Comment # 3 on bug 1188954 from Felix Miata

Created attachment 851463 [details]
Xorg.0.log booted without radeon.cik_support=0 amdgpu.cik_support=1

(In reply to Stefan Dirsch from comment #2)
> Not sure why you want to enable Sea Islands (CIK)  support in amdgpu kernel
> driver. I doubt it gets sufficient testing. 

10 months ago it (A10-7850K) worked at each boot just fine, as it does now once
xdm is restarted.  I have another Kaveri that still does work just fine,
without need to restart xdm first thing after booting:
# cat inxi-tw20210730.txt
# pinxi -SCzy
System:
  Kernel: 5.12.13-1-default x86_64 bits: 64 Desktop: Trinity R14.0.10
  Distro: openSUSE Tumbleweed 20210730
Machine:
  Type: Desktop Mobo: ASRock model: FM2A88X Extreme6+ serial: <filter>
  UEFI: American Megatrends v: P4.20 date: 01/13/2016
CPU:
  Info: Quad Core model: AMD PRO A8-8650B R7 10 Compute Cores 4C+6G bits: 64
  type: MCP cache: L2: 2 MiB
  Speed: 1396 MHz min/max: 1400/3200 MHz Core speeds (MHz): 1: 1396 2: 1392
  3: 1397 4: 1381
# pinxi -Gazy
Graphics:
  Device-1: AMD Kaveri [Radeon R7 Graphics] vendor: ASRock driver: amdgpu
  v: kernel alternate: radeon bus-ID: 00:01.0 chip-ID: 1002:1313
  class-ID: 0300
  Display: x11 server: X.Org 1.20.12 driver: loaded: amdgpu
  unloaded: fbdev,modesetting,vesa alternate: ati display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1200 s-dpi: 120 s-size: 406x254mm (16.0x10.0")
  s-diag: 479mm (18.9")
  Monitor-1: DisplayPort-0 res: 1920x1200 hz: 60 dpi: 94
  size: 519x324mm (20.4x12.8") diag: 612mm (24.1")
  OpenGL: renderer: AMD KAVERI (DRM 3.40.0 5.12.13-1-default LLVM 12.0.1)
  v: 4.6 Mesa 21.1.5 direct render: Yes
# systemd-analyze
Startup finished in 9.750s (firmware) + 23.795s (loader) + 1.952s (kernel) +
2.480s (initrd) + 3.207s (userspace) = 41.185s
multi-user.target reached after 3.145s in userspace
# dmesg | grep amdgpu
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz root=LABEL=zd8p07stw
noresume ipv6.disable=1 net.ifnames=0 mitigations=auto consoleblank=0
radeon.cik_support=0 amdgpu.cik_support=1 video=1024x768@60 video=1440x900@60 5
[    0.019636] Kernel command line: BOOT_IMAGE=/boot/vmlinuz
root=LABEL=zd8p07stw noresume ipv6.disable=1 net.ifnames=0 mitigations=auto
consoleblank=0 radeon.cik_support=0 amdgpu.cik_support=1 video=1024x768@60
video=1440x900@60 5
[    6.559662] [drm] amdgpu kernel modesetting enabled.
[    6.559836] amdgpu: Topology: Add APU node [0x0:0x0]
[    6.559894] fb0: switching to amdgpudrmfb from EFI VGA
[    6.560540] amdgpu 0000:00:01.0: vgaarb: deactivate vga console
[    6.560775] amdgpu 0000:00:01.0: amdgpu: Trusted Memory Zone (TMZ) feature
not supported
[    6.577972] amdgpu 0000:00:01.0: amdgpu: Fetched VBIOS from ROM BAR
[    6.577978] amdgpu: ATOM BIOS: 113-SPEC-102
[    6.578227] amdgpu 0000:00:01.0: amdgpu: VRAM: 1024M 0x000000F400000000 -
0x000000F43FFFFFFF (1024M used)
[    6.578231] amdgpu 0000:00:01.0: amdgpu: GART: 1024M 0x000000FF00000000 -
0x000000FF3FFFFFFF
[    6.578343] [drm] amdgpu: 1024M of VRAM memory ready
[    6.578347] [drm] amdgpu: 3072M of GTT memory ready.
[    6.586607] [drm] amdgpu: dpm initialized
[    6.861924] amdgpu 0000:00:01.0: amdgpu: SE 1, SH per SE 1, CU per SH 8,
active_cu_number 6
[    7.037007] fbcon: amdgpudrmfb (fb0) is primary device
[    7.490778] amdgpu 0000:00:01.0: [drm] fb0: amdgpudrmfb frame buffer device
[    7.525260] [drm] Initialized amdgpu 3.40.0 20150101 for 0000:00:01.0 on
minor 0

