大神求助，进不了桌面了黑屏无显示

[1282841885]

各位大神，我的平板使用 framebuffer屏幕黑了，按键无反应。怎么办？
(??) unknown.
[ 4085.718] (EE) FBDEV(0): FBIOPUT_VSCREENINFO: Invalid argument
[ 4085.718] (EE) FBDEV(0): mode initialization failed
[ 4085.718] (EE)
[ 4085.718] (EE) AddScreen/ScreenInit failed for driver 0
[ 4085.718] (EE)
[ 4085.718] (EE)
[ 4085.718] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 4085.718] (EE)
[ 4085.730] (EE) Server terminated with error (1). Closing log file.
root @localhost:~#

[careone]

1. 把电脑品牌型号，硬件配置，Ubuntu 版本贴出来；

２．把日志文件　/var/log/Xorg.0.log　的内容贴出来，方便判断分析．要文字，图片地不要．

3.　最近是否有什么可疑操作？如：升级系统？安装或者删除软件？修改了某个系统配置文件？