I really need help. I have Kubuntu 16.10 on my laptop a everything worked. With external hdmi monitor too. But once I unplugged the monitor, then plugged it in again. And now it doesn't work without the external monitor. After login I have only black screen. Any ideas?
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The brightness shortcuts via fn key don't work.  I tried each solution from . After editing /etc/default/grub file I rebooted.  GRUB_CMDLINE_LINUX="acpi_osi=Linux" GRUB_CMDLINE_LINUX="acpi_backlight=vendor" GRUB_CMDLINE_LINUX="acpi_osi=linux acpi_backlight=vendor" GRUB_CMDLINE_LINUX="acpi_osi_Linux"   What other workarounds/solutions are there?  Relevant output:  $ sudo lshw -C display   *-display UNCLAIMED             description: 3D controller        product: GK107M [GeForce GT 750M]        vendor: NVIDIA Corporation        physical id: 0        bus info: pci@0000:01:00.0        version: a1        width: 64 bits        clock: 33MHz        capabilities: pm msi pciexpress bus_master cap_list        configuration: latency=0        resources: memory:f6000000-f6ffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:e000(size=128) memory:f7000000-f707ffff   *-display        description: VGA compatible controller        product: 4th Gen Core Processor Integrated Graphics Controller        vendor: Intel Corporation        physical id: 2        bus info: pci@0000:00:02.0        version: 06        width: 64 bits        clock: 33MHz        capabilities: msi pm vga_controller bus_master cap_list rom        configuration: driver=i915 latency=0        resources: irq:50 memory:f7400000-f77fffff memory:d0000000-dfffffff ioport:f000(size=64)
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I get      every few minutes on Kubuntu (KDE), and the panels disappear.  It restarts itself automatically, so it's not a real problem, just an annoyance, but it is a big annoyance.  I've tried sudo apt install --reinstall plasmashell plasma-desktop, but that made no difference.  When I try a backtrace from the error message, it says it's unable to produce a useful backtrace.
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After upgrading from Kubuntu 20.04 to Kubuntu 20.10, I could not login as it just showed a black screen after boot. So I switched to command line and reinstalled Kubuntu desktop with sudo apt-get install --reinstall kubuntu-desktop kde-*. After that, i was able to login and can use all applications but the icons and background of input boxes of system apps have turned black as shown below  Notice the black squares at the bottom right in the system tray, they used to be icons for Volume, Network, Bluetooth, etc. I can however click them and they behave as they used to. Also the desktop apps' icons are black.  Notice the input fields at the right of Layout, Wallpaer type and also the button backgrounds of the window. After looking at some logs I noticed that Akonadi server was not starting up because of an unknown MySQL error and installed MariaDb as i read somewhere that it might help. Now I can start Akonadi server with akonadictl manually but still the same issue. I restarted plasma with kquitapp5 plasmashell &amp;&amp; kstart5 plasmashell but still same issue. Also Akonadi does not start automatically when session begins.
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I have a 2017 MacBook Pro. It has 2 USB-C ports on the left side and I use an Aukey hub to provide more ports (4 USB, 1 HDMI, 1 USB-C) and always to connect two monitors.   I connect one monitor through the hub with the HDMI port and another directly to the MBP with a USB-C adapter. Sometimes when I connect the hub to the Mac and the 2nd monitor to the Mac, it works as it should with no problem...but more than half the time I have to connect, disconnect, jiggle, jangle, switch ports, reconnect HDMI, etc. and hopefully they will both work. OFTEN, I can only get one monitor to fire up.  Is there any kind of software fix or reset that might solve this issue? Any other thoughts welcome. Thanks.
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I have Blank screen disabled but my PC seems to be ignoring this. This issue also ignores the  extension. This is pretty recent behavior as it's been working for a long while now.    Disabling idle-dim in dconf seems to have done it.
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I need to enter the command line alone with no GUI to install the official NVIDIA drivers. I'm trying to get my computer to work over HDMI and someone on Youtube shows how but you have to be in the Nvidia settings program.
