readme split

x11.md

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+# X11
+
+Only tested successfully in `x86_64`:
+
+    startx
+
+![](x11.png)
+
+More details: <https://unix.stackexchange.com/questions/70931/how-to-install-x11-on-my-own-linux-buildroot-system/306116#306116>
+
+Not sure how well that graphics stack represents real systems, but if it does it would be a good way to understand how it works.
+
+## X11 ARM
+
+On ARM, `startx` hangs at a message:
+
+    vgaarb: this pci device is not a vga device
+
+and nothing shows on the screen, and:
+
+    grep EE /var/log/Xorg.0.log
+
+says:
+
+    (EE) Failed to load module "modesetting" (module does not exist, 0)
+
+A friend told me this but I haven't tried it yet:
+
+- `xf86-video-modesetting` is likely the missing ingredient, but it does not seem possible to activate it from Buildroot currently without patching things.
+- `xf86-video-fbdev` should work as well, but we need to make sure fbdev is enabled, and maybe add some line to the `Xorg.conf`