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    #1

    amdgpu and HDMI monitor makes x.org not work

    I am trying to get my laptop using amdgpu to work using a second screen. However if I plug it in after logon and try to set up the monitor as anything other than a clone of the laptop display, it crashes and I end up at the SDDM login screen.
    From there if I try to login it immediately crashes and sends me back to the go in screen. Unpluging the HDMI cable makes the the laptop screen go black
    What I have tried to fix the problem:
    1. boot with a kernel from the regular ubuntu repo rather than one I installed via ukuu
    2. purge and roll back the amdgpu drivers from the ppaibaf/graphics-drivers ones to the ones that come with kubuntu
    3. thinking it might be an SDDM bug I updated plasma via the kubuntu backports ppa
    None of those worked.

    So I tried installing on another partition this time with the HDMI monitor plugged in. Live USB booted with no problems, install worked. Reboot and both screens worked well. I then tried one step at a time to break the system to replicate the problem.
    1. I updated the kernel to 4.16.3-041603-generic via Ukuu, reboot. It all works fine.
    2. I tried updating to the ppa amdgpu drivers, reboot. Again works fine
    3. I tried installing steam, rebooting and it still worked.
    4. I updated KDE via the backports PPA, rebooted and still no problems.

    Which has me thinking, just what is wrong with my main install of Kubuntu? How do I fix this?
    Code:
    uname -a                                                                                                                                                                                                                                                
Linux W4R-D3N 4.16.3-041603-generic #201804190730 SMP Thu Apr 19 07:32:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
    lspci output:
    Code:
    00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1450
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 1451
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1452
00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 1453
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1452
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1452
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 1453
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1452
00:07.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1452
00:07.1 PCI bridge: Advanced Micro Devices, Inc.

[AMD] Device 1454
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1452
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 1454
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 59)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1460
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1461
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1462
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1463
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1464
00:18.5 Host bridge: Advanced Micro Devices, Inc.

[AMD] Device 1465
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1466
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1467
03:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] USB 3.1 XHCI Controller (rev 02)
03:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] Device 43b7 (rev 02)
03:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b2 (rev 02)
04:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b4 (rev 02)
04:01.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b4 (rev 02)
04:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b4 (rev 02)
04:05.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b4 (rev 02)
04:06.0 PCI bridge: Advanced Micro Devices, Inc.

[AMD] Device 43b4 (rev 02)
04:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b4 (rev 02)
04:08.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b4 (rev 02)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
07:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device b822
0c:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480] (rev c1)
0c:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
11:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Device 145a
11:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 1456
11:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] USB3 Host Controller
12:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc.

[AMD] Device 1455                                                                                                                                                                                   
12:00.2 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 51)                                                                                                                                                                           
12:00.3 Audio device: Advanced Micro Devices, Inc. [AMD] Device 1457
    Xorg.0.log,old: https://pastebin.com/nkZ7KmMg
    Tags: amdgpu, asus rog, external monitor, kubuntu
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    #2
    Have you tried, with the laptop powered off, plugging in the HDMI monitor and then booting?
    Windows no longer obstructs my view.
    Using Kubuntu Linux since March 23, 2007.
    "It is a capital mistake to theorize before one has data." - Sherlock Holmes​
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      #3
      Yes, I have.
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        #4
        try deleting the " /home/you/.local/share/kscreen/" folder , reboot and try again .

        VINNY
        i7 4core HT 8MB L3 2.9GHz
        16GB RAM
        Nvidia GTX 860M 4GB RAM 1152 cuda cores
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          #5
          Yes, that fixed it, it all works now and it survived a reboot. Thank you very much.
          In the interest of learning, any idea how and why it messed up like this?
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            #6
            Originally posted by deathromantik View Post
            Yes, that fixed it, it all works now and it survived a reboot. Thank you very much.
            In the interest of learning, any idea how and why it messed up like this?
            I'm not totally sure , but this is where "kscreen" keeps previously used settings and I do know that I got stuck with "unified" displays on my external (TV) and doing this fixed it for me .

            glad it helped you

            VINNY
            i7 4core HT 8MB L3 2.9GHz
            16GB RAM
            Nvidia GTX 860M 4GB RAM 1152 cuda cores
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              #7
              I am guessing the installer does something wrong on laptops with my configuration, since results were totally different depending if I installed with the HDMI monitor plugged in or not. I might give it another test later on.
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