我使用 XUbuntu 14.04 有线连接到路由器，在计算机启动后它工作正常，但几分钟后它会随机关闭。以下是我尝试解决此问题的几种方法：
1. Disable avahi-daemon
2. Disable IPv6
3. Change IP to static
4. Install latest ethernet drivers (r8168)
所有这些都没有帮助。我的网卡内置在主板中：
➜ ~ lspci | awk '/net/ {print $1}' | xargs -i% lspci -ks %
07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
Subsystem: ASRock Incorporation Motherboard (one of many)
Kernel driver in use: r8168
现在我注意到断开连接后，系统日志中附加了以下内容：
Sep 8 16:55:14 re-desktop kernel: [ 191.242192] r8168: eth0: link up
Sep 8 16:55:14 re-desktop kernel: [ 191.242266] sched: RT throttling activated
Sep 8 16:55:16 re-desktop NetworkManager[900]: <info> (eth0): carrier now OFF (device state 100, deferring action for 4 seconds)
Sep 8 16:55:18 re-desktop kernel: [ 195.262852] r8168: eth0: link up
Sep 8 16:55:18 re-desktop NetworkManager[900]: <info> (eth0): carrier now ON (device state 100)
Sep 8 16:55:19 re-desktop kernel: [ 196.469329] irq 19: nobody cared (try booting with the "irqpoll" option)
Sep 8 16:55:19 re-desktop kernel: [ 196.469340] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G OE 3.19.0-26-generic #28~14.04.1-Ubuntu
Sep 8 16:55:19 re-desktop kernel: [ 196.469345] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./970 Extreme4, BIOS P2.20 10/12/2012
Sep 8 16:55:19 re-desktop kernel: [ 196.469349] ffff88042828f2a4 ffff88043ec83e18 ffffffff817aeed7 0000000000000001
Sep 8 16:55:19 re-desktop kernel: [ 196.469356] ffff88042828f200 ffff88043ec83e48 ffffffff810ce576 ffff88043ec8e4c0
Sep 8 16:55:19 re-desktop kernel: [ 196.469363] ffff88042828f200 0000000000000013 0000000000000000 ffff88043ec83e98
Sep 8 16:55:19 re-desktop kernel: [ 196.469369] Call Trace:
Sep 8 16:55:19 re-desktop kernel: [ 196.469372] <IRQ> [<ffffffff817aeed7>] dump_stack+0x45/0x57
Sep 8 16:55:19 re-desktop kernel: [ 196.469391] [<ffffffff810ce576>] __report_bad_irq+0x36/0xd0
Sep 8 16:55:19 re-desktop kernel: [ 196.469398] [<ffffffff810ceaac>] note_interrupt+0x24c/0x2a0
Sep 8 16:55:19 re-desktop kernel: [ 196.469405] [<ffffffff814c559a>] ? add_interrupt_randomness+0x3a/0x1e0
Sep 8 16:55:19 re-desktop kernel: [ 196.469412] [<ffffffff810cc19e>] handle_irq_event_percpu+0xae/0x1a0
Sep 8 16:55:19 re-desktop kernel: [ 196.469419] [<ffffffff810cc2d1>] handle_irq_event+0x41/0x70
Sep 8 16:55:19 re-desktop kernel: [ 196.469425] [<ffffffff810ceed2>] handle_fasteoi_irq+0x82/0x140
Sep 8 16:55:19 re-desktop kernel: [ 196.469431] [<ffffffff81017682>] handle_irq+0x22/0x40
Sep 8 16:55:19 re-desktop kernel: [ 196.469437] [<ffffffff817b9821>] do_IRQ+0x51/0xf0
Sep 8 16:55:19 re-desktop kernel: [ 196.469444] [<ffffffff817b762d>] common_interrupt+0x6d/0x6d
Sep 8 16:55:19 re-desktop kernel: [ 196.469447] <EOI> [<ffffffff810ebd13>] ? tick_program_event+0x23/0x30
Sep 8 16:55:19 re-desktop kernel: [ 196.469459] [<ffffffff8105b976>] ? native_safe_halt+0x6/0x10
Sep 8 16:55:19 re-desktop kernel: [ 196.469466] [<ffffffff81460cb8>] arch_safe_halt+0x9/0xd
Sep 8 16:55:19 re-desktop kernel: [ 196.469471] [<ffffffff8146158b>] acpi_safe_halt+0x22/0x2b
Sep 8 16:55:19 re-desktop kernel: [ 196.469476] [<ffffffff814615af>] acpi_idle_do_entry+0x1b/0x2b
Sep 8 16:55:19 re-desktop kernel: [ 196.469480] [<ffffffff81461610>] acpi_idle_enter_c1+0x51/0x70
Sep 8 16:55:19 re-desktop kernel: [ 196.469487] [<ffffffff8164feb5>] cpuidle_enter_state+0x55/0x170
Sep 8 16:55:19 re-desktop kernel: [ 196.469493] [<ffffffff81650087>] cpuidle_enter+0x17/0x20
Sep 8 16:55:19 re-desktop kernel: [ 196.469499] [<ffffffff810b5404>] cpu_startup_entry+0x334/0x3d0
Sep 8 16:55:19 re-desktop kernel: [ 196.469506] [<ffffffff81048cf7>] start_secondary+0x197/0x1c0
Sep 8 16:55:19 re-desktop kernel: [ 196.469511] handlers:
Sep 8 16:55:19 re-desktop kernel: [ 196.469536] [<ffffffffc01df320>] ahci_single_level_irq_intr [libahci]
Sep 8 16:55:19 re-desktop kernel: [ 196.469540] Disabling IRQ #19
对我来说，这似乎是我的 ASRock 970 Extreme4 主板的硬件故障。
除此之外，PC 在过去几周内开始随机冻结，有时甚至在重置后也拒绝启动 BIOS。当计算机无法启动时，视频卡风扇非常响，我尝试拔下其中一个显示器（我有 2 个显示器通过 DVI 连接），这基本上解决了冻结问题。这让我相信视频卡（比Palit GeForce 260PC 的其他部分要旧得多）应该更换，但现在我不确定。
这是硬件问题吗？我应该更换主板吗？还是显卡故障会导致这种情况？