Created attachment 144053 [details] xorg log Hi, I'm using a Ryzen 3550H laptop with integrated Vega graphics and an additional Radeon 560. Whenever I boot the laptop with a screen connected to the HDMI port, the screen turns blank upon lxdm start and I can see these error messages in the Xorg log: [ 263.699] (II) AMDGPU(0): Setting screen physical size to 1524 x 571 [ 263.716] (EE) AMDGPU(0): failed to set mode: Cannot allocate memory [ 263.716] (WW) AMDGPU(0): Failed to set mode on CRTC 0 [ 263.817] (EE) AMDGPU(0): failed to set mode: Cannot allocate memory [ 263.817] (WW) AMDGPU(0): Failed to set mode on CRTC 1 [ 263.887] (EE) AMDGPU(0): Failed to enable any CRTC Kernel: is a self-built 5.0.9, but the same has happened with debian experimental 5.0.2, as well as the debian buster's 4.19. xserver-xorg-video-amdgpu: 19.0.1-1 If HDMI is not connected, everything is working.
I guess this could also be in dri->drm/amdgpu. I'm not sure how to narrow it down, I've tried with breakpoints for drmModeSetCrtc and drmmode_set_mode_major but I'm not seeing anything that sticks out.
Yeah, this is a kernel issue. There's only a small amount of VRAM available, so the 5760x2160 framebuffer can't fit, and the kernel driver doesn't support scanout from system memory with Raven Ridge yet. Meanwhile, if the amount of VRAM can be increased in the BIOS setup, try that.
(In reply to Michel Dänzer from comment #2) > Yeah, this is a kernel issue. There's only a small amount of VRAM available, > so the 5760x2160 framebuffer can't fit, and the kernel driver doesn't > support scanout from system memory with Raven Ridge yet. > > Meanwhile, if the amount of VRAM can be increased in the BIOS setup, try > that. Thank you very much for the explanation and workaround suggestion. My choices on this laptop are "128M" or "Auto". I think I have to poke Asus about this, but: With Auto I do get 2048 as per dmesg and it's working. So again, thank you. :)
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