今晚我全新安装了Xubuntu 15.04在我的笔记本电脑 Acer Aspire TimelineX 4820TG 上。我之前运行的是 14.04 LTS，一切都很好。我没有太多东西要保存，所以我进行了完全卸载并重新安装，以便拥有一个更干净的系统。
不幸的是，自从第一次启动以来，我遇到了周期性的死机。每 6-10 秒发生一次冻结，持续约 1 秒。在冻结期间鼠标和键盘没有响应，因此整个系统看起来都一样。这很烦人。
此外，每次发生冻结时我都能听到风扇加速的声音。系统在关机时挂起（我不得不长按电源按钮）。
我注意到每一个冻结打印的这些精确行/var/log/kern.log：
[ 159.876643] snd_hda_intel 0000:01:00.1: Disabling via VGA-switcheroo
[ 160.097085] snd_hda_intel 0000:01:00.1: Cannot lock devices!
[ 160.844851] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 160.844866] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 160.844874] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 160.844884] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 160.844891] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 161.686549] [drm] PCIE GART of 1024M enabled (table at 0x000000000025E000).
[ 161.686692] radeon 0000:01:00.0: WB enabled
[ 161.686698] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff8800a7c78c00
[ 161.686702] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff8800a7c78c0c
[ 161.687450] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x000000000005c418 and cpu addr 0xffffc9001a21c418
[ 161.704183] [drm] ring test on 0 succeeded in 1 usecs
[ 161.704196] [drm] ring test on 3 succeeded in 2 usecs
[ 161.880223] [drm] ring test on 5 succeeded in 1 usecs
[ 161.880231] [drm] UVD initialized successfully.
[ 161.880275] [drm] ib test on ring 0 succeeded in 0 usecs
[ 161.880313] [drm] ib test on ring 3 succeeded in 0 usecs
[ 162.030450] [drm] ib test on ring 5 succeeded
[ 162.048802] snd_hda_intel 0000:01:00.1: Enabling via VGA-switcheroo
[ 162.063426] [drm] radeon: finishing device.
[ 162.072813] [TTM] Finalizing pool allocator
[ 162.072823] [TTM] Finalizing DMA pool allocator
[ 162.072976] [TTM] Zone kernel: Used memory at exit: 0 kiB
[ 162.072983] [drm] radeon: ttm finalized
[ 162.072991] vga_switcheroo: disabled
[ 162.073830] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=none,decodes=io+mem:owns=io+mem
[ 162.116658] pci_bus 0000:01: busn_res: [bus 01] is released
[ 162.144719] pci_bus 0000:04: Allocating resources
[ 162.144741] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.144749] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.144756] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.144763] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.144769] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.145274] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.145280] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.145285] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.145293] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.145300] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.145373] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.145378] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.145384] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.145392] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.145398] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.145466] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.145471] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.145476] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.145485] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.145491] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.145518] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.145523] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.145528] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.145536] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.145542] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.145731] pci_bus 0000:02: Allocating resources
[ 162.145772] pci_bus 0000:03: Allocating resources
[ 162.145789] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.145795] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.145800] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.145808] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.145813] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.146003] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.146007] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.146012] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.146018] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.146023] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.146175] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work.
