问题：[ 20.473125] composite sync not supported当我运行时，我看到了几个这样的条目dmesg。它们是什么意思？
背景：我正在尝试调试问题我的笔记本电脑无法挂起。由于 acpi 似乎很正常，而且我可以从命令行轻松挂起，因此我开始追踪所有启动错误/警告。
于是我跑了出去dmesg | grep not，除了其他的事情之外，我得到了：
728:[ 17.267120] composite sync not supported
733:[ 18.009061] composite sync not supported
740:[ 18.159289] registered panic notifier
749:[ 18.162500] vga16fb: not registering due to another framebuffer present
757:[ 18.598251] composite sync not supported
776:[ 20.473125] composite sync not supported
777:[ 20.932266] composite sync not supported
778:[ 28.350231] composite sync not supported
779:[ 28.924913] composite sync not supported
780:[ 35.480658] composite sync not supported
第一次出现（第 728 行）前后几行的完整日志列在我的帖子底部（我很乐意包含其他内容）。有什么想法可能导致这种情况吗？我读过几个网站：
一篇帖子谈论“Adobe flash”导致此错误？
其他一些还表明这可能是与 nvidia 相关的问题，但我有一台带有集成英特尔显卡的戴尔 Latitude D630 - 所以 nvidia 不是问题所在。
[ 17.207142] phy0: Selected rate control algorithm 'minstrel'
[ 17.207833] Registered led device: b43-phy0::tx
[ 17.207849] Registered led device: b43-phy0::rx
[ 17.207865] Registered led device: b43-phy0::radio
[ 17.207927] Broadcom 43xx driver loaded [ Features: PL, Firmware-ID: FW13 ]
[ 17.267120] composite sync not supported
[ 17.415795] EXT4-fs (sda2): mounted filesystem with ordered data mode
[ 17.602131] [drm] initialized overlay support
[ 17.620201] input: DualPoint Stick as /devices/platform/i8042/serio1/input/input7
[ 17.641192] input: AlpsPS/2 ALPS DualPoint TouchPad as /devices/platform/i8042/serio1/input/input8
[ 18.009061] composite sync not supported
[ 18.106042] pcmcia_socket pcmcia_socket0: cs: IO port probe 0x100-0x3af: clean.
[ 18.108115] pcmcia_socket pcmcia_socket0: cs: IO port probe 0x3e0-0x4ff: clean.
[ 18.108941] pcmcia_socket pcmcia_socket0: cs: IO port probe 0x820-0x8ff: clean.
[ 18.109676] pcmcia_socket pcmcia_socket0: cs: IO port probe 0xc00-0xcf7: clean.
[ 18.110356] pcmcia_socket pcmcia_socket0: cs: IO port probe 0xa00-0xaff: clean.
[ 18.159286] fb0: inteldrmfb frame buffer device
[ 18.159289] registered panic notifier
[ 18.160218] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/LNXVIDEO:01/input/input9
[ 18.160286] ACPI: Video Device [VID1] (multi-head: yes rom: no post: no)
[ 18.160334] ACPI Warning for \_SB_.PCI0.VID2._DOD: Return Package has no elements (empty) (20090903/nspredef-433)
[ 18.160432] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/LNXVIDEO:02/input/input10
[ 18.160491] ACPI: Video Device [VID2] (multi-head: yes rom: no post: no)
[ 18.160539] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[ 18.162494] vga16fb: initializing
[ 18.162497] vga16fb: mapped to 0xc00a0000
[ 18.162500] vga16fb: not registering due to another framebuffer present
[ 18.176091] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21
[ 18.176123] HDA Intel 0000:00:1b.0: setting latency timer to 64
[ 18.285752] input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/input/input11
[ 18.312497] input: HDA Intel Mic at Ext Left Jack as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12
[ 18.312586] input: HDA Intel HP Out at Ext Left Jack as /devices/pci0000:00/0000:00:1b.0/sound/card0/input13
[ 18.328043] usbcore: registered new interface driver ndiswrapper
[ 18.460909] Console: switching to colour frame buffer device 180x56
[ 18.598251] composite sync not supported
答案1
嗯，还是不知道这是什么意思。 然而，为了让它消失，我按照说明进行操作这里并添加了 grub 选项nomodeset。现在这些错误都消失了，还有一些我认为很奇怪的东西，比如：
vga16fb: not registering due to another framebuffer present
和其他人。希望这对其他人有所帮助...我不会给自己答案。如果有人能解释这个错误，以及（？也许？）它与Xorg 的合成，那么我会很乐意奖励积分（或赏金 - 如果我获得足够的积分的话）。〜m
请注意，我确实最低限度添加 Xorg 扩展以禁用合成，这只会使五行中的一行composite sync not supported消失。所以我撤消了此更改并继续搜索，直到找到上述 grub 选项，它可以消除所有错误。