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#1 2018-02-11 11:15:21

daemilevs
Member
Registered: 2018-02-11
Posts: 6

HDMI monitor not detected r9 380x

I have a triple monitor setup with 1 hdmi monitor in the middle and 2 dvi monitors on the side. I am using an r9 380x and a ryzen 7 1700.
the problem is that my hdmi monitor isn't detected and it doesn't show up in my xrandr. Most people online tell me to edit my xorg.conf but Xorg -configure returns a segmentation fault, this is why I created 20-radeon.conf manually containing:
Section "Device
    Identifier "AMD"
    Driver "amdgpu"
EndSection
as described in https://wiki.archlinux.org/index.php/AMDGPU

but in this gives me A "failed to load module amdgpu module does not exist" when running startxfce4

lspci -V gives me:
/amdgpu
...skipping
    Kernel driver in use: amdgpu
    Kernel modules: amdgpu
so I tought it should have something

(this is on a fresh arch installation)

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#2 2018-02-13 19:23:30

daemilevs
Member
Registered: 2018-02-11
Posts: 6

Re: HDMI monitor not detected r9 380x

switching to a lts kernel fixed the problem

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#3 2018-02-15 13:50:31

pr0dukter
Member
Registered: 2017-08-24
Posts: 54

Re: HDMI monitor not detected r9 380x

i have the same hardware AND setup as you, a hdmi 1080p tv/monitor and 2 dell lcds rotated 90 deg ccw and then

#/bin/sh

#if [ $# -eq 12 ]
# # then
    b1=1
    b2=1
    b3=1
    g1=1
    g2=1
    g3=1
    g4=1
    g5=1
    g6=1
    g7=1
    g8=1
    g9=1
#  else
#        b1=$1        b2=$5        b3=$9        g1=$2        g2=$3
#        g3=$4        g4=$6        g5=$7        g6=$8        g7=$10        g8=$11        g9=$12
#fi

xrandr  --fb 4400x1500 --output 0x58 --mode 0x75 --pos 0x92 --scale 1x0.82 --rotate right --dpi 110 --gamma ${g1}:${g2}:${g3} --brightness ${b1} --output 0x56 --mode 0x5a --primary --brightness ${b2} --dpi 166 --gamma ${g4}:${g5}:${g6} --pos 1024x40 --output 0x57 --mode 0x73 --dpi 110 --gamma ${g7}:${g8}:${g9}  --brightness ${b3} --pos 2950x8 --scale 1x0.799 --rotate right

forgive the crudeness was one of my first scripting endeavours

as you can see i eventually hardcoded the math to get it close as possible on the scaling difference between screens as far right screen is 1440x900 while far left is 1280x1024  everything at 60hz.

finally my point, have you found any kind of resource for amdgpu's bleeding edge kernel module options for scaling, deep color, and atom? and what are you doing for a hdmi audio solution?  i have all flags go but cant pull audio except for an occasional burst of static on boot.

and yes the linux-4.15-arch kernel only 2 of 3 screens work even though xrandr shows all connected.  linux-ck-bulldozer works like a champ for 3 screens, hoping jump to 4.15 finally solves dc hdmi audio issue that says is already backported into it.  also lts has worked for 3 screens 95 percent of the time. but at  one point it didnt and linux-amd-staging was the go to kernel.

cheers

Last edited by pr0dukter (2018-02-15 13:53:14)

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