[ 162.146196] pci 0000:00:01.0: [8086:0045] type 01 class 0x060400
[ 162.146242] pci 0000:00:01.0: PME# supported from D0 D3hot D3cold
[ 162.146501] pci 0000:01:00.0: [1002:68e0] type 00 class 0x030000
[ 162.146521] pci 0000:01:00.0: reg 0x10: [mem 0xe0000000-0xe7ffffff 64bit pref]
[ 162.146533] pci 0000:01:00.0: reg 0x18: [mem 0xdc400000-0xdc41ffff 64bit]
[ 162.146541] pci 0000:01:00.0: reg 0x20: [io 0x5000-0x50ff]
[ 162.146554] pci 0000:01:00.0: reg 0x30: [mem 0xfffe0000-0xffffffff pref]
[ 162.146593] pci 0000:01:00.0: supports D1 D2
[ 162.146665] vgaarb: device added: PCI:0000:01:00.0,decodes=io+mem,owns=none,locks=none
[ 162.146669] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=none:owns=io+mem
[ 162.146700] pci 0000:01:00.1: [1002:aa68] type 00 class 0x040300
[ 162.146718] pci 0000:01:00.1: reg 0x10: [mem 0xdc420000-0xdc423fff 64bit]
[ 162.146786] pci 0000:01:00.1: supports D1 D2
[ 162.146830] pci 0000:01:00.1: System wakeup disabled by ACPI
[ 162.146899] pci 0000:00:01.0: PCI bridge to [bus 01]
[ 162.146904] pci 0000:00:01.0: bridge window [io 0x5000-0x5fff]
[ 162.146908] pci 0000:00:01.0: bridge window [mem 0xdc400000-0xdc4fffff]
[ 162.146914] pci 0000:00:01.0: bridge window [mem 0xe0000000-0xefffffff 64bit pref]
[ 162.146921] pci_bus 0000:01: Allocating resources
[ 162.146930] pci 0000:01:00.0: can't claim BAR 6 [mem 0xfffe0000-0xffffffff pref]: no compatible bridge window
[ 162.146936] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 162.146941] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 162.146945] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 162.146951] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 162.146956] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 162.146967] pci 0000:01:00.0: BAR 6: assigned [mem 0xdc440000-0xdc45ffff pref]
[ 162.146970] pci 0000:00:01.0: PCI bridge to [bus 01]
[ 162.146972] pci 0000:00:01.0: bridge window [io 0x5000-0x5fff]
[ 162.146975] pci 0000:00:01.0: bridge window [mem 0xdc400000-0xdc4fffff]
[ 162.146978] pci 0000:00:01.0: bridge window [mem 0xe0000000-0xefffffff 64bit pref]
[ 162.147669] [drm] initializing kernel modesetting (CEDAR 0x1002:0x68E0 0x1025:0x0359).
[ 162.147692] [drm] register mmio base: 0xDC400000
[ 162.147694] [drm] register mmio size: 131072
[ 162.147697] vga_switcheroo: enabled
[ 162.147758] ATPX version 1, functions 0x000000bf
[ 162.179303] ATOM BIOS: Acer
[ 162.179384] radeon 0000:01:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
[ 162.179387] radeon 0000:01:00.0: GTT: 1024M 0x0000000020000000 - 0x000000005FFFFFFF
[ 162.179389] [drm] Detected VRAM RAM=512M, BAR=128M
[ 162.179390] [drm] RAM width 64bits DDR
[ 162.179491] [TTM] Zone kernel: Available graphics memory: 1856954 kiB
[ 162.179493] [TTM] Initializing pool allocator
[ 162.179497] [TTM] Initializing DMA pool allocator
[ 162.179521] [drm] radeon: 512M of VRAM memory ready
[ 162.179522] [drm] radeon: 1024M of GTT memory ready.
[ 162.179535] [drm] Loading CEDAR Microcode
[ 162.179542] [drm] Internal thermal controller with fan control
[ 162.184385] [drm] radeon: dpm initialized
[ 162.184499] [drm] GART: num cpu pages 262144, num gpu pages 262144
[ 162.187590] [drm] PCIE GART of 1024M enabled (table at 0x000000000025E000).
[ 162.187739] radeon 0000:01:00.0: WB enabled
[ 162.187743] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff880099009c00
[ 162.187745] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff880099009c0c
[ 162.188678] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x000000000005c418 and cpu addr 0xffffc90019f9c418
[ 162.188688] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 162.188689] [drm] Driver supports precise vblank timestamp query.
[ 162.188691] radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[ 162.188731] radeon 0000:01:00.0: radeon: using MSI.
[ 162.188759] [drm] radeon: irq initialized.
[ 162.205589] [drm] ring test on 0 succeeded in 2 usecs
[ 162.205600] [drm] ring test on 3 succeeded in 5 usecs
[ 162.381860] [drm] ring test on 5 succeeded in 2 usecs
[ 162.381871] [drm] UVD initialized successfully.
