How to load different version of radeon driver?

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1

Continuing the discussion from F34 hanging after boot:

From the bugzilla entry, it is suggested that the problem might be on the radeon driver.

How can I find and load different version of the radeon driver to see if it helps?

00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Kaveri [Radeon R7 Graphics] (pro
g-if 00 [VGA controller])
	Subsystem: Gigabyte Technology Co., Ltd Device d000
	Flags: bus master, fast devsel, latency 0, IRQ 46, IOMMU group 0
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at d0000000 (64-bit, prefetchable) [size=8M]
	I/O ports at f000 [size=256]
	Memory at feb00000 (32-bit, non-prefetchable) [size=256K]
	Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: radeon
	Kernel modules: radeon, amdgpu
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I just searched AMD’s website and found this:

Unfortunately, it says it only works with Linux kernels up to version 3.19

I think your card is one of the “Southern Islands” series:

It looks like there has been recent support added for them in the Linux open source amdgpu driver:

Arch’s Wiki has some notes on how to enable the experimental support for southern islands cards:

ArchWiki - AMDGPU

You might try passing si_support=1 to the amdgpu driver. I think you would need to create a .conf file under /etc/modprobe.d containing the following line:

options amdgpu si_support=1
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3

Thanks for looking into my issue!

Yes, I am trying to use amdgpu instead of radeon to see if it makes a difference.

I created /etc/modprobe.d/amdgpu.conf
options amdgpu si_support=1

But lspci -v still shows radeon is still in use.

According to ArchWiki:

Specify the correct module order

Even when AMDGPU support for SI/CIK has been enabled by the kernel, the radeon driver may be loaded before the amdgpu driver.

Make sure amdgpu has been set as first module in the Mkinitcpio#MODULES array, e.g. MODULES=(amdgpu radeon) .

Fedora uses dracut instead of mkinitcpio. I have no idea how this module ordering can be specified in dracut.

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4

The only thing I’m aware of is the rd.driver.pre= kernel parameter (see man dracut.cmdline). I think you’d have to be sure the amdgpu kernel module (and your custom .conf file) is included in dracut.

Also, it looks like the radeon module also takes the si_support=1 parameter. If the system requires both modules, you may need to specify that option for both of them.

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5

I tried:

rd-driver.pre=amdgpu rd.driver.blacklist=radeon boot parameters
and created /etc/modprobe.d/amdgpu.conf
options amdgpu si_support=1
options radeon si_support=1

After reboot, lspci -v still reporting:
Kernel driver in use: radeon

And gdm still hanging on start.

6

Did you regenerate the initramfs? I think for rd.driver.pre to work, the module(s) must be in the initramfs. Also, it looks like you might have misspelled rd.driver.pre.

7

I successfully load the amdgpu driver with

$ cat /proc/cmdline 
BOOT_IMAGE=(hd0,gpt2)/vmlinuz-5.11.21-300.fc34.x86_64 root=UUID=bda68cec-a76d-4e6a-be52-fefcff9f76a6 ro rootflags=subvol=root amdgpu.dc=0 radeon.cik_support=0 radeon.si_support=0 amdgpu.cik_support=1

So it turns out A10-K7850K is using Sea Islands graphics instead of South Islands graphics.

Now my lspci -v reads:

00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Kaveri [Radeon R7 Graphics] (prog-if 00 [VGA cont
roller])
	Subsystem: Gigabyte Technology Co., Ltd Device d000
	Flags: bus master, fast devsel, latency 0, IRQ 48, IOMMU group 0
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at d0000000 (64-bit, prefetchable) [size=8M]
	I/O ports at f000 [size=256]
	Memory at feb00000 (32-bit, non-prefetchable) [size=256K]
	Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [48] Vendor Specific Information: Len=08 <?>
	Capabilities: [50] Power Management version 3
	Capabilities: [58] Express Root Complex Integrated Endpoint, MSI 00
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
	Capabilities: [270] Secondary PCI Express
	Capabilities: [2b0] Address Translation Service (ATS)
	Capabilities: [2c0] Page Request Interface (PRI)
	Capabilities: [2d0] Process Address Space ID (PASID)
	Kernel driver in use: amdgpu
	Kernel modules: radeon, amdgpu

And GDM started OK.

Thank you very much for your continued support!

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8

very cool ! I have a Pitcairn series Radeon as well and a Kaveri CPU !

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9

How can I reproduce this on my system ?? I’m using an AMD A6-7310 APU on my laptop.

10

You need to find out if yoour chip is Sea Islands of Southern Islands. And add the kernel boot parameter accordingly.

11

What command should I use to know that ??

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The most secure way to find out is by testing the two set of parameters - and see which one worked.

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I determine it by looking in these charts, especially sections 5-10.

https://www.x.org/wiki/RadeonFeature/

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