我遇到过这种情况：Ubuntu 14.04 Desktop 在使用几个小时后速度急剧下降。我问了一个问题（这里) 上周我收到了我的鼠标指针图标自行变化的通知。过去几天我注意到，这种变化与 Ubuntu 的运行速度大幅下降同时发生 - 打字速度很慢，切换选项卡和窗口很慢且笨拙等等。
我安装了 16GB 的 RAM，使用时有很多可用空间，watch -n 5 free -m所以我不认为这是问题所在。
如果我重新启动系统，那么一切都会恢复正常，并且 Ubuntu 会在几个小时内运行良好，直到再次发生这种情况。
有谁知道是什么原因导致了这个问题？
我不确定这是否相关，但此安装是从另一台更高规格的机器恢复的克隆。这和它有什么关系吗？
编辑：我刚刚注意到，当我重新启动系统时，图形变得非常块状。这在过去几天也发生过，但我没有把 2+2 放在一起并将其与上述问题联系起来。为了解决本周早些时候的块状图形问题，我摆弄了 AMD Catalyst，当我重新启动系统时，图形正常。我使用的驱动程序是：fglrx-updates (proprietary)。有人知道这里发生了什么以及我该如何修复它吗？
这是我的规格（由于问题文字太多所以缩短了）：
description: Notebook
product: 80F0 (LENOVO_MT_80F0_BU_idea_FM_Lenovo B50-45)
vendor: LENOVO
version: Lenovo B50-45
serial: 3819047600004
width: 64 bits
*-cpu
description: CPU
product: AMD A6-6310 APU with AMD Radeon R4 Graphics
vendor: Advanced Micro Devices [AMD]
physical id: 4
bus info: cpu@0
version: AMD A6-6310 APU with AMD Radeon R4 Graphics
serial: NotSupport
slot: Socket FT3b
size: 1400MHz
capacity: 1800MHz
width: 64 bits
clock: 100MHz
*-memory
description: System Memory
size: 16GiB
*-bank:0
description: SODIMM DDR3 Synchronous 800 MHz (1.2 ns)
product: CT102464BF160B.C16
physical id: 0
serial: 1246F5A4
slot: DIMM 0
size: 8GiB
width: 64 bits
clock: 800MHz (1.2ns)
*-bank:1
description: SODIMM DDR3 Synchronous 800 MHz (1.2 ns)
product: CT102464BF160B.C16
physical id: 1
serial: 1246F5A3
slot: DIMM 1
size: 8GiB
width: 64 bits
clock: 800MHz (1.2ns)
*-display
description: VGA compatible controller
product: Mullins [Radeon R4/R5 Graphics]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 64 bits
clock: 33MHz
configuration: driver=fglrx_pci latency=0
*-scsi:0
physical id: 1
logical name: scsi0
capabilities: emulated
*-disk
description: ATA Disk
product: Samsung SSD 850
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/sda
version: EMT0
serial: S2MRNXAH315576B
size: 232GiB (250GB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=5 sectorsize=512 signature=6115241f
编辑：哎呀。今天到目前为止过得很好，但问题又出现了。以下是 /var/log/Xorg.0.log 的输出，有人可能能够解读：
[ 11.941] (WW) fglrx(0): Failed to get EDID by ACPI
[ 11.943] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 11.947] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 11.947] (II) fglrx(0): Using EDID range info for horizontal sync
[ 11.947] (II) fglrx(0): Using EDID range info for vertical refresh
[ 11.947] (II) fglrx(0): Printing DDC gathered Modelines:
[ 11.947] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 11.947] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 11.947] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 11.947] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 11.947] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 11.947] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 11.947] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 11.947] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 11.947] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 11.948] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 11.949] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 18.797] (WW) fglrx(0): Failed to get EDID by ACPI
[ 18.800] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 18.803] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 18.803] (II) fglrx(0): Using hsync ranges from config file
[ 18.803] (II) fglrx(0): Using vrefresh ranges from config file
[ 18.803] (II) fglrx(0): Printing DDC gathered Modelines:
[ 18.803] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 18.803] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 18.803] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 18.803] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 18.803] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 18.803] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 18.803] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 18.803] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 18.803] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 18.804] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 35.168] (II) XKB: reuse xkmfile /var/lib/xkb/server-DC6B80E1F93F4FDB91E75CD00B96157EEC008205.xkm
[ 36.124] (WW) fglrx(0): Failed to get EDID by ACPI
[ 36.125] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 36.129] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 36.129] (II) fglrx(0): Using hsync ranges from config file
[ 36.129] (II) fglrx(0): Using vrefresh ranges from config file
[ 36.129] (II) fglrx(0): Printing DDC gathered Modelines:
[ 36.129] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 36.129] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 36.129] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 36.129] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 36.129] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 36.129] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 36.129] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 36.129] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 36.129] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 36.130] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 36.902] (WW) fglrx(0): Failed to get EDID by ACPI
[ 36.904] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 36.908] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 36.908] (II) fglrx(0): Using hsync ranges from config file
[ 36.908] (II) fglrx(0): Using vrefresh ranges from config file
[ 36.908] (II) fglrx(0): Printing DDC gathered Modelines:
[ 36.908] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 36.908] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 36.908] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 36.908] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 36.908] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 36.908] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 36.908] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 36.908] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 36.908] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 36.908] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 36.908] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 36.908] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 36.909] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 36.909] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 36.909] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 36.909] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 36.909] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 36.910] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 37.336] (WW) fglrx(0): Failed to get EDID by ACPI
