我的笔记本是DELL vostro1450，双显卡信息如下：
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] (rev ff)
在安装好 intel 与 ati 显卡驱动后，并且安装了xorg 和 xfce
启动时： startxfce4
笔记本黑屏，只能关机重启。
Xorg.0.log 文件中的 EE 错误信息如下：
[ 259.099] Current Operating System: Linux wangbin-archlinux 3.19.2-1-ARCH #1 SMP PREEMPT Wed Mar 18 16:36:01 CET 2015 i686
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 259.314] (EE) intel(0): failed to set mode: Permission denied
[ 259.314] (EE)
[ 259.314] (EE) AddScreen/ScreenInit failed for driver 0
[ 259.314] (EE)
[ 259.314] (EE)
[ 259.314] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 259.315] (EE)
有哪位高人能解答一下吗？不胜感谢。
最近编辑记录 bill-wang (2015-03-25 23:06:41)
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https://www.archlinux.org/news/xorg-ser … available/
X is now rootless with the help of systemd-logind, this also means that it must be launched from the same virtual terminal as was used to log in, redirecting stderr also breaks rootless login. The old root execution behavior can be restored through the Xorg.wrap config file (man xorg.wrap). Please note that launching X through a login-manager (gdm, kdm, ...) doesn't yet provide rootless access.
不要用 root 启动 X. 在第一个登录的 TTY 启动 X.
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谢谢 @fengchao
按你所说的方向且查找了一下wiki，我安装了 lxdm 显示管理器，然后编辑 /etc/lxdm/lxdm.conf
添加启动项：
session=/usr/bin/startxfce4
然后重启，结果成功进入xfce.
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