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Bug 5478

Summary: Vulkan KMS/DRM doesn’t work on Pi4
Product: SDL Reporter: bluestang2006
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: ASSIGNED --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 Keywords: target-2.0.16
Version: 2.0.15   
Hardware: ARM   
OS: Linux   

Description bluestang2006 2021-01-18 05:03:47 UTC 
Hello,

I’ve been following the recent Vulkan KMS/DRM implementation in SDL2 and have tried it countless times but I cannot get it to work on my Raspberry Pi4 with the latest 5.10 kernel, libdrm library and OpenGL/Vulkan drivers built from MESA.

I can use other Vulkan apps that do not use SDL2, i.e. RetroArch in KMS/DRM without any problems because the windowing system is not using SDL2.

I’ve been primarily using vkQuake3 to test the SDL2/Vulkan/KMS backend to no avail. The display I’m using is an LG LED TV because I don’t have a PC monitor at the moment.

I have contacted Manuel but he could not help me figure this out.

I’m not sure if there has been others testing the new backend but I’d figure I’d post a bug to get some assistance.
Comment 1 bluestang2006 2021-02-06 18:10:58 UTC 
Update:

Here is gdb backtrace on the segfault I am getting:

Program received signal SIGSEGV, Segmentation fault.
0x0000007fedfc1f28 in vkGetPhysicalDeviceDisplayPropertiesKHR () from /usr/lib/aarch64-linux-gnu/libvulkan.so.1
(gdb) 
(gdb) bt full
#0  0x0000007fedfc1f28 in vkGetPhysicalDeviceDisplayPropertiesKHR () from /usr/lib/aarch64-linux-gnu/libvulkan.so.1
No symbol table info available.
#1  0x0000007ff7f1fed4 in ?? () from /usr/lib/aarch64-linux-gnu/libSDL2-2.0.so.0
No symbol table info available.
#2  0x0000007fee12b3c0 in vk_createSurfaceImpl () at code/renderer_vulkan/vk_create_window_SDL.c:353
No locals.
#3  0x0000007fee0fbef4 in vk_getProcAddress () at code/renderer_vulkan/vk_instance.c:747
No locals.
#4  0x0000007fee0fd8c0 in vk_initialize () at code/renderer_vulkan/vk_init.c:21
        width = 127
        height = -301132196
#5  0x0000007fee0d166c in R_Init () at code/renderer_vulkan/tr_init.c:124
        i = 1024
#6  0x0000007fee0d1844 in RE_BeginRegistration (pGlCfg=0x5555e29218 <cls+966856>) at code/renderer_vulkan/tr_init.c:201
No locals.
#7  0x0000005555577e18 in CL_InitRenderer () at code/client/cl_main.c:3125
No locals.
#8  0x0000005555577f50 in CL_StartHunkUsers (rendererOnly=qfalse) at code/client/cl_main.c:3154
No locals.
#9  0x00000055555a0b0c in Com_Init (commandLine=0x7fffffefc8 "") at code/qcommon/common.c:2814
        s = 0x5555cfb0f0 <string> "09"
        qport = -2088452435
#10 0x000000555564849c in main (argc=1, argv=0x7ffffff518) at code/sys/sys_main.c:756
        i = 1
        commandLine = '\000' <repeats 1023 times>
        ver = {major = 2 '\002', minor = 0 '\000', patch = 15 '\017'}
Comment 2 Manuel Alfayate Corchete 2021-02-06 19:30:09 UTC 
@bluestang:

I don't know what could be going on here. VKQuake3 is working very well here with KMSDRM, using it's Vulkan renderer.

@Sam et all: Any ideas?
Comment 3 Sam Lantinga 2021-02-07 07:48:28 UTC 
Ryan, can you reproduce this and see what's happening here?