[ 37.337] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 37.341] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 37.341] (II) fglrx(0): Using hsync ranges from config file
[ 37.341] (II) fglrx(0): Using vrefresh ranges from config file
[ 37.341] (II) fglrx(0): Printing DDC gathered Modelines:
[ 37.341] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 37.341] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 37.341] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 37.341] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 37.341] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 37.341] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 37.341] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 37.341] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 37.341] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 37.342] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 37.508] (II) XKB: reuse xkmfile /var/lib/xkb/server-7C46A88197A2CF60980B264FE380C48E924DD339.xkm
[ 37.544] (II) XKB: reuse xkmfile /var/lib/xkb/server-7C46A88197A2CF60980B264FE380C48E924DD339.xkm
[ 38.360] (WW) fglrx(0): Failed to get EDID by ACPI
[ 38.361] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 38.366] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 38.366] (II) fglrx(0): Using hsync ranges from config file
[ 38.366] (II) fglrx(0): Using vrefresh ranges from config file
[ 38.366] (II) fglrx(0): Printing DDC gathered Modelines:
[ 38.366] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 38.366] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 38.366] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 38.366] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 38.366] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 38.366] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 38.366] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 38.366] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 38.366] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 38.366] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 38.367] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 38.367] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 38.367] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 38.367] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 38.367] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 38.367] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 38.367] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 38.368] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 38.673] (WW) fglrx(0): Failed to get EDID by ACPI
[ 38.675] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 38.678] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 38.679] (II) fglrx(0): Using hsync ranges from config file
[ 38.679] (II) fglrx(0): Using vrefresh ranges from config file
[ 38.679] (II) fglrx(0): Printing DDC gathered Modelines:
[ 38.679] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 38.679] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 38.679] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 38.679] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 38.679] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 38.679] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 38.679] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 38.679] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 38.679] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 38.680] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 41.240] (II) XKB: reuse xkmfile /var/lib/xkb/server-0DF9A6CCA6AEFB68925697A43C309A4377FEC7B2.xkm
[ 53.271] (WW) fglrx(0): Failed to get EDID by ACPI
[ 53.273] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 53.276] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 53.276] (II) fglrx(0): Using hsync ranges from config file
[ 53.276] (II) fglrx(0): Using vrefresh ranges from config file
[ 53.276] (II) fglrx(0): Printing DDC gathered Modelines:
[ 53.276] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 53.276] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 53.276] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 53.276] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 53.276] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 53.276] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 53.276] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 53.277] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 53.277] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 53.277] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
[ 53.280] (WW) fglrx(0): Failed to get EDID by ACPI
[ 53.282] (II) fglrx(0): User Preference Output DFP1 using refresh rate 60.0 Hz.
[ 53.285] (II) fglrx(0): EDID vendor "PHL", prod id 49352
[ 53.285] (II) fglrx(0): Using hsync ranges from config file
[ 53.285] (II) fglrx(0): Using vrefresh ranges from config file
[ 53.285] (II) fglrx(0): Printing DDC gathered Modelines:
[ 53.285] (II) fglrx(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 53.285] (II) fglrx(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 53.285] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484 500 -hsync -vsync (37.5 kHz e)
[ 53.285] (II) fglrx(0): Modeline "640x480"x0.0 31.50 640 664 704 832 480 489 492 520 -hsync -vsync (37.9 kHz e)
[ 53.285] (II) fglrx(0): Modeline "640x480"x0.0 30.24 640 704 768 864 480 483 486 525 -hsync -vsync (35.0 kHz e)
[ 53.285] (II) fglrx(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 53.285] (II) fglrx(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1280x1024"x0.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1024x768"x0.0 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync (60.0 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 53.285] (II) fglrx(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync (46.9 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1440x900"x0.0 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync (70.6 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 53.285] (II) fglrx(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 53.286] (II) fglrx(0): User Preference Output CRT1 using refresh rate 60.0 Hz.
感谢您的关注。希望有人能帮忙。我现在要重启系统。我猜重启后块状图形又会恢复。
编辑：确实如此。图形又变块了。这非常令人沮丧，因为在发生这种情况之前，性能一直很好。我要更换驱动程序，然后再改回来。
答案1
发布我如何解决这个问题，以防将来有人遇到类似的问题。
我在有问题的机器上重新安装了 Ubuntu 14.04，开源图形驱动程序立即识别了双显示器。我已经使用了 2 天，没有任何问题。
上述问题似乎是由 AMD 专有驱动程序缺陷导致的。自从我改用开源驱动程序后，就再也没有遇到过这些问题。
我猜开源驱动程序最初没有支持双显示器，因为我将另一台机器上制作的图像恢复到了这台机器上。全新安装解决了这个问题。
感谢大家的帮助