Public bug reported: [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. ** Affects: linux (Ubuntu) Importance: Undecided Status: In Progress ** Affects: linux (Ubuntu Kinetic) Importance: Undecided Status: In Progress ** Affects: linux (Ubuntu Lunar) Importance: Undecided Status: In Progress ** Also affects: linux (Ubuntu Kinetic) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Lunar) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Kinetic) Status: New => In Progress ** Changed in: linux (Ubuntu Lunar) Status: New => In Progress -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux 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: In Progress Status in linux source package in Kinetic: In Progress Status in linux source package in Lunar: In Progress 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2003524/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
