Blog/post/installing-ati-radeon-hd-6870-on-a-2560x1080-monitor-on-ubuntu-1004-focal
From happytrees.org
Hardware info
lshw -c video
*-display
description: VGA compatible controller
product: Barts XT [Radeon HD 6870]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:37 memory:d0000000-dfffffff memory:fbbc0000-fbbdffff ioport:b000(size=256) memory:c0000-dffff
lspci -k | grep -EA2 'VGA|3D'
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Barts XT [Radeon HD 6870]
Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Barts XT [Radeon HD 6870]
Kernel driver in use: radeon
linux-hardware: AMD Radeon HD 6870
Removing old drivers (for nvidia card)
sudo apt-get remove --purge '^nvidia-.*'
sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.bak
Video Drivers
- Use "radeon" driver
- "amdgpu" incompatable (only newer cards)
- "amdgpu-pro" incompatable (only newer cards)
- "frglx", obsolete, unmaintained since Ubuntu 12 or 13 or so
Cables
- DVI(Single Link) doesnt support greater than 1920x1080(FHD)
- DVI(Dual Link) might work, i didn't have one
- HDMI didn't support greater than 1920x1080(FHD), I guess the graphics card uses an older version of HDMI
- DisplayPort: I had to use a mini-Display Port(miniDP) to Display Port(DP) cable to get the full resolution
Check for Errors
dmesg | egrep 'drm|radeon'