> I suggest to use radeon kernel module (default). Then possibly with "radeon"
> DDX, but "modesetting" should be fine as well, then using Mesa driver for
> acceleration via Glamor. If this fails as well, we can discuss again.

In comment #0 my last sentence would seem to have covered this. Anyway:
# inxi -SCMzy
System:
  Kernel: 5.13.4-1-default x86_64 bits: 64 Desktop: Trinity R14.0.10
  Distro: openSUSE Tumbleweed 20210730
Machine:
  Type: Desktop Mobo: ASUSTeK model: A88X-PRO v: Rev X.0x serial: <filter>
  UEFI: American Megatrends v: 2603 date: 03/10/2016
CPU:
  Info: Quad Core model: AMD A10-7850K Radeon R7 12 Compute Cores 4C+8G
  bits: 64 type: MCP cache: L2: 2 MiB
  Speed: 1689 MHz min/max: 1700/3700 MHz Core speeds (MHz): 1: 1689 2: 1700
  3: 1699 4: 1695
# inxi -Gazy
Graphics:
  Device-1: AMD Kaveri [Radeon R7 Graphics] vendor: ASUSTeK driver: radeon
  v: kernel alternate: amdgpu bus-ID: 00:01.0 chip-ID: 1002:130f
  class-ID: 0300
  Display: x11 server: X.Org 1.20.12 driver: loaded: modesetting
  unloaded: fbdev,vesa alternate: ati display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1200 s-dpi: 120 s-size: 406x254mm (16.0x10.0")
  s-diag: 479mm (18.9")
  Monitor-1: DP-1 res: 1920x1200 hz: 60 dpi: 94 size: 519x324mm (20.4x12.8")
  diag: 612mm (24.1")
  OpenGL: renderer: AMD KAVERI (DRM 2.50.0 5.13.4-1-default LLVM 12.0.1)
  v: 4.5 Mesa 21.1.5 direct render: Yes
# systemd-analyze
Startup finished in 5.901s (firmware) + 22.155s (loader) + 1.645s (kernel) +
2.238s (initrd) + 3.324s (userspace) = 35.265s
multi-user.target reached after 3.306s in userspace

I checked BIOS and found IOMMU was disabled. After enabling, dmesg got very
noisy using drm.debug=0x1e log_buf_len=1M, with the following repeated about 20
times:
[    8.376985] [drm:amdgpu_atombios_encoder_dpms [amdgpu]] encoder dpms 37 to
mode 3, devices 00000001, active_devices 00000000
[    8.387861] [drm:dce_v8_0_program_watermarks [amdgpu]] force priority to
high
[    8.388035] [drm:dce_v8_0_program_watermarks [amdgpu]] force priority to
high
[    8.388330] [drm:dce_v8_0_program_watermarks [amdgpu]] force priority to
high
[    8.388484] [drm:dce_v8_0_program_watermarks [amdgpu]] force priority to
high
[    8.388663] [drm:dce_v8_0_program_watermarks [amdgpu]] force priority to
high
[    8.388817] [drm:dce_v8_0_program_watermarks [amdgpu]] force priority to
high