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#1 2020-09-04 18:54:08

From: Munich / Germany
Registered: 2018-03-20
Posts: 32  

Devuan-Beowulf Resolution, 4k-monitor, 10-bit.

- X399 motherboard, socket TR4
- Threadripper 1900, 8 CPUs 16 threads
- 64-GB RAM, 3.000 MHz
- Samsung 970 pro NVMe, 512-GB
- AMD Vega 64, 8-GB GPU-RAM
- Samsung 10-Bit deep display, native resolution 3.840x2.048
All the rest is also new, PSU, mouse, keyboard, case, even table and chair ;-)

- Installed Beowulf  alone (I use only Linux since 10 years) and from scratch on NVMe. At first reboot I got only black screen with cursor.
- Start the machine with a live system, check 'repository', chroot, make all updates, restart... same as above.
- Chroot it again enable 'backports', install 'firmware-amd-graphics', 'dpkg', update, upgrade, restart... nothing changes.
- 'startx' or 'startkde' don't help either.
- I can use the 'black screen' as 'konsole/terminal' to make update and all other things possible on normal terminal but can't start the UI.

I want definitely leave Kubuntu, Neon is too unstable, Xfce is not for us (200% scaling + flickering to reduce to 150%), MX-Linux is Xfce with sysvinit additionally can be installed kde but scale remain to 200%.

Making experiments with different OSs in the VB see amdgpu-pro drivers all OS recognize the right resolution, Beowulf don't.

Reading file:///var/log/Xorg.0.log  of all machine (real & virtual) something going wrong and need help.

Could someone tell me what and in which order I have to install in order to get the full 3840x2160 resolution?


#2 2020-09-04 19:03:11

Registered: 2020-05-05
Posts: 125  

Re: Devuan-Beowulf Resolution, 4k-monitor, 10-bit.


Have you tried with a more recent kernel from backports "apt -t beowulf-backports linux-image-amd64". And maybe do the same with firmware-amd-graphics. This support much more recent hardware than the default 4.19 kernel (late 2018 if i remember).

Have an nice day
Lars H


#3 2020-09-07 08:28:20

From: Munich / Germany
Registered: 2018-03-20
Posts: 32  

Re: Devuan-Beowulf Resolution, 4k-monitor, 10-bit.

Yes Sir, I did.
Here the instruction I collect, this is .md (Markdown) syntax... that in case could be useful for other users.
The (kernel) version I got is the 5.7. automatically choosen from beowulf-backports as well firmware-amd-graphics in the version '20200721' like all debian-dased-distros like MX-Linux, etc.

# Devuan 'backports', 'kernel-' and 'firmware-upgrade' [Link 1:]( [Link 2:](

1. This guide is for people want to get primarily newer drivers for graphic-cards, wifi, etc.
2. The new kernel will be installed alongside the already present-one. In case of problems you can start the "old-one" at boot time.

### Step 1. Detect actual kernel
* For this use `terminal` opening with (CTRL + ALT + T), Code:
uname -r
### Step 2. Enable 'backports' Code:
* Methode 1.:
sudo su

nano /etc/apt/sources.list
* Text to insert (leave one empty line at end) Code:
# Beowulf-Backports
deb beowulf-backports main contrib non-free
deb-src beowulf-backports main contrib non-free

* Save and close file:
 - Save with (CTRL + O), hit (Enter) to confirm
 - Close with (CTRL + X)

* Check results with code:
cat /etc/apt/sources.list
* Methode 2.:
 - Open Dolphin
 - Navigate to `/etc/apt/`
 - Open `sources.list` with `kate`
 - Copy and paste the 2-3 lines and leave one empty line at end.
 - Save (CTRL + S), insert password and (ENTER).
 - Close with (CTRL + W).

### Step 3. Update and Upgrade
** Note:** You are still `root`!
* read the new sources, Code:
apt update

apt -t beowulf-backports upgrade

 > or

apt-get update

apt-get -t beowulf-backports upgrade

apt-get install -f
* install `firmware-amd-graphics` (if not yet done), Code:
apt install -t beowulf-backports firmware-amd-graphics
* install new kernel, Code:
apt install -t boewulf-backports linux-image-amd64
* search for installed `linux-image`, Code:
apt list --installed linux-image*
 - output example (note newest installed):
Listing... Done
linux-image-4.19.0-10-amd64/stable,now 4.19.132-1 [installed, automatic]
linux-image-5.7.0-0.bpo.2-amd64/stable-backports,now 5.7.10-1~bpo10+1 amd64 [inistalled,automatic]
linux-image-amd64/stable-backports,now 5.7.10-1~bpo10+1 amd64 [installed]
* search for correlated `linux-headers`
apt search linux-headers-5.7.0*
 - output example:
Sorting... Done
Full Text Search... Done
linux-headers-5.7.0-0.bpo.2-amd64/stable-backports 5.7.10-1~bpo10+1 amd64
    Header files for Linux 5.7.0-0.bpo.2-amd64

linux-headers-5.7.0-0.bpo.2-cloud-amd64/stable-backports 5.7.10-1~bpo10+1 amd64
    Header files for Linux 5.7.0-0.bpo.2-cloud-amd64

