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Refactor: Improve UEFI GOP Mode Selection Logic and Configuration

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评估

难度
5/5
预计耗时
一周以上
新手友好度
30/100
Issue 类型
重构
描述清晰度
需要澄清
活跃度
停滞
技术栈
rust
领域
computer-graphics, operating-systems

调研方向

从 uefi/src/main.rs 的 init_logger 开始，跟踪当前的 GOP 模式筛选和配置输入。在更改选择策略之前，明确所需的预设、宽高比、最小值、最大值和 EDID 行为；完成标准应包括已达成一致的最佳匹配行为，以及对指定回退情况的覆盖。

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描述

Current Behavior

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:

  1. 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.
  2. "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. 

  1. Predefined Presets: Instead of raw pixel values, allow users to specify common targets like 720p, 1080p, or 2K.
  2. Aspect Ratio Awareness: Support filtering by ratios such as 16:9, 16:10, or 4:3.
  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).
  4. Add Maximum Constraint: With only minimum constraints, sometimes it will lead to maximum values. Add maximum constraint to avoid that.
  5. 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_key abs_diff or thing else to replace last strategy are easy to implement and solve this problem.

Suggested Labels: enhancement, area/uefi

主要语言
Rust
星标
1.7k
派生
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