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I know this might be a duplicate, but I've read a lot of threads about this and none pointed me to the solution.  When loading GRUB2 I have a black screen (with static white cursor on the upper left) which goes away as soon as the Ubuntu login page comes up, but stays there forever if I boot Windows (even though I can hear the 'login sounds').  I have a dual boot system with Ubuntu 14.04 and Windows 7 (both 64-bit) and I have a NVIDIA VGA. The Windows installation used to work just fine, with the VGA doing its job. My monitor was plugged on the motherboard when I fresh installed 'trusty tahr' (I have a integrated intel graphics CPU) and after that I immediately installed the video card drivers from the official repo (nvidia-331 I believe). Their installation was successful (at least from what I see from the 'Nvidia X serve settings' tool). After that, if I plug the monitor on the video card, grub goes on the black screen, but I can anyway boot Ubuntu and when the login page comes up the video output is normal. The same cannot be told when Windows boot.  I tried many suggested fixes: nouveau.modeset=0, nvidia.modeset=0, nomodeset options in the /etc/default/grub file and I also tried blacklisting the corresponding kernel modules adding a .conf file in /etc/modprobe.d. None of that solved my problem.  I insist that this must be a grub video problem, since if I plug my monitor on the mother board I can boot successfully both Ubuntu and Windows and also the boot-repair tool for Ubuntu doesn't find anything significant (see ).  I'm currently out of ideas, has anyone any suggestion? It would be much appreciated!  Lorenzo
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I bought the wireless adapter to use with a computer without internet access but I can't figure out how to install it with just a USB with the driver on it. I've read a few articles on how to install the driver but they all require me to have internet access and I don't have internet. I'm completely new to Ubuntu. If you can help that would be great. Thanks!  Ps: I have the latest version of Ubuntu as of 7-5-16.
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I installed ubuntu 16.04 LTS a week after official release using the mini ISO, then ubuntu-desktop without recommended packages. Since then, just installing packages on a need to basis.   After trying to wake the computer from sleep by using the touchpad, the light on the power button stops blinking and I hear the sound of the hard drive coming online. But :    the screen stays completely off, no backlight. the laptop doesn't respond to any keyboard presses. Everytime I use The magic SysRq to restart the laptop. Long pressing the power button works too.   This problem wasn't present when using ubuntu 14.04 LTS  The proposed solutions in all the possible duplicates on this website didn't solve my problem. One big difference is that my laptop screen is off not just blank.  Possible helpful informations. All got after system reboot.       HARDWARE DETAILS :   Computer Model :   Hewlett-Packard Compaq Presario C700 Notebook PC/30D9, BIOS F.35 03/29/2010     uname -a   Linux CPC700 4.4.0-22-generic #39-Ubuntu SMP Thu May 5 16:53:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux      lspci -nn :    00:00.0 Host bridge [0600]: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub [8086:2a00] (rev 03) 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) [8086:2a02] (rev 03) 00:02.1 Display controller [0380]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (secondary) [8086:2a03] (rev 03)      sudo lshw -class display   *-display:0    description: VGA compatible controller    product: Mobile GM965/GL960 Integrated Graphics Controller (primary)    vendor: Intel Corporation    physical id: 2    bus info: pci@0000:00:02.0    version: 03    width: 64 bits    clock: 33MHz    capabilities: msi pm vga_controller bus_master cap_list rom    configuration: driver=i915 latency=0    resources: irq:26 memory:91000000-910fffff memory:80000000-8fffffff ioport:30d0(size=8) *-display:1 UNCLAIMED    description: Display controller    product: Mobile GM965/GL960 Integrated Graphics Controller (secondary)    vendor: Intel Corporation    physical id: 2.1    bus info: pci@0000:00:02.1    version: 03    width: 64 bits    clock: 33MHz    capabilities: pm bus_master cap_list    configuration: latency=0    resources: memory:91100000-911fffff   EDIT 1 I think this is a bug, because it doesn't happen all the time anymore. I would file it as such on launchpad but I don't know which packages cause the problem. How can I go on to find them in my specific case ?  EDIT 2 With the setting "When the lid is closed : do nothing".     The system doesn't go to sleep when I close the lid. Content of listens (acpi_listen > ~/listens) :       button/lid LID close   button/lid LID open
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I have a HP dv9830us laptop. It has a vga-out and a hdmi-out port.  I want to know if it's possible to use 3 devices, each one with different displays, using just one graphic card - NVIDIA GeForce 8600M GS? (Original, vga with an external monitor and hdmi with a full hd tv). Where I can find this kind of information?  If not possible, I would like to know alternatives like:   "Usb" solutions to be possible to connect to the external lcd or to a TV. The TV should be flawless, but the second monitor can have slow response times; (I've found some , do these units really work?) Cheap PCMCIA video cards to be possible to connect to an external monitor, so I would use the hdmi with the tv and this second video card to output to another monitor.   I'm using Windows 7 and Ubuntu 10.04. Is this possible in both systems?
