> What do you mean, exactly? For example, does the monitor turn off? If > you disconnect the mouse and then reconnect, how can you tell whether the > keyboard is getting no power or simply isn't communicating with the > computer? Can you tell whether this happens at the time you disconnect > the mouse or the time you reconnect it?
No, the monitor doesn't turn off. I know that the devices get no power, by checking the LED on the optical mouse, as well as by hitting Caps Lock and getting no light from the corresponding LED on the keyboard. They loose power as soon as I disconnect a low speed device from the monitor hub. And at that point I can't ping the computer anymore. > If you access the computer over the network, what shows up in > /proc/bus/usb/devices? What shows up in the output from dmesg? dmesg: Linux version 2.4.29 (gcc version 3.2.2) #1 Wed Jan 26 12:53:26 EST 2005 BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000003ff2fc00 (usable) BIOS-e820: 000000003ff2fc00 - 000000003ff30000 (ACPI NVS) BIOS-e820: 000000003ff30000 - 000000003ff40000 (ACPI data) BIOS-e820: 000000003ff40000 - 000000003fff0000 (ACPI NVS) BIOS-e820: 000000003fff0000 - 0000000040000000 (reserved) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fed13000 - 00000000fed1a000 (reserved) BIOS-e820: 00000000fed1c000 - 00000000feda0000 (reserved) 127MB HIGHMEM available. 896MB LOWMEM available. On node 0 totalpages: 261935 zone(0): 4096 pages. zone(1): 225280 pages. zone(2): 32559 pages. ACPI: RSDP (v000 ACPIAM ) @ 0x000f4eb0 ACPI: RSDT (v001 INTEL D915GAG 0x20041201 MSFT 0x00000097) @ 0x3ff30000 ACPI: FADT (v002 INTEL D915GAG 0x20041201 MSFT 0x00000097) @ 0x3ff30200 ACPI: MADT (v001 INTEL D915GAG 0x20041201 MSFT 0x00000097) @ 0x3ff30390 ACPI: MCFG (v001 INTEL D915GAG 0x20041201 MSFT 0x00000097) @ 0x3ff30400 ACPI: ASF! (v016 LEGEND I865PASF 0x00000001 INTL 0x02002026) @ 0x3ff36020 ACPI: TCPA (v001 INTEL TBLOEMID 0x00000001 MSFT 0x00000097) @ 0x3ff360c0 ACPI: WDDT (v001 INTEL OEMWDDT 0x00000001 INTL 0x02002026) @ 0x3ff360f4 ACPI: DSDT (v001 INTEL D915GAG 0x00000001 INTL 0x02002026) @ 0x00000000 Kernel command line: ro root=/dev/hda3 hdc=ide-scsi ide_setup: hdc=ide-scsi Initializing CPU#0 Detected 3200.174 MHz processor. Console: colour VGA+ 80x25 Calibrating delay loop... 6383.20 BogoMIPS Memory: 1031908k/1047740k available (1924k kernel code, 15444k reserved, 665k data, 140k init, 130236k highmem) Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes) Inode cache hash table entries: 65536 (order: 7, 524288 bytes) Mount cache hash table entries: 512 (order: 0, 4096 bytes) Buffer cache hash table entries: 65536 (order: 6, 262144 bytes) Page-cache hash table entries: 262144 (order: 8, 1048576 bytes) CPU: Trace cache: 12K uops, L1 D cache: 16K CPU: L2 cache: 1024K Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. CPU: After generic, caps: bfebfbff 00000000 00000000 00000000 CPU: Common caps: bfebfbff 00000000 00000000 00000000 CPU: Intel(R) Pentium(R) 4 CPU 3.20GHz stepping 04 Enabling fast FPU save and restore... done. Enabling unmasked SIMD FPU exception support... done. Checking 'hlt' instruction... OK. ACPI: IRQ9 SCI: Level Trigger. POSIX conformance testing by UNIFIX mtrr: v1.40 (20010327) Richard Gooch ([EMAIL PROTECTED]) mtrr: detected mtrr type: Intel ACPI: Subsystem revision 20040326 PCI: Using configuration type 1 ACPI: Interpreter enabled ACPI: Using PIC for interrupt routing ACPI: System [ACPI] (supports S0 S1 S4 S5) ACPI: PCI Root Bridge [PCI0] (00:00) PCI: Probing PCI hardware (bus 00) PCI: Ignoring BAR0-3 of IDE controller 00:1f.2 Transparent bridge - Intel Corp. 82801BA/CA/DB/EB PCI Bridge ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEGP._PRT] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P2._PRT] ACPI: Power Resource [URP1] (off) ACPI: Power Resource [FDDP] (off) ACPI: Power Resource [LPTP] (off) ACPI: Power Resource [URP2] (off) ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEX1._PRT] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEX2._PRT] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEX3._PRT] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEX4._PRT] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12 14 15) ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 *9 10 11 12 14 15) ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 *5 6 7 9 10 11 12 14 15) ACPI: PCI Interrupt Link [LNKE] (IRQs *3 4 5 6 7 9 10 11 12 14 15) ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 9 *10 11 12 14 15) PCI: Probing PCI hardware ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 11 ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 10 ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 9 ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 5 ACPI: PCI Interrupt Link [LNKH] enabled at IRQ 10 ACPI: PCI Interrupt Link [LNKE] enabled at IRQ 3 PCI: Using ACPI for IRQ routing isapnp: Scanning for PnP cards... isapnp: No Plug & Play device found Linux NET4.0 for Linux 2.4 Based upon Swansea University Computer Society NET3.039 Initializing RT netlink socket Starting kswapd allocated 32 pages and 32 bhs reserved for the highmem bounces VFS: Disk quotas vdquot_6.5.1 Journalled Block Device driver loaded ACPI: Power Button (FF) [PWRF] ACPI: Processor [CPU1] (supports C1, 8 throttling states) ACPI: Processor [CPU2] (supports C1, 8 throttling states) pty: 2048 Unix98 ptys configured Serial driver version 5.05c (2001-07-08) with MANY_PORTS MULTIPORT SHARE_IRQ SERIAL_PCI ISAPNP enabled ttyS00 at 0x03f8 (irq = 4) is a 16550A Real Time Clock Driver v1.10f Floppy drive(s): fd0 is 1.44M keyboard: Timeout - AT keyboard not present?(ed) keyboard: Timeout - AT keyboard not present?(f4) FDC 0 is a post-1991 82077 RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx hda: ST380817AS, ATA DISK drive hdc: HL-DT-ST GCE-8526B, ATAPI CD/DVD-ROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 ide1 at 0x170-0x177,0x376 on irq 15 hda: attached ide-disk driver. hda: host protected area => 1 hda: 156301488 sectors (80026 MB) w/8192KiB Cache, CHS=9729/255/63 Partition check: hda: hda1 hda2 hda3 ide: late registration of driver. SCSI subsystem driver Revision: 1.00 Loading Adaptec I2O RAID: Version 2.4 Build 5 Detecting Adaptec I2O RAID controllers... kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2 kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2 Fusion MPT base driver 2.05.16 Copyright (c) 1999-2004 LSI Logic Corporation mptbase: 0 MPT adapters found, 0 installed. Fusion MPT SCSI Host driver 2.05.16 md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27 md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. NET4: Linux TCP/IP 1.0 for NET4.0 IP Protocols: ICMP, UDP, TCP, IGMP IP: routing cache hash table of 8192 buckets, 64Kbytes TCP: Hash tables configured (established 262144 bind 65536) Linux IP multicast router 0.06 plus PIM-SM NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. RAMDISK: Compressed image found at block 0 Freeing initrd memory: 65k freed VFS: Mounted root (ext2 filesystem). EXT3-fs: INFO: recovery required on readonly filesystem. EXT3-fs: write access will be enabled during recovery. kjournald starting. Commit interval 5 seconds EXT3-fs: recovery complete. EXT3-fs: mounted filesystem with ordered data mode. Freeing unused kernel memory: 140k freed Adding Swap: 1831400k swap-space (priority -1) usb.c: registered new driver usbdevfs usb.c: registered new driver hub PCI: Setting latency timer of device 00:1d.7 to 64 ehci_hcd 00:1d.7: PCI device 8086:265c (Intel Corp.) ehci_hcd 00:1d.7: irq 10, pci mem f8918000 usb.c: new USB bus registered, assigned bus number 1 ehci_hcd 00:1d.7: BIOS handoff failed (104, 1010001) ehci_hcd 00:1d.7: enabled 64bit PCI DMA PCI: cache line size of 128 is not supported by device 00:1d.7 ehci_hcd 00:1d.7: USB 2.0 enabled, EHCI 