https://wiki.riguz.com/index.php?action=history&feed=atom&title=HDMI_EDID 2026-07-25T22:25:48Z 本wiki上该页面的版本历史 MediaWiki 1.46.0 https://wiki.riguz.com/index.php?title=HDMI_EDID&diff=5201&oldid=prev 2026-07-24T14:38:31Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw-interface=""> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="zh-Hans-CN"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">←上一版本</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">2026年7月24日 (五) 14:38的版本</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">第1行：</td> <td colspan="2" class="diff-lineno">第1行：</td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">EDID（Extended Display Identification Data）是显示器内部存放的一段标准化二进制数据，相当于显示屏的"身份证+能力清单"——它告诉信号源自己的厂商、型号、支持的分辨率、刷新率、时序参数等。</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">在 Linux 下，EDID 的典型流程是这样的：</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"># 读取：内核显示驱动通过 HDMI/DP 接口的 DDC 通道（本质是 I²C 总线）向显示器读取 128 或 256 字节的 EDID 数据。</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"># 解析：DRM（Direct Rendering Manager）子系统调用 drm_edid_read() 解析这段数据，提取出显示器支持的所有显示模式（即 Detailed Timing Descriptors 里的分辨率+刷新率组合）。</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"># 建表：解析出的模式被加入 drm_connector 的 modes 链表，形成该连接器的可用模式列表。</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"># 匹配：用户空间的显示服务（如 X11/Wayland compositor）从列表中挑选最合适的模式，通过 drmModeSetCrtc() 通知内核，让显示控制器按此时序输出信号。</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">如果在第 1 步 HDMI 控制器没能成功读到 EDID（如时序竞争、线材问题），内核就无法建立模式列表，于是出现黑屏——这正是你 Rock 5B+ 遇到的问题。解决办法要么强制指定 video= 参数绕过 EDID 协商，要么通过 drm.edid_firmware= 注入一份 EDID 文件，让内核直接使用这份"假"的但正确的能力描述。</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;syntaxhighlight lang=&quot;bash&quot;&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;syntaxhighlight lang=&quot;bash&quot;&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>❯ ioreg -lw0 | grep IODisplayEDID</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>❯ ioreg -lw0 | grep IODisplayEDID</div></td></tr> <!-- diff cache key wiki_db:diff:1.41:old-5200:rev-5201:php=table --> </table>

Riguz https://wiki.riguz.com/index.php?title=HDMI_EDID&diff=5200&oldid=prev 2026-07-24T14:04:39Z

<p>创建页面，内容为“&lt;syntaxhighlight lang=&quot;bash&quot;&gt; ❯ ioreg -lw0 | grep IODisplayEDID | | | | &quot;IODisplayEDID&quot; = &lt;00ffffffffffff0006102ea00000000004190104a5211578026fb1a7554c9e250c505400000001010101010101010101010101010101ef8340a0b0083470302036004bcf1000001a000000fc00436f6c6f72204c43440a20202000000010000000000000000000000000000000000010000000000000000000000000000000d0&gt; | | | | | &quot;IODisplayEDID&quot; = &lt;00ffffffffffff0012e50021502d31011c130103812f1a782e3585a6564…”</p> <p><b>新页面</b></p><div>&lt;syntaxhighlight lang=&quot;bash&quot;&gt;<br /> ❯ ioreg -lw0 | grep IODisplayEDID<br /> | | | | &quot;IODisplayEDID&quot; = &lt;00ffffffffffff0006102ea00000000004190104a5211578026fb1a7554c9e250c505400000001010101010101010101010101010101ef8340a0b0083470302036004bcf1000001a000000fc00436f6c6f72204c43440a20202000000010000000000000000000000000000000000010000000000000000000000000000000d0&gt;<br /> | | | | | &quot;IODisplayEDID&quot; = &lt;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&gt;<br /> &lt;/syntaxhighlight&gt;<br /> <br /> [[Category:Linux/Unix]]</div>

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