我犯了一个致命的错误，将系统升级到 Ubuntu 11.04。这个东西太破了，我花了好几个星期才让它启动。现在的问题是，过了一段时间（5-72 小时），屏幕就变得乱七八糟，窗口开始随机移动到不同的工作区。
这对我来说是个大问题，因为我有 6 个工作区和 3 个显示器。有人知道为什么会发生这种情况以及如何防止这种情况发生吗？
系统规格（致电lspci）
00:00.0 Host bridge: ATI Technologies Inc RX780/RX790 Chipset Host Bridge
00:02.0 PCI bridge: ATI Technologies Inc RD790 PCI to PCI bridge (external gfx0 port A)
00:09.0 PCI bridge: ATI Technologies Inc RD790 PCI to PCI bridge (PCI express gpp port E)
00:0a.0 PCI bridge: ATI Technologies Inc RD790 PCI to PCI bridge (PCI express gpp port F)
00:11.0 SATA controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 SATA Controller [IDE mode] (rev 40)
00:12.0 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.2 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.2 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 42)
00:14.1 IDE interface: ATI Technologies Inc SB7x0/SB8x0/SB9x0 IDE Controller (rev 40)
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA) (rev 40)
00:14.3 ISA bridge: ATI Technologies Inc SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge (rev 40)
00:14.5 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
00:15.0 PCI bridge: ATI Technologies Inc Device 43a0
00:16.0 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:16.2 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor HyperTransport Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Miscellaneous Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Link Control
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
03:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03)
04:00.0 IDE interface: JMicron Technology Corp. JMB368 IDE controller
05:00.0 VGA compatible controller: ATI Technologies Inc Cayman PRO [AMD Radeon 6900 Series]
05:00.1 Audio device: ATI Technologies Inc Device aa80
我在 Ubuntu 11.04