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    system becomes extremely unstable when connecting PC to TV

    hello there,

    I often need to connect my PC (please see details below) to a Smart TV. I used to do it no problem with Ubuntu 16.04.

    On Kubuntu 16.04, I follow the same procedure: Settings>Display>choose HMDI upon connecting the cable. I'm using the same USB cable I previously used with Ubuntu.

    Before disconnecting the cable, I switch to "laptop" at Settings>Display. The moment I disconnect the cable, Plasma (if I'm using the right name for the desktop environment) goes bananas: icons disappear, the panel disappears, and so on. Re-booting the machine via Ctrl-Al-F1 doesn't help (ie, the panel is not where it should be, the desktop theme looks different, etc). Btw, I noticed that the desktop environment becomes somewhat unstable when I have loads of windows open + I'm doing two million things at once, but usually it's enough to re-boot the machine and things go back to normal.

    do you have any idea? I googled the issue and found out that some people have the same problem though I haven't come across a solution.

    thanks in advance.

    ------
    info about my system (if you need more info, please let me know:

    - DISTRIB_RELEASE=16.04;
    - sorry "Alt+F2 then type dolphin then click on Help > About KDE" doesn't give any useful info about KDE...(that I can see..);
    - ~$ apt-cache show grub | grep ersion
    Version: 0.97-29ubuntu68
    Description-en_GB: GRand Unified Bootloader (Legacy version);

    -
    Asus ZenBook UX301LA
    -
    ~$ lscpu
    Architecture: x86_64
    CPU op-mode(s): 32-bit, 64-bit
    Byte Order: Little Endian
    CPU(s): 4
    On-line CPU(s) list: 0-3
    Thread(s) per core: 2
    Core(s) per socket: 2
    Socket(s): 1
    NUMA node(s): 1
    Vendor ID: GenuineIntel
    CPU family: 6
    Model: 69
    Model name: Intel(R) Core(TM) i5-4200U CPU @ 1.60G
    Stepping: 1
    CPU MHz: 1098.429
    CPU max MHz: 2600.0000
    CPU min MHz: 800.0000
    BogoMIPS: 4588.98
    Virtualisation: VT-x
    L1d cache: 32K
    L1i cache: 32K
    L2 cache: 256K
    L3 cache: 3072K
    NUMA node0 CPU(s): 0-3
    Flags: fpu vme de pse tsc msr pae mce cx8 api
    pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscal
    tant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonsto
    ni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma
    sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rd
    adow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2
    veopt dtherm ida arat pln pts


    ~$ lspci | grep aphic
    00:02.0 VGA compatible controller: Intel Corporation Haswell-
    troller (rev 09)

    #2
    My laptop (14.04) didn't go crazy when plugged into an HDMI monitor but it didn't register. I had to plug it in when the latop and monitor were both turned off. I haven't tried hot plugging it on my new monitor.
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