Linux 4.17 To Enable AMDGPU DC By Default For All Supported GPUs

[nuetzel]

I can't get running my father's A10-7860K on openSUSE Leap 43.2 stable, currently.
Have to send some logs over the right way...

[Etherman]

I would be glad to see a tutorial on how to enable it manually with 4.15 since we won't see 4.17+ until Ubuntu 18.10.
I have no clue about how to set boot parameters. If you know it this may be simple.
But if you don't you will get a headache after a few minutes of research.

Also maybe a test on how Freesync support works and how it compares to Windows

1. open terminal, write "sudo nano /etc/default/grub" (without quotes), press return.
2. navigate to "GRUB_CMDLINE_LINUX_DEFAULT=" line using arrow keys and add parameters to the line.
3. press ctrl+x to save file
4. type "sudo update-grub" in the terminal to enable changes.

[Jumbotron]

Hmmm...I don't see a reply button on mobile site...so anyway Thanks Bridgman for the info. Does this also mean AMDGPU will be the default now for GCN 1.1 era GPUs when I install Ubuntu 18.04 ?

[Marc Driftmeyer]

Config: Polaris RX 480
System: Debian Sid
Kernel: Linux 4.15.0-1-amd64
Source: /etc/default/grub

$ sudo vim /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet iommu=pt iommu=1 amdgpu.dc=1 amdgpu.audio=1"
#GRUB_CMDLINE_LINUX="text"
#GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xe fefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

$ sudo update-grub
$ sudo reboot

[miklosh]

Unfortunately I have serious problems with the flicker and gap of the screen with dc=1 on my RX 480 and a display with freesync support (lg 34uc88-b, displayport connection). kernel 4.15.7. I hope in 4.16 / 4.17 this will fix.

[humbug]

Hmmm...I don't see a reply button on mobile site...so anyway Thanks Bridgman for the info. Does this also mean AMDGPU will be the default now for GCN 1.1 era GPUs when I install Ubuntu 18.04 ?

exactly what I want to know as well.

[pcxmac]

I would be glad to see a tutorial on how to enable it manually with 4.15 since we won't see 4.17+ until Ubuntu 18.10.
I have no clue about how to set boot parameters. If you know it this may be simple.
But if you don't you will get a headache after a few minutes of research.

Also maybe a test on how Freesync support works and how it compares to Windows

modinfo amdgpu

[Space Beer]

Hmmm...I don't see a reply button on mobile site...so anyway Thanks Bridgman for the info. Does this also mean AMDGPU will be the default now for GCN 1.1 era GPUs when I install Ubuntu 18.04 ?

I don't think so, since it comes with 4.15 kernel. Probably after next upgrade (18.04.1 or 18.04.2)

[Aleksei]

Nice to see continuous improvements in AMD opensource drivers. This is why I switched from Nvidia to AMD recently.

[bridgman]

Thanks Bridgman for the info. Does this also mean AMDGPU will be the default now for GCN 1.1 era GPUs when I install Ubuntu 18.04 ?

I would say that enabling DC by default in amdgpu is a pre-requisite for enabling amdgpu by default - don't think it would make sense for them to happen together. At this point Mr Cooper usually reminds me about the other pre-requisite I'm forgetting...