升级到CentOS 6.4后，ATI显卡带来的麻烦

这个问题困扰了我好多天，一直在纠结这个。。。。换了好多方式，安装了显卡驱动，结果都很悲剧。今天看到这个帖子，终于解决了，心情大爽。。。。转载为有同样困扰的同学们。

完美的分界线
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没多想就执行了一个yum update。 kernel升级了，系统版本号也升级到了6.4。
重启后发现不能进入系统，卡在starting atd...
alt-f2进入命令行模式，重新安装ati显卡，失败。

最后在CentOS的release notes上看到：

The proprietary drivers for older AMD ( former ATI ) video cards, namely the 2xxx, 3xxx and 4xxx series ( both integrated in motherboards or standalone cards) are not compatible with the new version of the X server introduced in CentOS-6.4. As of mid-March 2013 the only known workaround allowing the use of the proprietary drivers is to downgrade the X server ( xorg* packages ) to the versions available in CentOS 6.3. More details about the extensive investigation around this issue is available here. Make sure that you do not allow yum to upgrade again the packages that have been downgraded by adding the following to the end of /etc/yum.conf exclude=xorg* Note that use of proprietary drivers was never needed for CentOS-6 if all you wanted was a dual-monitor setup. See this FAQ entry for more details on using a dual-monitor setup.

原来CentOS 6.4版本开始不支持ATI的2xxx，3xxx，4xxx系列的显卡。

但是已经升级到6.4怎么办呢。 只需要把xorg的版本降回6.3版系统时的版本就行。测试成功。
操作步骤如下：

# yum remove xorg-x11-drv-modesetting
- this was a new pkg in 6.4 so it can't be downgraded. causes downgrade command to fail if it's still installed.
# yum --disablerepo=\* --enablerepo=C6.3\* downgrade xorg\*
- corrects a small typo in TrevorH post
# yum --disablerepo=\* --enablerepo=C6.3\* install xorg-x11-drivers
- reinstalls the correct version of a pkg removed along with the modesetting thing as a dependency

Sorted.

以上内容引用自：

最后别忘在/etc/yum.conf中加入 exclude=xorg*，以免下此系统升级时xorg版本又被升上来。

出处：