Re: [Xen-users] UEFI-booted Xen turns into black screen after boot

[Michael Fabian Dirks <michael.fabian.dirks@xxxxxxxxx>]

> Hello,
>
> I tried getting Xen running on my system (Debian Testing, 64-bit, UEFI only 
> :( ) however I continuously get stuck after loading the kernel. I've added 
> Xen.efi to /boot/efi/EFI/Xen and made an EFI boot configuration for it too - 
> it loads the kernel, does something really fast (can't even read it with a 
> camera) and then it just goes to a black screen.
>
> System Info:
> - /proc/version: Linux version 4.4.0-1-amd64 (debian-kernel@xxxxxxxxxxxxxxxx) 
> (gcc version 5.3.1 20160307 (Debian 5.3.1-11) ) #1 SMP Debian 4.4.6-1 
> (2016-03-17)
> - /proc/cmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-1-amd64 
> root=UUID=a393c438-34cb-4237-be26-986ce78e960b ro quiet
> - /proc/cpuinfo: http://pastebin.com/GbsgARg2
> - /proc/meminfo: http://pastebin.com/nRWj4zr7
> - /boot/efi/EFI/Xen/xen.cfg: http://pastebin.com/UGPnhz8x
>
> Hardware Info (if necessary):
> - ASRock 970 Pro3
> - 2x 1TB HDD in UEFI-RAID configuration (no SATA/AHCI boot possible with this)
> - AMD Radeon R9 285 with AMDGPU + mesa drivers
>
> I feel like I missed a critical step - like a configuration file somewhere 
> that tells Xen what to do. I couldn't find anything about this issue but I 
> think that's cause my search-fu is weak. I hope someone can help me here - I 
> tried finding log files but it doesn't look like any are created.
>
> Sincerely,
>
> Michael Fabian Dirks

I managed to capture the exact last thing that shows up on screen:
[    35.352491] xen: registering gsi 24 triggering 0 polarity 1
[    35.353174] Already setup the GSI :24
[    35.353819] checking generic (c0000000 12c000) vs hw (c000000
[    35.354518] fb: switching to amdgpudrmfb from simple

Immediately after the above line, the screen turns black. Do I have to
go back to the open source AMD drivers for Xen to work properly?

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