linux-headers-5.7.0-0.bpo.2-commom-amd64/stable-backports 5.7.10-1~bpo10+1 all
    Header files for Linux 5.7.0-0.bpo.2    
* install `linux-headers`, Code:
apt install -t beowulf-backports linux-headers-5.7.0-0.bpo.2-amd64
* install the firmware, Code:
sudo apt install -t beowulf-backports firmware-linux firmware-linux-nonfree
### Step 4. Assure everything is installed correctly, Code:
apt-get update && apt-get upgrade && apt-get install -f && apt-get dist-upgrade && update-grub
* in case of error message..., Code:
dpkg --configure -a
 - alternatively, open `synaptic`-package-manager, click `Edit`, click `Fix Broken Packages`. Repeat the fix until no error-messages appear anymore.

* clean the system (optional), Code:
apt autoremove --purge
### Step 5. Reboot, Code:

 > or

shutdown -r now
* alternatively, use the GUI 
* switch-off command, Code:
shutdown -h now

The edid on real machine (Kubuntu) is perfect as well on VMs (without 'guest-iso-addition') using systemd, like MX-Linux-KDE and others.
By the way, I install also edid-decode and read-edid, but those apps read the edid-part of /var/log/Xorg.0.log. They don't read the edid from hardware.

I don't know which application read the hardware-edid and pass it to 'Xorg', 'xorg' same?
xrandr work ok, I can set there other resolution's but after a while of running the resolution fall back to 'xorg'-value.

Issuing the command sudo -i systemsettings5 (under all OS) and try to change resolution and scaling belong display-menu I get following out:

kscreen: Requesting missing EDID for outputs (71)

searching for '71' in file-manager I discover /lib/udev/rules.d/71-seat-rules, that's no good.

Reading many threads (for all Gentoo-threads, using and care-taking of 'openrc') about 'kscreen'-errors it appear to be a common error for OSs not using 'systemd' and maybe this is the reason, also for Gento, to issue latest stable without 'openrc'.

I look also for 'EDID' in the real installation (Kubuntu), the file-search don't bring any results but in a gentoo-thread I found where to be, this is /sys/class/drm/, in my case (using display-port-2) /sys/class/drm/card0-DP-2 but there only empty folders and files.

I install also beowulf with 'sysvinit', reading /var/log/Xorg.0.log no changes. This should be also the reason to get black screen with cursor like in a server under real conditions.

A 'step-by-step' instructions how to remedy or how to setup a proper 'xorg' is still missing on my side.

1. All OSs using 'systemd' blacklist: 'amd', 'intel' and 'nvidia' modules. How they get all EDID inside 'xorg' is a mistery for me.
2. Mouse, keyboards and thouch-phad are obsolete in 'xorg' (see xorg-wiki).
3. For a 30-40 years old 'xorg' that should be replaced (Wayland and/or + Systemd, maybe) are too few information about and each distribution make own things and place in different folders the config.files. That's not freedom, tha's confusion.

1. EDID-informations are given by hardware correctly because other ditros recognize them also perfectly even in VM/VB without 'guest-iso'.
2. All firmware (linux and amd) and kernel are up to date from 'beowulf-backports' (see instructions).
3. No seldom hardware, all amd and samsung, see list above.
4. We cannot blame 'openrc', 'syvinit' bring exact the same results= missing resolution-information in the /var/log/Xorg.0.log.
5. Other distro's (e.g. MX-Linux-KDE) recognize available resolution and let modify/change it latest by installing 'kde-full' and use 'sddm' as choosen, devuan don't. This (Devuan) stick with slim at start, does that make a difference? Former installation where the choice was between lightdm and sddm present the same slick slim or lightdm screen.


#4 2020-09-16 19:40:13

Registered: 2020-09-16
Posts: 2  

Re: Devuan-Beowulf Resolution, 4k-monitor, 10-bit.

You can change your resolution quickly with the "arandr" application. Check it out.
Arandr works really well for resizing VirtualBox screens too.

If you are trying to adjust your HiDPI settings keep in mind that you are probably trying to scale 3 different GUI toolkits: GTK2, GTK3, and Qt5.

GTK2 does not have any builtin HiDPI settings. There are a some pretty good HiDPI hacks that work ok for GTK2 though.
GTK3 applications do NOT scale very well (my opinion). As you have already noted GTK3 will only scale with an integer value. (Correction: GTK3 can scale fonts using a non-integer relative to the currenly set 'GDK SCALE' value.)
QT5 has the best scaling. It will scale to integer or non-integer values.

Here is how I have manually set up the scaling for Qt5 and GTK3 Apps for my 4K Screen.
All of the settings are in my '$HOME/.xsessionrc' since I am currenly using an either JWM or Openbox.

# GTK-3 Scaling
GDK_SCALE=2 export GDK_SCALE                   

$ Qt5 Scaling
export QT_SCALE_FACTOR=1.9

Those settings achive pretty good results.

Here is a good reference:

Hopefully that addresses some of your concerns.

Last edited by jay00 (2020-09-16 20:05:56)


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