This bug was fixed in the package linux - 6.1.0-16.16
---------------
linux (6.1.0-16.16) lunar; urgency=medium
* lunar/linux: 6.1.0-16.16 -proposed tracker (LP: #2008480)
* Packaging resync (LP: #1786013)
- debian/dkms-versions -- temporarily drop broken dkms
-- Andrea Righi <andrea.ri...@canonical.com> Fri, 24 Feb 2023 14:24:48
+0100
** Changed in: linux (Ubuntu Lunar)
Status: Fix Committed => Fix Released
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Packages, which is subscribed to linux-oem-6.1 in Ubuntu.
https://bugs.launchpad.net/bugs/2003524
Title:
amdgpu: framebuffer is destroyed and the screen freezes with
unsupported IP blocks
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
Fix Released
Status in linux source package in Kinetic:
Fix Released
Status in linux-oem-6.1 source package in Kinetic:
Invalid
Status in linux source package in Lunar:
Fix Released
Status in linux-oem-6.1 source package in Lunar:
Invalid
Bug description:
[Impact]
From "Mario Limonciello mario.limonciello at amd.com"
https://lists.ubuntu.com/archives/kernel-team/2023-January/136434.html.
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
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.
[Fix]
Cherry-pick/backport commit 1923bc5a56daeeabd7e9093bad2febcd6af2416a
"drm/amd: Delay removal of the firmware framebuffer" to Ubuntu Kinetic 5.19
kernel.
[Test case]
Boot kernel in a system with one of the amdgpu affected adapters.
[Where problems can occur]
The aforementioned commit could introduce other regressions on the support
for AMD GPUs.
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