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Thread: Screen resolution stuck at 800x600 on boot and login screen.

  1. #1
    Join Date
    Feb 2020
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    5

    Question Screen resolution stuck at 800x600 on boot and login screen.

    SOLVED. CHECK LAST POST
    Hi,
    I am running KDE Neon, which I suppose is the closest to Kubuntu so hopefully people here don't mind, and I also had same issue on Ubuntu 18.04.
    Now, my PC has problems with almost every Linux OS I tried (Ubuntu, Manjaro, Puppy, Mint, etc.) where the screen resolution won't go above 800x600 when running in VGA. In order to get 1920x1080 resolution I have to use xrandr and then everything is OK. Now I got to make xrandr apply it's setting when I login only, not while booting nor in login screen which bugs me alot as I can't see/reach many things. It's quite annoying and I can't find any solution for this.

    So my question is, how can I get my correct screen resolution before/during my OS boots so that I can see the login screen properly? Any helps would be appreciated, Thanks!

    Spec:
    Ryzen 3 2200G APU
    Vega 8 iGPU
    GIGABYTE A320M-S2h
    KDE Neon 5.17 (Same issue for Ubuntu 18.04 too)
    Last edited by tasnimtamim; February 10th, 2020 at 07:41 PM.

  2. #2
    Join Date
    Nov 2009
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    Hidden!
    Distro
    Kubuntu 18.04 Bionic Beaver

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    does it have same issues on 19.10? what about latest kernel? same issue? if yes, then it's not the drivers that are the issue.

    Have you tried installing amdgpu-pro drivers? though i am not sure they would help with screen resolution.

    problem is likely that VGA monitor is not passing the EDID or that EDID is not being read correctly.
    Read the easy to understand, lots of pics Ubuntu manual.
    Do i need antivirus/firewall in linux?
    Full disk backup (newer kernel -> suitable for newer PC): Clonezilla
    User friendly full disk backup: Rescuezilla

  3. #3
    Join Date
    Feb 2020
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    5

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    Haven't tried 19.10. Kernel is 5.3.0-28-generic and that's what I think is latest (could be wrong).

    Tried installing amdgpu-pro and now I'm having more problems than before. Resolution is not fixed nor auto detects unless I xrandr it. Now PC won't suspend properly, Ethernet keeps disconnecting while trying to connect, always has Power LED on, sudden graphics glitch and some theme is broken.

    I avoided installing amdgpu-pro because it didn't had Vega 8 or any Ryzen iGPU on supported list. Other than said problems and main problem not fixing, it didn't caused other problems than having this message at the end of installation "warning: amdgpu dkms failed for running kernel"

  4. #4
    Join Date
    Jan 2006
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    Distro
    Kubuntu 18.04 Bionic Beaver

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    You'll need to specify the information that would otherwise be provided by EDID. HorizSync and VertRefresh are generally sufficient for resolution calculations; you can normally get them from the monitor's manual or specifications page.

  5. #5
    Join Date
    Feb 2020
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    5

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    I am fairly newbie on Linux side, so I didn't got what you mean.

  6. #6
    Join Date
    Sep 2009
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    Pennsylvania
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    Xubuntu

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    How is the monitor connected to the PC: what cables / adapters are you using?

  7. #7
    Join Date
    Feb 2020
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    5

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    Through VGA cable of my motherboard. Linux detects it as DisplayPort-0.
    The monitor is a 19" no name brand. Windows 10 auto detects the monitor as 1400x900_75hz. Though I can manually add and get 1920x1080_73hz both on Linux and Windows.

  8. #8
    Join Date
    Jan 2006
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    Kubuntu 18.04 Bionic Beaver

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    Quote Originally Posted by tasnimtamim View Post
    I am fairly newbie on Linux side, so I didn't got what you mean.
    There are lots of posts already describing how to put that information in xorg.conf. You can search for them.

  9. #9
    Join Date
    Feb 2020
    Beans
    5

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    Finally got it working!! Thanks to CatKiler's suggestion.

    What I did:
    1. Created /etc/X11/xorg.conf.d/ directory
    2. Made a 10-monitor.conf file with these info:
    Section "Monitor"
    Identifier "DisplayPort-0"
    Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
    Option "PreferredMode" "1920x1080_60.00"
    EndSection

    Section "Screen"
    Identifier "Screen0"
    Monitor "DisplayPort-0"
    DefaultDepth 24
    SubSection "Display"
    Modes "1920x1080_60.00"
    EndSubSection
    EndSection

    Section "Device"
    Identifier "Device0"
    Driver "amdgpu"
    EndSection
    3. Reboot and done!

    Except boot animation, I get 1920x1080 output now on Login Screen! Don't care about boot part. Anyway thanks a lot to everyone on this thread

  10. #10
    Join Date
    Sep 2009
    Location
    Pennsylvania
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    3,267
    Distro
    Xubuntu

    Re: Screen resolution stuck at 800x600 on boot and login screen.

    You may want to try another VGA cable. The monitor's information is sent to the PC through one wire. If that wire is broken or a pain connection weak, the PC cannot determine the monitor's abilities. Also, some very cheap VGA cables don't even have that wire in them.

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