X11 AMDGPU driver doesn't get loaded

[Jung-uk Kim]

On 20. 8. 21., Bakul Shah wrote:
> On a Motile M142 with Ryzen 5 3500U, amdgpu.ko and amdgpu_*.ko firmware
> gets loaded fine on boot -- installed from ports/graphic/drm-devel-kmod
> as I am running -current. [the port compiled from the exact same kernel
> sources as /boot/kernel/*]
> 
> But when I try to start X11, Xorg.0.log shows this:
> 
> (EE) modeset(0): [DRI2] No driver mapping found for PCI device 0x1002 / 0x15d8
> (EE) modeset(0): Failed to initialize the DRI2 extension.
> 
> and it tried to load the framebuffer driver, which works fine. AIUI
> it should be loading /usr/local/lib/xorg/modules/drivers/amdgpu_drv.so
> 
> The PCI vendor/device IDs are correct. I added a relevant entry for my
> laptop in /usr/local/share/pciids/pci.ids but ktrace reveals the
> pci.ids file is never accessed. I have been trying read Xorg code but
> wondering if there is an easier way to debug this. Or if I can simply
> specify loading the amdgpu_drv driver and bypass modesetting!
I have one of these in my laptop.

vgapci0 at pci0:4:0:0:     class=0x030000 rev=0xc2 hdr=0x00 vendor=0x1002
device=0x15d8 subvendor=0x17aa subdevice=0x3802
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Picasso'
    class      = display
    subclass   = VGA

Actually, I am running current on this laptop and
graphics/drm-devel-kmod works just fine.

[    21.082] (II) AMDGPU(0): [KMS] Kernel modesetting enabled.
[    21.086] (WW) Falling back to old probe method for modesetting
[    21.086] (WW) Falling back to old probe method for scfb
[    21.086] scfb trace: probe start
[    21.086] scfb trace: probe done
[    21.086] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card
support
[    21.087] (II) AMDGPU(0): Creating default Display subsection in
Screen section
        "Default Screen Section" for depth/fbbpp 24/32
[    21.087] (==) AMDGPU(0): Depth 24, (--) framebuffer bpp 32
[    21.087] (II) AMDGPU(0): Pixel depth = 24 bits stored in 4 bytes (32
bpp pixmaps)
[    21.087] (==) AMDGPU(0): Default visual is TrueColor
[    21.087] (==) AMDGPU(0): RGB weight 888
[    21.087] (II) AMDGPU(0): Using 8 bits per RGB (8 bit DAC)
[    21.087] (--) AMDGPU(0): Chipset: "Unknown AMD Radeon GPU" (ChipID =
0x15d8)
...
[    21.487] (II) AMDGPU(0): glamor X acceleration enabled on AMD RAVEN
(DRM 3.35.0, 13.0-CURRENT, LLVM 9.0.1)
[    21.487] (II) AMDGPU(0): glamor detected, initialising EGL layer.
[    21.487] (==) AMDGPU(0): TearFree property default: auto
[    21.487] (==) AMDGPU(0): VariableRefresh: disabled
[    21.487] (II) AMDGPU(0): KMS Pageflipping: enabled
...

I think you need to install both x11-drivers/xf86-video-ati and
x11-drivers/xf86-video-amdgpu to make it work.

Jung-uk Kim