From 750f295c0f692d212787eed8f40bd8b2412048e0 Mon Sep 17 00:00:00 2001
From: Zhang Dian <54255897+zdpcdt@users.noreply.github.com>
Date: Sat, 4 Nov 2023 01:16:36 +0800
Subject: [PATCH] feat: update usage doc.

---
 demo/Semi.Avalonia.Demo.Drm/使用方法.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/demo/Semi.Avalonia.Demo.Drm/使用方法.md b/demo/Semi.Avalonia.Demo.Drm/使用方法.md
index 0ae6395..870b6a2 100644
--- a/demo/Semi.Avalonia.Demo.Drm/使用方法.md
+++ b/demo/Semi.Avalonia.Demo.Drm/使用方法.md
@@ -54,3 +54,24 @@ sudo kmscube
 
 解决方法：  
 >sudo chmod +x ./Semi.Avalonia.Demo.Drm
+
+4. 报错内容
+>Unhandled exception. System.ComponentModel.Win32Exception (95): drmModeGetResources failed
+at Avalonia.LinuxFramebuffer.Output.DrmResources..ctor(Int32 fd, Boolean connectorsForceProbe) in /_/src/Linux/Avalonia.LinuxFramebuffer/Output/DrmBindings.cs:line 91
+at Avalonia.LinuxFramebuffer.Output.DrmCard.GetResources(Boolean connectorsForceProbe) in /_/src/Linux/Avalonia.LinuxFramebuffer/Output/DrmBindings.cs:line 171
+at Avalonia.LinuxFramebuffer.Output.DrmOutput..ctor(String path, Boolean connectorsForceProbe, DrmOutputOptions options) in /_/src/Linux/Avalonia.LinuxFramebuffer/Output/DrmOutput.cs:line 60
+at LinuxFramebufferPlatformExtensions.StartLinuxDrm(AppBuilder builder, String[] args, String card, Double scaling, IInputBackend inputBackend) in /_/src/Linux/Avalonia.LinuxFramebuffer/LinuxFramebufferPlatform.cs:line 166
+at Semi.Avalonia.Demo.Drm.Program.Main(String[] args)
+
+解决方法：
+>`program.cs`的显卡路径错误，可能不是`dev/dri/card1`，看在`dev/dri`目录下有无其他的显卡如`card0`。
+
+5. 报错内容
+>Unhandled exception. System.ComponentModel.Win32Exception (2): Couldn't open /dev/dri/card1
+at Avalonia.LinuxFramebuffer.Output.DrmCard..ctor(String ) in /_/src/Linux/Avalonia.LinuxFramebuffer/Output/DrmBindings.cs:line 167
+at Avalonia.LinuxFramebuffer.Output.DrmOutput..ctor(String , Boolean , DrmOutputOptions ) in /_/src/Linux/Avalonia.LinuxFramebuffer/Output/DrmOutput.cs:line 58
+at LinuxFramebufferPlatformExtensions.StartLinuxDrm(AppBuilder, String[], String , Double , IInputBackend ) in /_/src/Linux/Avalonia.LinuxFramebuffer/LinuxFramebufferPlatform.cs:line 166
+at Semi.Avalonia.Demo.Drm.Program.Main(String[])
+
+解决办法：
+>找不到显卡路径`dev/dri/card1`，可能是显卡挂载到别的文件夹下了，待解决。
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