### System details

Omarchy 3.2.2, Canon MF210 Series

### What's wrong?

Environment:

┌──────────────────────Hardware──────────────────────┐
│ ├: AMD Ryzen 7 2700 (16) @ 3.20 GHz
│ ├: AMD Radeon RX 580 Series [Discrete]
│ ├󱄄: 3840x2160 @ 1.6x in 32", 60 Hz [External]
│ ├󰋊: 593.26 GiB / 929.50 GiB (64%) - btrfs
│ ├: 3.24 GiB / 31.26 GiB (10%)
└ └󰓡 : 0 B / 4.00 GiB (0%)
└──────────────────────────────────────────────────┘

┌──────────────────────Software──────────────────────┐
 OS: Omarchy 3.2.2
│ ├󰘬: master
│ ├󰔫: stable
│ ├: Linux 6.17.9-arch1-1
│ ├: Hyprland 0.52.1 (Wayland)
│ ├: ghostty 1.2.3-arch2
│ ├󰏖: 1048 (pacman)
│ ├󰸌: Matte Black ●●●●●●●●
└ └: Liberation Mono (9pt)
└────────────────────────────────────────────────────┘

┌────────────────Age / Uptime / Update───────────────┐
󱦟 OS Age: 7 days
󱫐 Uptime: 5 mins
 Update: Saturday, November 29 2025 at 16:36
└─────────────────────────────────────────────┘

Issue Description:
All GUI applications freeze indefinitely when attempting to print, despite CUPS functioning correctly via command line and direct CUPS operations working fine.
What Works:

✅ Command-line printing: lp -d Canon_MF210 /usr/share/cups/data/testprint prints successfully
✅ CUPS web interface (localhost:631) functions normally
✅ system-config-printer GUI opens and can print test pages successfully
✅ Printer is reachable on network (ping succeeds)
✅ CUPS service is running without errors

What Doesn't Work:

❌ Chromium: Print preview loads but clicking "Print" button shows "Printing..." indefinitely with no print job created
❌ Document Viewer (Evince): Freezes completely when print dialog is opened, requires force termination
❌ Zathura: Freezes when executing print command
❌ All GUI applications exhibit the same freeze behavior when attempting to print

Setup Steps Taken:

Initial CUPS installation:

bash   sudo pacman -S cups cups-pdf avahi
   sudo systemctl enable --now cups
   sudo systemctl enable --now avahi-daemon
```

2. **Driver installation:**
   - Installed `cndrvcups-lb` from AUR (Canon UFR II LT driver)
   
3. **Printer configuration attempts:**
   - First attempt: Added printer via CUPS web interface using "Canon MF210 Series - IPP Everywhere" (driverless)
   - Second attempt: Removed printers, re-added using Canon-specific driver `CNRCUPSMF210ZK.ppd` (Canon MF210 Series UFR II LT)
   - Third attempt: Changed from network discovery (`dnssd://`) to direct socket connection (`socket://redacted)

4. **Troubleshooting steps performed:**
   - Added user to `lp` group: `sudo usermod -aG lp redacted`
   - Disabled cups-browsed: `sudo systemctl stop cups-browsed && sudo systemctl disable cups-browsed`
   - Installed GTK print backends: `sudo pacman -S gtk3-print-backends`
   - Installed alternative portal: `sudo pacman -S xdg-desktop-portal-gtk`
   - Set default printer: `lpoptions -d Canon_MF210`
   - Attempted GTK print backend configuration in `~/.config/gtk-3.0/settings.ini`
   - Attempted environment variables in `~/.config/environment.d/gtk-print.conf`:
```
     GTK_PRINT_BACKEND=cups
     GTK_USE_PORTAL=0
```
   - Multiple reboots after each configuration change

**Technical Details:**

When using `strace` on a frozen Evince process, it shows an infinite loop:
```
poll([{fd=23, events=POLLIN}], 1, 0) = 1 ([{fd=23, revents=POLLIN}])
The process is stuck waiting for data on a file descriptor that never arrives.
CUPS Status:
bashlpstat -t
Output shows:

Scheduler running
Printer idle and accepting requests
No stuck print jobs
Device URI: socket://redacted

System Logs:
No errors appear in sudo journalctl -u cups when attempting to print from GUI applications.
Current Workaround:
Using command-line printing works perfectly:
bashlp filename.pdf

Suspected Root Cause:
This appears to be a GTK/Qt print dialog communication issue specific to Hyprland/Wayland environments. The print dialog attempts to query printer capabilities or communicate with CUPS but hangs indefinitely, while direct CUPS operations (via command line or system-config-printer's internal methods) work without issue.

Additional Context:

Chromium verbose logging showed the print process stops at "Updating print settings via service for Canon_MF210"
Multiple evince processes spawn during print attempts and die/restart
The Ctrl+Shift+P system print dialog in Chromium also causes a complete freeze requiring process termination
File descriptor 23 in frozen processes shows various states (wayland cursor, sockets) but never resolves