Created attachment 285907 [details] journalctl output I'm getting a black screen on boot when testing the 5.4 release candidate kernels on a Dell Inspiron 7375 laptop. The system responds to the magic sysrq, so the kernel is not completely dead, but the display is. The system boots correctly with a 5.3.1 kernel. The log showing the stack trace is attached. I'll start working on bisecting the problem soon.
1c4259159132ae4ceaf7c6db37a6cf76417f73d9 is the first bad commit commit 1c4259159132ae4ceaf7c6db37a6cf76417f73d9 Author: Shirish S <shirish.s@amd.com> Date: Tue Jul 16 14:49:48 2019 +0530 drm/amd/display: enable S/G for RAVEN chip enables gpu_vm_support in dm and adds AMDGPU_GEM_DOMAIN_GTT as supported domain v2: Move BO placement logic into amdgpu_display_supported_domains v3: Use amdgpu_bo_validate_uswc in amdgpu_display_supported_domains. v4: amdgpu_bo_validate_uswc moved to sepperate patch. Signed-off-by: Shirish S <shirish.s@amd.com> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com> Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 2 +- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
Does disabling the IOMMU help? Set iommu=off or iommu=pt on the kernel command line.
"iommu=off" seems to work, "iommu=pt" does not.
(In reply to Alex Deucher from comment #2) > Does disabling the IOMMU help? Set iommu=off or iommu=pt on the kernel > command line. Is this permanent too ? This will regress and produce tearing in games running with PRIME setup.