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Radeon graphics work with 4.19.0-8 but not 4.19.0-9

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I installed a Radeon WX 3100 a few days ago on my buster system. It failed to bring up the X server. I installed the proprietary drivers from AMD's site, but still no dice.  Just for fun I tried to boot the previous kernel 4.19.0-8 and the system worked fine.

I have install the amd-graphics-firmware from buster backports version 20190717-2.  Also installed xserver-xorg-video-amdgpu version 18.1.99+git20190207-1. 

I have reconfigured the kernel and ran update-initramfs.  Also purged the amdgpu xorg driver and reinstalled.

Any ideas on how to get the system to run X with the 4.19.0-9 kernel.


log snippet from xorg log on 4.19.0-9  - failed
[    60.114] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[    60.116] (--) PCI:*(1@0:0:0) 1002:6985:103c:0b0e rev 0, Mem @ 0xe0000000/268435456, 0xf0000000/2097152, 0xf7e00000/262144, I/O @ 0x0000e000/256, BIOS @ 0x????????/131072
[    60.116] (II) LoadModule: "glx"
[    60.116] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    60.116] (II) Module glx: vendor="X.Org Foundation"
[    60.116]    compiled for 1.20.4, module version = 1.0.0
[    60.116]    ABI class: X.Org Server Extension, version 10.0
[    60.116] (==) Matched ati as autoconfigured driver 0

drm is not loaded and amdgpu is not matched

log snippet from xorg log on 4.19.0-8 - worked OK
[    54.191] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[    54.191] (II) xfree86: Adding drm device (/dev/dri/card0)
[    54.203] (--) PCI:*(1@0:0:0) 1002:6985:103c:0b0e rev 0, Mem @ 0xe0000000/268435456, 0xf0000000/2097152, 0xf7e00000/262144, I/O @ 0x0000e000/256, BIOS @ 0x????????/131072
[    54.204] (II) LoadModule: "glx"
[    54.240] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    54.500] (II) Module glx: vendor="X.Org Foundation"
[    54.500]    compiled for 1.20.4, module version = 1.0.0
[    54.500]    ABI class: X.Org Server Extension, version 10.0
[    54.500] (II) Applying OutputClass "AMDgpu" to /dev/dri/card0
[    54.500]    loading driver: amdgpu
[    54.500] (==) Matched amdgpu as autoconfigured driver 0
[    54.500] (==) Matched ati as autoconfigured driver 1


thanks

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Radeon graphics work with 4.19.0-8 but not 4.19.0-9 Scott Lair <scott@lairhome.com> - 2020-06-24 02:20 +0200
  Re: Radeon graphics work with 4.19.0-8 but not 4.19.0-9 Scott Lair <scott@lairhome.com> - 2020-06-24 15:10 +0200

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