Re: GDM failed to start

Thursday, 20 May 2021

It turns out the problem is with the radeon driver.

The GDM can be started normally once amdgpu is used instead of radeon

$ cat /proc/cmdline 
BOOT_IMAGE=(hd0,gpt3)/ostree/fedora-b84e4d88fe04fad4bc33b6ea17b973b4c73cd56c60843527323ed31290b71b6c/vmlinuz-5.11.20-300.fc34.x86_64
root=UUID=6d7c04a4-98c4-4438-96f8-b3fcd570c27a rootflags=subvol=root35b
ostree=/ostree/boot.0/fedora/b84e4d88fe04fad4bc33b6ea17b973b4c73cd56c60843527323ed31290b71b6c/0
radeon.cik_support=0 amdgpu.cik_support=1

00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Kaveri [Radeon
R7 Graphics] (prog-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: [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