我正在使用 Ubuntu 14.04 LTS，尝试配置并排显示器
系统设置>显示：我将第二台显示器移至右侧
无法应用所选的显示器配置
请求的大小 (2880, 1024) 超出了 3D 硬件限制 (2048, 2048)。您必须重新排列显示器，使其适合 (2048, 2048) 正方形。
（下面可以工作，但我想将其修复到并排。PS：此硬件在 Windows 7 中可以工作）
lspci | grep VGA：（这是在告诉我我正在使用“正确的” Radeon 驱动程序吗？（我确实有一张 Radeon X600 显卡））
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV370 [Radeon X600/X600 SE]
xrandr:(这是说我最多可以使用 4096x4096 吗？）
Screen 0: minimum 320 x 200, current 1600 x 1924, maximum 4096 x 4096
DVI-0 connected primary 1280x1024+320+900 (normal left inverted right x axis y axis) 338mm x 270mm
1280x1024 60.0*+ 75.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
DVI-1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 432mm x 240mm
1600x900 60.0*+
1280x1024 75.0 60.0
1280x720 60.0
1024x768 75.1 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 66.7 60.0
720x400 70.1
之前，Fabby 询问了我的 GPU 内存，这是需要的信息吗？
lspci -vnn | grep VGA -A 12
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV370 [Radeon X600/X600 SE] [1002:5b62] (prog-if 00 [VGA controller])
Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:0b02]
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Memory at fe9e0000 (64-bit, non-prefetchable) [size=64K]
I/O ports at dc00 [size=256]
Expansion ROM at fea00000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
01:00.1 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] RV380 [Radeon X300/X550/X1050 Series] (Secondary) [1002:5b72]
Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:0b03]
Flags: bus master, fast devsel, latency 0