Only partial success w/ Kaby Lake iGPU & Nvidia 1650

Firbolgar · 08-18-2019, 01:00 PM

Hello,

I'm running Debian 10 and I'm trying to get the Kaby Lake iGPU working concurrently with my Nvidia 1650 card for a triple display setup (2 on Nivida and 1 on iGPU). I beleive I have everything working in terms of the drivers and kernel level issues but it looks like 1) lshw doesn't recognize the iGPU as a VGA compatabile controller which in turn causes 2) the i915 driver isn't being loaded by X11. Can someone please point me in the right direction to I can continue troubleshooting the issue?

Code:

$ sudo inxi -G
Graphics:  Device-1: Intel UHD Graphics 630 driver: i915 v: kernel 
           Device-2: NVIDIA TU117 [GeForce GTX 1650] driver: nvidia v: 418.88 
           Display: server: X.Org 1.20.4 driver: modesetting,nvidia unloaded: fbdev,nouveau,vesa resolution: 2560x1440~60Hz 
           OpenGL: renderer: GeForce GTX 1650/PCIe/SSE2 v: 4.6.0 NVIDIA 418.88

Code:

$ sudo lshw -C display
  *-display                 
       description: VGA compatible controller
       product: TU117 [GeForce GTX 1650]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:136 memory:dc000000-dcffffff memory:b0000000-bfffffff memory:c0000000-c1ffffff ioport:e000(size=128) memory:c0000-dffff
  *-display
       description: Display controller
       product: UHD Graphics 630 (Desktop)
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm bus_master cap_list
       configuration: driver=i915 latency=0
       resources: irq:126 memory:db000000-dbffffff memory:a0000000-afffffff ioport:f000(size=64)

^^^ Notice how the capbilities for the UHD 630 doesn't have vga_controller. Gut feeling is that's a part of the issue here but I don't know where to go from here

Code:

$ xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x201 cap: 0x1, Source Output crtcs: 4 outputs: 4 associated providers: 0 name:NVIDIA-0
Provider 1: id: 0x48 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 6 associated providers: 0 name:modesetting

mrmazda · 08-19-2019, 08:49 PM

Not every PC BIOS supports use of IGP when a PCIe graphics card is installed. My Kaby Lakes (1 Asus, 1 Gigabyte) run three displays off their IGPs. I can't recall having tried using either's IGP along with any PCIe graphics card. My much older Biostar motherboard with Eaglelake IGP clearly does not allow both to be used simultaneously. Your motherboard manual might report whether such support is present. You might have a BIOS option that needs to be set.

What's on your kernel cmdline? Some NVidia drivers require KMS be disabled. The Intel kernel driver i915 requires KMS be enabled, which is the kernel's default.

mrmazda · 08-19-2019, 09:04 PM

Quote:

Originally Posted by Firbolgar

the i915 driver isn't being loaded by X11.

The i915 is a kernel driver. The kernel decides whether to load it unless you block it.

X uses either the modesetting DDX or the Intel DDX for all non-antique Intel GPUs. The Intel DDX has been on life support for over 4 years, no new release in that period. The modesetting is newer technology, and the upstream default for Intel, and NVidia, and AMD GPUs. The modesetting DDX will normally not be used if the Intel is available (xserver-xorg-video-intel in Debian; xf86-video-intel upstream), unless its use is expressly configured. The same priority applies with the nouveau DDX for NVidia GPUs. I only use modesetting with any GPU it supports.