[ 162.382330] [drm] ib test on ring 0 succeeded in 0 usecs
[ 162.382380] [drm] ib test on ring 3 succeeded in 0 usecs
[ 163.032446] [drm] ib test on ring 5 succeeded
[ 163.037787] [drm] Radeon Display Connectors
[ 163.037791] [drm] Connector 0:
[ 163.037793] [drm] LVDS-2
[ 163.037796] [drm] DDC: 0x6460 0x6460 0x6464 0x6464 0x6468 0x6468 0x646c 0x646c
[ 163.037797] [drm] Encoders:
[ 163.037799] [drm] LCD1: INTERNAL_UNIPHY
[ 163.037801] [drm] Connector 1:
[ 163.037802] [drm] HDMI-A-1
[ 163.037804] [drm] HPD1
[ 163.037807] [drm] DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
[ 163.037808] [drm] Encoders:
[ 163.037810] [drm] DFP1: INTERNAL_UNIPHY1
[ 163.037811] [drm] Connector 2:
[ 163.037813] [drm] VGA-2
[ 163.037816] [drm] DDC: 0x64d8 0x64d8 0x64dc 0x64dc 0x64e0 0x64e0 0x64e4 0x64e4
[ 163.037817] [drm] Encoders:
[ 163.037819] [drm] CRT1: INTERNAL_KLDSCP_DAC1
[ 163.156621] radeon 0000:01:00.0: No connectors reported connected with modes
[ 163.156628] [drm] Cannot find any crtc or sizes - going 1024x768
[ 163.157939] [drm] fb mappable at 0xE045F000
[ 163.157941] [drm] vram apper at 0xE0000000
[ 163.157941] [drm] size 3145728
[ 163.157942] [drm] fb depth is 24
[ 163.157943] [drm] pitch is 4096
[ 163.158075] radeon 0000:01:00.0: fb1: radeondrmfb frame buffer device
[ 163.158237] [drm] Initialized radeon 2.40.0 20080528 for 0000:01:00.0 on minor 2
[ 163.158403] snd_hda_intel 0000:01:00.1: Handle VGA-switcheroo audio client
[ 163.158605] pci_bus 0000:04: Allocating resources
[ 163.158623] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 163.158632] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 163.158638] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 163.158645] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 163.158651] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 163.159292] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 163.159303] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 163.159310] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 163.159321] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 163.159330] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 163.159432] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 163.159438] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 163.159444] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 163.159454] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 163.159463] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 163.159562] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 163.159570] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 163.159577] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 163.159588] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 163.159596] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 163.159633] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 163.159639] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 163.159646] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 163.159655] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 163.159665] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 163.159912] pci_bus 0000:02: Allocating resources
[ 163.159961] pci_bus 0000:03: Allocating resources
[ 163.159983] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 163.159990] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 163.159997] pci 0000:00:1e.0: bridge window [io 0x3000-0x3fff]
[ 163.160008] pci 0000:00:1e.0: bridge window [mem 0xd0000000-0xd01fffff]
[ 163.160016] pci 0000:00:1e.0: bridge window [mem 0xd0200000-0xd03fffff 64bit pref]
[ 163.164586] input: HDA ATI HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input36
在搜索类似的消息时，我遇到了一些提示，最后我pci=noacpi先尝试了启动选项，noacpi然后再尝试。他们解决了问题，但不幸的是，这两种情况都导致我的 USB 鼠标无法工作（我没有测试过其他外部 USB 设备）。
这里有什么问题？为什么 12.04 可以正常运行？我该如何解决这个问题，同时保持鼠标和其他 USB 设备正常运行？
谢谢。
更新：经过进一步研究，我发现这可能与我的笔记本电脑上的双切换显卡有关，它在 15.04 更新的内核上看起来已经损坏：
https://bugs.freedesktop.org/show_bug.cgi?id=88927
https://bugzilla.kernel.org/show_bug.cgi?id=79701
我通过radeon.runpm=0启动选项解决了这个问题，但是现在独立显卡的动态开启/关闭不起作用，所以我的系统更热，电池寿命更短。
答案1
答案2
我在 Ubuntu 15.04 上遇到了同样的问题。通过删除解决了这个psensors问题
sudo apt-get remove psensors