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I accidentally pressed Ctrl+Alt+F12 and my display turned to black... I then had to make a reboot.. What did it do to my system? Also what does Alt+ F8 to F10 do?
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I got two laptops which share keyboard, mouse and monitor using a kvm-switch. One laptop runs Windows XP and works perfectly. The other one running Windows 7, however does not recognize keyboard and mouse.  I made the hidden devices visible and deleted the unused ones. After the reboot the keyboard and the mouse work. Windows 7 tries to find the 'missing' drivers and upon failing deactivates the devices which renders them unusable again.  Has anybody had the same problem and can help me with it?  Cheers, AC  Edit:  The KVM-Switch is an ATEN Petite CS692 2-Port USB HDMI KVM Switch  The keyboard a standard 102-key Logitech USB  The mouse a Logitech M705 Marathon Mouse with an unify[sic?] connector.  No adapters for the keyboard or mouse but one for dvi to hdmi on the Windows XP machine.
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I'm looking to download and install the latest version of Ubuntu to replace the current version of Windows I had pre-installed on my machine when bought it.   I have some really neat features on the machine that I really am hoping will still work when I move over to Ubuntu.  Can someone please confirm if the below will still work and, if not, how I can get them to work:   The USB ports on my machine The ethernet or Network work port on the machine The HDMI output on the machine and finally, the built in webcam   Thanks Sam
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I am asking for a help or a fix for this black screen in Ubuntu 15.04.  The black screen contains the message starting version 219 and I am stuck in there for like a day already. Been trying to find a fix in Google but failed. So far I tried fixing it by going into the terminal using commands like:  sudo systemctl enable sddm.service -f   This command dint go through, because I don't have sddm in my system, so it failed. Next thing is, I found out, that my sddm was a lightdm, so I tried using  sudo systemctl enable lightdm.service -f    …and same result, but this time, it got a message, that it is not meant to be activated through systemctl. Lastly I tried this one:  systemctl start lightdm   This goes in. After putting my password, it went through, but it went back to the black screen. Tried hitting the shift key, when I rebooted it, but it didn't work.
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I have an Ubuntu 14.04 server that has no external monitor connected.  I use NoMachine to remote control the machine.  When I do so, the Unity/Gnome interface doesn't see any monitors connected, so I can only use 800x600 when connecting with NoMachine.  If I plug in a monitor, I can set the resolution to whatever size the NoMachine window is on the remote computer.  Is there a way to create a "fake" monitor device on Ubuntu so I can set a desktop resolution in Unity/Gnome?
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I'm sure I'm not the only one in this situation: I run Ubuntu 16 on my laptop, and I use that to connect to my workstation in the office.   Now there are a couple things that I have to do every day when I connect to my workstation, such as fixing my bluetooth mouse speed, setting the right resolution for both screens and restoring my wallpaper with nitrogen. For each of these tasks I have a (startup) script which works fine, but when I connect my second screen, the laptop is already booted.  So my question is, next to start-up applications, how could I (i.e.) run nitrogen --restore and scale down the resolution on my laptop (from 2560x1600 to 1440x900) when I connect the second screen?  What I do now is run all seperate scripts again manually, which isn't a big deal, but we don't use Ubuntu to just accept how it is, right? ;)  To clarify; my question isn't too specific for these tasks, but more in a general sense; how could I fire anything from the terminal on specific actions like "input of display detected"?
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I just moved from Windows to Ubuntu, but I cannot get the keyboard backlight to work at all. On Windows there was a specific program for controlling the backlight. I have searched for days now without luck. Anyone got a solution?  I am using Ubuntu 18.04