[Bug 209159] New: AMD Vega 20 framebuffer switch fails on 5.9rc2+

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=209159

            Bug ID: 209159
           Summary: AMD Vega 20 framebuffer switch fails on 5.9rc2+
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.9-rc2/3
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: ryan at testtoast.com
        Regression: No

Created attachment 292349
  --> https://bugzilla.kernel.org/attachment.cgi?id=292349&action=edit
lspci

Vega 20 (Radeon VII) on X99 platform - boot freezes during FB switch. Booting
without quiet and with earlyprintk=efi,keep shows a stall immediately after

...
[    1.941238] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel at suse.de>
[    1.941239] AMD-Vi: AMD IOMMUv2 functionality not available on this system
[    1.948454] nvme nvme0: 20/0/0 default/read/poll queues
[    1.953176]  nvme0n1: p1 p2 p3 p4 p5 p6 p7
[    1.956313] usb 1-14: new full-speed USB device number 5 using xhci_hcd
[    1.989790] [drm] amdgpu kernel modesetting enabled.
[    1.989849] CRAT table not found
[    1.989850] Virtual CRAT table created for CPU
[    1.989857] amdgpu: Topology: Add CPU node
[    2.006244] checking generic (c0000000 300000) vs hw (c0000000 10000000)
[    2.006246] fb0: switching to amdgpudrmfb from EFI VGA


On -rc1 boot continues normally with
...
[    2.006315] amdgpu 0000:67:00.0: vgaarb: deactivate vga console
[    2.006345] amdgpu 0000:67:00.0: enabling device (0106 -> 0107)
[    2.006408] [drm] initializing kernel modesetting (VEGA20 0x1002:0x66AF
0x1002:0x081E 0xC1).
...

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