ZetSama

median
добавил radeon в blacklist,

Начишуя?

median
и им плевать включен модуль radeon в mkinicpio или нет

Почитай, что такое mkinitcpio, прежде чем такую ерунду писать

Enable early KMS
Tip: If you have problems with the resolution, Kernel mode setting#Forcing modes and EDID may help.
Kernel mode setting (KMS) is supported by the amdgpu driver and is mandatory and enabled by default.

KMS is typically initialized after the initramfs stage. It is possible, however, to enable KMS during the initramfs stage. To do this, add the amdgpu module to the MODULES line in /etc/mkinitcpio.conf:

MODULES="... amdgpu ..."
Now, regenerate the initramfs:

# mkinitcpio -p linux
The change takes effect at the next reboot.
Loading
The amdgpu kernel module should load fine automatically on system boot.

If it does not happen, then:

Make sure you have the latest linux-firmware package installed. This driver requires the latest firmware for each model to successfully boot.
Make sure you do not have nomodeset or vga= as a kernel parameter, since amdgpu requires KMS.
Also, check that you have not disabled amdgpu by using any kernel module blacklisting.

Enable amdgpu for Sea Islands or Southern Islands cards
amdgpu has experimental support for Sea Islands (CIK) and Southern Islands (SI; since Linux 4.9) cards, which is disabled by default. One possible reason why you might want to enable it and switch from radeon to amdgpu is that AMD announced their user space Vulkan driver will only be supporting the new amdgpu stack [1]. Same might be the case for the new OpenCL driver, which was also mentioned in the XDC presentation.

If you want to enable amdgpu and use it with your Sea Islands or Southern Islands product, you have to recompile your kernel. Probably the easiest way to setup a custom kernel is using the ABS, described in Kernels/Arch Build System. You can also uncomment make menuconfig or make nconfig in the PKGBUILD, which will allow you to verify that the CIK option is selected by following the instructions from Gentoo wiki.

For Sea Islands (CIK), set "Enable amdgpu support for CIK parts" to "yes", then compile and install your kernel.

CONFIG_DRM_AMDGPU_CIK=Y
For Southern Islands (SI; since Linux 4.9), set "Enable amdgpu support for SI parts" to "yes", then compile and install your kernel.

CONFIG_DRM_AMDGPU_SI=Y
It may also be needed to use the amdgpu.exp_hw_support=1 [2] as kernel parameter or by setting the kernel module options.

Disable radeon driver
To prevent radeon from loading, you can disable it in the Kconfig or blacklist the radeon module.

/etc/modprobe.d/radeon.conf
blacklist radeon

Драйвер ati не работает. Совсем. Запускается только amdgpu

Ядро linux 4.12.8, драйвер amdgpu, kms включен. Конфиг sddm стандартный. В конфиге иксов только указание использовать драйвер amdgpu. Пакет xf86-video-radeon удален из системы.

redix

median
" у меня проблемы с nvidia "

Нет проблем, не надо выдумывать.