Ubuntu從9.10升級到10.04後，發現開機後屏幕上出現全屏的閃爍短條紋。
經過一番折騰，發現是KMS的問題，Ubuntu10.04在內核2.6.32上默認開啟KMS，於是就有了這個問題，開機選擇2.6.31後就一切正常。
經過搜索，ubuntuwiki有介紹。（附在文後）
關閉KMS後一切正常，而且我的顯卡是：
ninehills@localhost:~$ lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV515 [Radeon Mobility X1450] [1002:7186]
屬於推薦不開啟的范疇
附錄：
X/KernelModeSetting
Kernel mode-setting (KMS) shifts responsibility for selecting and setting up the graphics mode from X.org to the kernel. When X.org is started, it then detects and uses the mode without any further mode changes. This promises to make booting faster, more graphical, and less flickery.
Configuring KMS on Lucid
By default, KMS is enabled by default for the -intel, -ati, and -nouveau drivers. It is not available for any other drivers at this time.
If you need to turn KMS *off* (I personally had to do it for Radeon Mobility X1400 and X1600), set modeset=0 for your kernel driver:
# ATI Radeon:echo options radeon modeset=0 > /etc/modprobe.d/radeon-kms.conf# Intel: (Note - see below)echo options i915 modeset=0 > /etc/modprobe.d/i915-kms.conf
The Nouveau video driver does not support non-KMS mode, instead you will need to install and use the xserver-xorg-video-nv driver.
The Intel video X driver as of version 2.9.1-1ubuntu4 has been compiled as KMS-only; if you need to turn off KMS on -intel, you must use an earlier version than this. Such a version is available from the x-retro PPA.
