Arch Linux

lesenk

Member

Registered: 2025-06-04

Posts: 1

[Asus ProArt Studio] Black screen on sddm start after system upgrade

Hello everyone,

I am requesting some help on an issue I'm experiencing on my Asus ProArt StudioBook W5600Q laptop. I haven't used it for like a month and a few days ago I booted it to run a `pacman -Syu`; there were quite a bit of packages to upgrade. After it completed, I rebooted and was faced with the issue I have now. Of course, the laptop was working fine before and the update is the only change I made.

When Arch boots, I'm prompted to enter the LUKS passphrase, after that I see the systemd terminal logs of all services being started. When it's sddm's turn though, the screen goes full back with just a white underscore cursor in the top left corner. I failed to start the KDE/Wayland session (autologin). The laptop is unusable at that point, I can't switch to other ttys, Ctrl+Alt+Del doesn't do anything, I'm forced to press the power button for a few seconds.

If I boot with the `nomodeset` kernel parameter, it works fine albeit slow. Suspecting a kernel regression, I tried installing and booting on the Linux LTS kernel (installed `linux-lts` and created a GRUB entry to boot it and load the LTS initramfs image), without success.

The laptop is equipped with an NVIDIA RTX A2000 GPU, and an AMD Cezanne integrated GPU. On Arch, I prefer to use the AMD GPU because of its better support, and I don't do gaming. So, no nvidia package whatsoever is installed on my machine, except `libvdpau`.

# lshw -C video
  *-display
       description: VGA compatible controller
       product: GA107GLM [RTX A2000 Mobile]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: /dev/fb0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller cap_list fb
       configuration: depth=32 latency=0 mode=3840x2400 visual=truecolor xres=3840 yres=2400
       resources: iomemory:fe0-fdf iomemory:ff0-fef memory:fb000000-fbffffff memory:fe00000000-feffffffff memory:ff00000000-ff01ffffff ioport:e000(size=128) memory:fc000000-fc07ffff
  *-display
       description: VGA compatible controller
       product: Cezanne [Radeon Vega Series / Radeon Vega Mobile Series]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:06:00.0
       logical name: /dev/fb0
       version: c5
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi msix vga_controller bus_master cap_list fb
       configuration: depth=32 latency=0 resolution=3840,2400
       resources: iomemory:ff0-fef iomemory:ff0-fef memory:ff10000000-ff1fffffff memory:ff20000000-ff201fffff ioport:c000(size=256) memory:fc500000-fc57ffff

I realized that the `nouveau` kernel module was loaded, so I blacklisted it, but it changed nothing. Nouveau is still loaded despite being blacklisted; here is an extract from journald:

Jun 04 14:16:00 kernel: pci 0000:01:00.0: optimus capabilities: enabled, status dynamic power, hda bios codec supported
Jun 04 14:16:00 kernel: VGA switcheroo: detected Optimus DSM method \_SB_.PCI0.GPP0.PEGP handle
Jun 04 14:16:00 kernel: nouveau: detected PR support, will not use DSM
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: enabling device (0000 -> 0003)
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: NVIDIA GA107 (b77000a1)
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: bios: version 94.07.3b.40.e9
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: drm: VRAM: 4096 MiB
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: drm: GART: 536870912 MiB
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: drm: MM: using COPY for buffer copies
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: [drm] Registered 4 planes with drm panic
Jun 04 14:16:00 kernel: [drm] Initialized nouveau 1.4.0 for 0000:01:00.0 on minor 0
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: [drm] Cannot find any crtc or sizes
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: [drm] Cannot find any crtc or sizes
Jun 04 14:16:00 kernel: nouveau 0000:01:00.0: [drm] Cannot find any crtc or sizes

I suspect nouveau might be creating conflicts. Even though it's not clear why it was working before that update.

The complete log of the boot experiencing the issue (without `nomodeset` and with nouveau supposedly blacklisted) is available at: https://pastebin.com/JA1qAw2T

Any help to troubleshoot this issue will be appreciated.

Thank you!

Last edited by lesenk (2025-06-04 12:50:25)