Re: AMD Ryzen 4750U Laptop Screen Black (Xen 4.13.1)

[Chris Laprise <tasket@xxxxxxxxxx>]

On 8/12/20 8:19 PM, Dylanger Daly wrote:
> Hi Xen Users!
>
> I'm currently running Qubes 4.1 (Xen 4.13.1 
> <https://github.com/xen-project/xen/commits/RELEASE-4.13.1>) on an AMD 
> Ryzen 4750U APU, the specific laptop is a Lenovo X13 (AMD).
> I can see Xen boot up, however when dom0 boots, I don't see any output. 
> I speculate this is because dom0 can't write/map into the UMA Framebuffer.
> This seems to be related to UMA / iGPU Memory Management.
>
> efifb: cannot reserve video memory at 0x60000000
> efi: EFI_MEMMAP isnot enabled
>
> I can't seem to see any AMD/Ryzen specific commits that are newer than 
> 4.13.1, I was looking at cherry picking Xen commits related to AMD/Ryzen 
> however I can't find any.
I am in the same situation, and have started exploring Qubes under VBox 
as a temporary strategy for migrating to the new, much faster machine 
(which in my case is a Thinkpad T14 also with Ryzen 4750U)... although I 
would much prefer to get Xen/Qubes working properly on the new hardware.
--
Chris Laprise, tasket@xxxxxxxxxx
https://github.com/tasket
https://twitter.com/ttaskett
PGP: BEE2 20C5 356E 764A 73EB  4AB3 1DC4 D106 F07F 1886