You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
{{ message }}
Repository navigation
Refactor: Improve UEFI GOP Mode Selection Logic and Configuration #534
In the current implementation within uefi/src/main.rs -> init_logger, the GOP (Graphics Output Protocol) mode selection relies on a simple filter-and-last strategy:
modes.filter(|m| resolution_meets_minimum).last()
This approach leads to inconsistent experiences across different environments:
Default/Fallback Issue: When no minimum requirements are set, QEMU defaults to a reasonable 1280x800, but my real hardware often falls back to a legacy 800x600 (SVGA), which is insufficient for modern logging.
"Last Fit" Bias: When minimum requirements are specified (e.g., 1080p), the code picks the last mode in the list. On high-end displays, this often results in the maximum supported resolution (e.g., 2560x1600 or 3840x2160), which might not be the intended "best" resolution for a bootloader or kernel log.
Proposed Improvement
I suggest introducing a more robust selection mechanism that supports Preferred Resolutions and Aspect Ratio Filtering.
Predefined Presets: Instead of raw pixel values, allow users to specify common targets like 720p, 1080p, or 2K.
Aspect Ratio Awareness: Support filtering by ratios such as 16:9, 16:10, or 4:3.
Optimal Selection Strategy:Find the Closest Match to a target resolution.If no exact match exists, fallback to the highest resolution within a specific aspect ratio.Implement a "Best Fit" instead of "Last Fit" (e.g., preference for (1920\times 1080) over (2560\times 1600) if the user targets FHD).
Add Maximum Constraint: With only minimum constraints, sometimes it will lead to maximum values. Add maximum constraint to avoid that.
EDID: I'm not familiar with UEFI EDID. I know this just form some simple lookup. this might be helpful.
Summary
I think adding maximum constraints and using min_by_keyabs_diff or thing else to replace last strategy are easy to implement and solve this problem.
Activity