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Radeon 4670 support

May 18, 2020

Radeon 4670 support

Problem is a blank screen during and after startup. The BIOS boot logo can be seen correctly.

Official Hardware Support ends

But the open source driver is available (with some missing features)

Open Source AMD Radeon Ubuntu Driver
The Open Source AMD Radeon Ubuntu Driver is already installed on your system by default
and out of the box. They're integrated into Mesa and the Linux kernel. There is nothing
further you need to do in order to start using your AMD Radeon card. In this scenario
you may not be on the bleeding edge in terms of the latest AMD Radeon driver version,
but your system will benefit from an increased stability and painless automatic driver


Getting information

lshw -c video
dmesg | grep -i amdgpu

To get the name and current status of connectors, you can use the following shell oneliner:

$ for p in /sys/class/drm/*/status; do \
    con=${p%/status}; echo -n "${con#*/card?-}: "; \
    cat $p; \
DVI-I-1: connected
HDMI-A-1: disconnected
VGA-1: disconnected

The format is:

<conn>: Connector, e.g. DVI-I-1, see /sys/class/drm/ for available connectors
<xres> x <yres>: resolution
M: compute a CVT mode?
R: reduced blanking?
-<bpp>: color depth
@<refresh>: refresh rate
i: interlaced (non-CVT mode)
m: margins?
e: output forced to on
d: output forced to off
D: digital output forced to on (e.g. DVI-I connector)

You can override the modes of several outputs using video= several times, for instance, to force DVI to 1024x768 at 85 Hz and TV-out off:

video=DVI-I-1:1024x768@85 video=TV-1:d

Check available modes (for open source drivers)

$ xrandr -q

Check available framebuffer modes

$ hwinfo --framebuffer
glxinfo -B

Check loaded kernel modules

lsmod | grep amd


Check boot messages:


Xorg log:

cat /var/log/Xorg.0.log

Disable modesetting

  • /etc/default/grub

Add radeon.modeset=0 to this line:


that it reads: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=0"

Then execute :