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Thread: RX480 wrong resolution after kernel update to 4.15

  1. #1
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    Question RX480 wrong resolution after kernel update to 4.15

    My kernel got updated from 4.14 to 4.15 and now I can't choose my native resolution anymore. When searching google I found out that 4.15 introduces AMD Display Code, could this have something to do with it?

    GPU: AMD RX480 / Polaris
    OpenSuse version: 42.2
    kernel version: kernel-default-4.15.1-2.1.g9df97e2
    kernel repo: http://download.opensuse.org/reposit...able/standard/

  2. #2

    Default Re: RX480 wrong resolution after kernel update to 4.15

    Quote Originally Posted by ekj View Post
    When searching google I found out that 4.15 introduces AMD Display Code, could this have something to do with it?
    What exactly do you mean with that?
    There definitely was "AMD Display Code" in there before...

    Maybe post /var/log/Xorg.0.log, that might show something.

    GPU: AMD RX480 / Polaris
    OpenSuse version: 42.2
    kernel version: kernel-default-4.15.1-2.1.g9df97e2
    kernel repo: http://download.opensuse.org/reposit...able/standard/
    Any particular reason why you use that kernel?
    The standard one should work fine, no?

    Btw, 42.2 is end-of-life since over a week. You'd better upgrade.

  3. #3
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    Default Re: RX480 wrong resolution after kernel update to 4.15

    Can you show us what 'xrandr' reports? Perhaps also share your Xorg.0.log - upload it to https://paste.opensuse.org/ and post the URL that it generates here.

  4. #4

    Default Re: RX480 wrong resolution after kernel update to 4.15

    Quote Originally Posted by wolfi323 View Post
    What exactly do you mean with that?
    There definitely was "AMD Display Code" in there before...
    Ah ok, you probably mean this:
    https://www.phoronix.com/scan.php?pa...DC-Rebased-600

    But AIUI that shouldn't make a difference for older GPUs including Polaris...
    According to the Arch Wiki you'd explicitly need to enable it:
    https://wiki.archlinux.org/index.php...pre-Vega_cards
    Last edited by wolfi323; 05-Feb-2018 at 14:57.

  5. #5
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    Default Re: RX480 wrong resolution after kernel update to 4.15

    Quote Originally Posted by wolfi323 View Post
    Ah ok, you probably mean this:
    https://www.phoronix.com/scan.php?pa...DC-Rebased-600

    But AIUI that shouldn't make a difference for older GPUs including Polaris...
    According to the Arch Wiki you'd explicitly need to enable it:
    https://wiki.archlinux.org/index.php...pre-Vega_cards
    For some reason Yast freezes when I open the Bootloader settings and swap to the Kernel Parameters tab. I tested both the GUI and the ncurses version, both freezes. So how else can I set the kernel parameter?

    The reason for using this kernel is that RX480 is not supported in kernel 4.4, I need at least 4.7 or so.

    xrandr output:
    Code:
    Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
    DP-1 disconnected (normal left inverted right x axis y axis)
    DP-2 disconnected (normal left inverted right x axis y axis)
    HDMI-1 disconnected (normal left inverted right x axis y axis)
    HDMI-2 disconnected (normal left inverted right x axis y axis)
    DVI-D-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
       1920x1200     59.95* 
       1920x1080     60.00  
       1600x1200     75.00    70.00    65.00    60.00  
       1680x1050     59.88  
       1400x1050     74.76    59.98  
       1280x1024     75.02    60.02  
       1280x960      60.00  
       1280x800      59.91  
       1152x864      75.00  
       1024x768      75.05    60.04    75.03    70.07    60.00  
       960x720       75.00    60.00  
       928x696       75.00    60.05  
       896x672       75.05    60.01  
       832x624       74.55  
       800x600       75.00    70.00    65.00    60.00    72.19    75.00    60.32    56.25  
       700x525       74.76    59.98  
       640x512       75.02    60.02  
       640x480       60.00    75.00    72.81    75.00    59.94  
       720x400       70.08  
       576x432       75.00  
       512x384       75.03    70.07    60.00  
       416x312       74.66  
       400x300       72.19    75.12    60.32    56.34  
       320x240       72.81    75.00    60.05
    The native resolution is 2560x1440.

    Xorg.0.log: https://paste.opensuse.org/99122249

  6. #6
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    Default Re: RX480 wrong resolution after kernel update to 4.15

    Well the EDID reports the following maximum display resolution capability...
    Code:
    [    23.580] (II) modeset(0): Printing probed modes for output DVI-D-1[     23.580] (II) modeset(0): Modeline "1920x1200"x60.0  154.00  1920  1968 2000 2080  1200 1203 1209 1235 +hsync -vsync (74.0 kHz e)

  7. #7
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    Default Re: RX480 wrong resolution after kernel update to 4.15

    This thread may be of interest to you (including last few posts in that thread re Xorg repo)
    https://forums.opensuse.org/showthre...n-RX400-Series

  8. #8

    Default Re: RX480 wrong resolution after kernel update to 4.15

    I have something like this problem.

    After i switch monitor off and on resolution changes from 3840x2160 to something like 1300x1000,
    and xrandr forget all my settings and only allow 1300x1000 and lower.

    Linux localhost 4.15.0-1-default #1 SMP PREEMPT Wed Jan 31 07:03:28 UTC 2018 (ac01747) x86_64 x86_64 x86_64 GNU/Linux
    and amdgpu with rx560

  9. #9
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    Default Re: RX480 wrong resolution after kernel update to 4.15

    Quote Originally Posted by ekj View Post
    For some reason Yast freezes when I open the Bootloader settings and swap to the Kernel Parameters tab. I tested both the GUI and the ncurses version, both freezes. So how else can I set the kernel parameter?
    At least in the GUI version, https://bugzilla.opensuse.org/show_bug.cgi?id=1073201 is the reason for the freeze, a problem with video probing.

    Any chance you can use a DisplayPort instead of DVI? DP often works much better than DVI-D DL on my 2560x1080 screen.

  10. #10

    Default Re: RX480 wrong resolution after kernel update to 4.15

    You can also set the boot parameters directly in /etc/default/grub with a text editor (GRUB_CMDLINE_LINUX_DEFAULT). You'd need to run "sudo grub2-mkconfig -o /boot/grub2/grub.config" to apply the change.
    (that's basically what YaST is doing as well)

    Or press 'e' at the boot menu to edit the menu entry in place, but this only affects the current boot and won't get saved.

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