AMDGPU and kernel 5.19

[Kleber Souza]

Hi Mario,

On 20.01.23 04:28, Mario Limonciello wrote:
> Hi,
> 
> There is a problem in amdgpu that if not all of IP blocks are supported
> or not all of the firmware is present then the framebuffer is destroyed
> and the screen freezes.  In more recent kernels the amdgpu driver loads
> for all PCI VGA class AMD devices.
> 
> This effectively means that unless you have all the pieces you need to
> support a GPU then the installer freezes unless you do nomodeset.
> 
> This problem is to be fully fixed in kernel 6.3 with a ~47 patch series
> that is currently in drm-next.  This does two basic things:
> 1) If the IP blocks isn't supported, don't destroy the framebuffer.
> 2) If firmware for any IP blocks aren't present, don't destroy the
> framebuffer.
> 
> The whole patch series still needs more time to back in drm-next, but
> the most important part of the series is the first patch which
> accomplishes "1".
> 
> This patch went out to stable 6.1.y as well:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/amd?h=linux-6.1.y&id=dcfeba477b3e3df526e0f543b58fa71c045dff8b
> 
> As I recently saw a headline that the 22.04 5.19 based HWE stack was
> delayed, I strongly think it's worth bringing this patch into that HWE
> stack.
> 
> My reasoning is that it will ensure that if someone picks up a newer GPU
> such as Ryzen 7000 desktop or RDNA3 based they can at least
> install Ubuntu without needing to use "Safe Graphics Mode" at the installer.
> 
> Sure; they won't have hardware acceleration without the rest of the
> kernel and framework, but that's a separate problem to a basic display.
> 
> So would you please consider to take the patch linked above into 5.19
> with the time afforded by the HWE release delay?
> 

Thank you for letting us know about the issue!

I have backported the patch to our 5.19 kernel and we'll include it in
the next re-spin, which will be the build used for the 22.04.2 media.

https://lists.ubuntu.com/archives/kernel-team/2023-January/136441.html


Thanks!
Kleber