-15 mintues. It work liked you would expect it to. So I figured something must have gone wrong in the original installation. Give it a fresh installation and ... I still have the problem.

    So it's not that hardware, the monitors turn off properly if Ubuntu is ran from the installation USB, but will not turn off properly after a full installation. I also reran all updates. Later today I will receive new HDMI to Displayport cables and swap those out (for an unrelated reason) so maybe that will change something. But again, because the monitors turn off normally when booted from the installation media, this is not likely the cause. And of course it's not the PC because I changed it, and the other two are behaving normally. The only thing left is the monitors themselves. They are a pair of InnoView 24".

    Years ago I had a thread going about an odd problem with my Toshiba laptop. Similar to this issue, when the laptop was booted to the installation media, the keyboard and touchpad worked fine, but once the OS was installed, they would stop working until I entered some 'no splash' and mux=1 strings in my grub config file. I have no idea why that worked, but I have always had to do that when installing Ubuntu to that laptop. Perhaps there is some weird combination going on with the InnoView monitors and the Dell 5040. I will try the 'no splash' trick later today and let you know if it changed anything.
    A goat leads the lambs to slaughter......

  3. #13
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Monitors do not power down when screen blanks

    Do newer Ubuntu Desktop installs switch to a proprietary driver in the "Try Ubuntu" environment or are they using the F/LOSS GPU driver? That could be the difference for why some commands work and others do not.

    Proprietary GPU drivers have always caused more problems then they should for Linux. The best capability and stable GPUs are from Intel. Then AMD, and lastly nvidia. The first two provide driver code to Linux. nVidia provides objects which aren't always so good. I have systems with all three types of GPUs. By far, I have the least issues with Intel iGPUs and the most issues with nvidia. nvidia (430 GT and a 1030 GT) is just a pain, honestly. Really wish I would have gotten an AMD rather than the 1030.

  4. #14
    Join Date
    Sep 2006
    Location
    Cape Coral, FL USA
    Beans
    191
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Monitors do not power down when screen blanks

    So I did some more testing:

    Got new cables. Made no difference, but I didn't expect them to.

    Looked up my old post on the laptop. Entered this:

    sudo nano /etc/default/grub
    changed this line to look like this GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.nomux i8042.reset"
    sudo update-grub
    Reboot

    This had no effect, but I knew it was just a shot in the dark. I reversed my changes

    I tried booting to the installation USB agan and verified the screens turn off as expected.

    Pulled an identical unit from another station that has been working normally and connected it to these two InnoView monitors. This unit exhibits the same off behavior: Screens go blank except the cursor remains inexplicitly on the screen anf the monitors never power down.

    I could think of only one other thing to try. Many of these came with an add on video card: AMD RADEON R5 340X 2GB DDR3 PCI-EXPRESS GRAPHICS VIDEO CARD KG8WY 7122107700G. I pulled the card from the unit I have been working with and tried that. It made no difference.

    The bottom line: When I hook up a Dell 5040 to these two InnoView monitors and boot from the installation USB into "Try Ubuntu" mode, the monitors go blank and power off per normal operation, but for some inexplicable reason when the OS is loaded from the internal HD, the monitors go blank except for the pointer which is left on the screen, and they never power off

    I sure hope someone out there has a clue on this weird behavior.
    A goat leads the lambs to slaughter......

  5. #15
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Monitors do not power down when screen blanks

    Das Goat, if you would like help, please open your own thread. This thread is for robkampen.

  6. #16
    Join Date
    Sep 2006
    Location
    Cape Coral, FL USA
    Beans
    191
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Monitors do not power down when screen blanks

    One final note:

    I though maybe the BIOS might be causing this behavior, so I did an upgrade to the current version 1.17.1 Now, when the screen goes blank the monitors DO turn off ... but just for a second and come on again. I set the time to 1 minute so I could observe and the system just kept doing that.

    Finally, I have a model 7020 that I was going to decommission. I hooked it up to these monitors and gave it a try. This one does this second behavior, turning things off then immediately back on. So this whole issue seems to be this particular monitor model paired with a Dell Optiplex computer.

    I put the original HP computer back that I was going to decommission after giving it a good cleaning and the problem went away. So ... HP+InnoView=GOOD Dell+Innoview=BAD

    I hope this helps someone.
    A goat leads the lambs to slaughter......

  7. #17
    Join Date
    Sep 2021
    Beans
    2

    Re: Monitors do not power down when screen blanks

    Quote Originally Posted by robkampen View Post
    Hi, New to Ubuntu, been a CentOS user for the last 15 years. Just working on a new box - ASUS MINI PN50 with Ubuntu 21.04 fully updated. System CPU is an AMD Ryzen 7 4700u with radeon graphics x8
    I have two 27 inch screens, best monitor reddit, one via DV and other via HDMI
    Under settings power I have enabled "dim screen when inactive" and set blank screen to 5 minutes, auto suspend is off as I need the machine to be up 24x7 but want the monitors to turn off after 5 minutes.
    I have searched and read lots of junk but most talks about Xorg which I believe is not in use with 21.04.
    I have tried xset dpms and get
    server does not have extension for dpms option
    search on this phrase also doesn't help.
    I have libxcb-dpms0 is already the newest version (1.14-3ubuntu1)
    not sure where to head next.
    Finding quite a few subtle differences between my CentOS 7 experiences and Ubuntu. It seems to be aimed at Windows type users and assumes a little too much for my comfort.
    i.e. when a wifi link has no internet access it just takes it upon itself to look for other wifi links - not what I need when I'm configuring a new network device and want it to stay locked to the link I select.
    I have tried a number of solutions but NetworkManager (?) thinks it knows better.
    Was contemplating using Ubuntu for some servers but this kind of take-over-control is not acceptable.
    Anyway, first things first - need to get my monitors to go into power save mode after 5 minutes.
    Suggestions please.
    Rob
    Did you ever sort this out? I'm having similar problems
    Last edited by secretgarden4112; 6 Days Ago at 07:49 PM.

Page 2 of 2 FirstFirst 12

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •