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Uyanide
2025-11-14 03:04:47 +01:00
parent 85a981e522
commit b3a57a8398
11 changed files with 9 additions and 68 deletions
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16
memo/sddm-blank.md
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@@ -1,14 +1,16 @@
## What
> kernel: `Linux 6.17.7-5-cachyos`
>
> nvidia-driver: `cachyos-v3/nvidia-open-dkms 580.105.08-3`
>
> sddm: `cachyos-v3/sddm 0.21.0-8`
SDDM shows a blank screen (only with mouse cursor and tty cursor) after booting into graphical target, but starts normally after restarting the SDDM service.
## Why
SDDM starts before the NVIDIA driver is fully initialized, causing the greeter to fail to display properly.
SDDM starts before the NVIDIA driver is fully initialized, causing the greeter session to fail to display properly.
<details>
<summary>evidence</summary>
@@ -16,7 +18,7 @@ SDDM starts before the NVIDIA driver is fully initialized, causing the greeter t
- Logs after booting (many unrelated lines omitted):
```log
...(maybe unrelated lines)...
...
systemd[1]: Started Simple Desktop Display Manager.
kernel: NVRM: testIfDsmSubFunctionEnabled: GPS ACPI DSM called before _acpiDsmSupportedFuncCacheInit subfunction = 11.
kernel: bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
@@ -68,7 +70,7 @@ systemd[1]: Started Session c1 of User sddm.
sddm-helper[1006]: Writing cookie to "/tmp/xauth_FfqCDd"
sddm-helper[1006]: Starting X11 session: "" "/usr/bin/sddm-greeter --socket /tmp/sddm-:0-HQDlHk --theme /usr/share/sddm/themes/sugar-candy"
sddm[878]: Greeter session started successfully
...(maybe unrelated lines)...
...
```
Although the greeter session started successfully, it is not able to display anything due to `nvidia 0000:01:00.0: [drm] Cannot find any crtc or sizes`, resulting in a blank screen.
@@ -76,7 +78,7 @@ Although the greeter session started successfully, it is not able to display any
- Logs after restarting sddm.service:
```log
...(maybe unrelated lines)...
...
systemd[1]: Started Simple Desktop Display Manager.
sudo[1123]: pam_unix(sudo:session): session closed for user root
sddm[1150]: Initializing...
@@ -105,18 +107,18 @@ systemd[1]: Started Session c2 of User sddm.
sddm-helper[1217]: Writing cookie to "/tmp/xauth_Qghqzs"
sddm-helper[1217]: Starting X11 session: "" "/usr/bin/sddm-greeter --socket /tmp/sddm-:0-YHEwdP --theme /usr/share/sddm/themes/sugar-candy"
sddm[1150]: Greeter session started successfully
...(maybe unrelated lines)...
...
```
</details>
## How
The key is to avoid the timing race between nvidia init and sddm start. There are multiple ways to achieve this, two for example:
The key is to avoid timing race between NVIDIA initialization and SDDM start. There are multiple ways to achieve this, two for example:
### Early KMS:
As described in [Hyprland WIKI](https://wiki.hypr.land/Nvidia/#early-kms-modeset-and-fbdev), this ensures that the NVIDIA driver is loaded in the initramfs and is ready before SDDM starts.
As described in [Hyprland WIKI](https://wiki.hypr.land/Nvidia/#early-kms-modeset-and-fbdev), this ensures that the NVIDIA driver is loaded in the initramfs and is ready before SDDM starts (just randomly forgot to do this after reinstalling the system :D).
1. enable `modset` in kernel parameters (e.g. in `/etc/default/grub`):