1.00, driver 2003-Dec-29/2.4 hub.c: USB hub found hub.c: 8 ports detected usb-uhci.c: $Revision: 1.275 $ time 12:59:35 Jan 26 2005 usb-uhci.c: High bandwidth mode enabled PCI: Setting latency timer of device 00:1d.0 to 64 usb-uhci.c: USB UHCI at I/O 0xe000, IRQ 10 usb-uhci.c: Detected 2 ports usb.c: new USB bus registered, assigned bus number 2 hub.c: USB hub found hub.c: 2 ports detected PCI: Setting latency timer of device 00:1d.1 to 64 usb-uhci.c: USB UHCI at I/O 0xe400, IRQ 5 usb-uhci.c: Detected 2 ports usb.c: new USB bus registered, assigned bus number 3 hub.c: USB hub found hub.c: 2 ports detected PCI: Setting latency timer of device 00:1d.2 to 64 usb-uhci.c: USB UHCI at I/O 0xe800, IRQ 9 usb-uhci.c: Detected 2 ports usb.c: new USB bus registered, assigned bus number 4 hub.c: USB hub found hub.c: 2 ports detected PCI: Setting latency timer of device 00:1d.3 to 64 usb-uhci.c: USB UHCI at I/O 0xec00, IRQ 11 usb-uhci.c: Detected 2 ports usb.c: new USB bus registered, assigned bus number 5 hub.c: USB hub found hub.c: 2 ports detected usb-uhci.c: v1.275:USB Universal Host Controller Interface driver hub.c: new USB device 00:1d.7-1, assigned address 2 hub.c: USB hub found hub.c: 4 ports detected hub.c: new USB device 00:1d.1-1, assigned address 2 usb.c: USB device 2 (vend/prod 0x45e/0x39) is not claimed by any active driver. hub.c: new USB device 00:1d.7-1.2, assigned address 3 usb.c: USB device 3 (vend/prod 0xa81/0x101) is not claimed by any active driver. usb.c: registered new driver hiddev usb.c: registered new driver hid input: USB HID v1.10 Mouse [Microsoft Microsoft 5-Button Mouse with IntelliEye(TM)] on usb3:2.0 input: USB HID v1.10 Keyboard [CHESEN USB Keyboard] on usb1:3.0 input: USB HID v1.10 Device [CHESEN USB Keyboard] on usb1:3.1 hid-core.c: v1.8.1 Andreas Gal, Vojtech Pavlik <[EMAIL PROTECTED]> hid-core.c: USB HID support drivers mice: PS/2 mouse device common for all mice EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,3), internal journal kjournald starting. Commit interval 5 seconds EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,1), internal journal EXT3-fs: mounted filesystem with ordered data mode. hdc: attached ide-scsi driver. scsi0 : SCSI host adapter emulation for IDE ATAPI devices Vendor: HL-DT-ST Model: CD-RW GCE-8526B Rev: 1.03 Type: CD-ROM ANSI SCSI revision: 02 Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0 sr0: scsi3-mmc drive: 52x/52x writer cd/rw xa/form2 cdda tray Uniform CD-ROM driver Revision: 3.12 ip_tables: (C) 2000-2002 Netfilter core team ip_conntrack version 2.1 (8185 buckets, 65480 max) - 288 bytes per conntrack Intel(R) PRO/100 Network Driver - version 2.3.43-k1 Copyright (c) 2004 Intel Corporation e100: selftest OK. e100: eth0: Intel(R) PRO/100 Network Connection Hardware receive checksums enabled e100: eth0 NIC Link is Up 100 Mbps Full duplex apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16) apm: overridden by ACPI. PCI: Setting latency timer of device 01:00.0 to 64 NVRM: loading NVIDIA Linux x86 NVIDIA Kernel Module 1.0-6629 Wed Nov 3 13:12:51 PST 2004 /proc/bus/usb/devices: T: Bus=05 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB UHCI Root Hub S: SerialNumber=ec00 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms T: Bus=04 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB UHCI Root Hub S: SerialNumber=e800 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms T: Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB UHCI Root Hub S: SerialNumber=e400 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB UHCI Root Hub S: SerialNumber=e000 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 8 B: Alloc= 6/800 us ( 1%), #Int= 4, #Iso= 0 D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 2.04 S: Manufacturer=Linux 2.4.29 ehci_hcd S: Product=PCI device 8086:265c (Intel Corp.) S: SerialNumber=00:1d.7 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=256ms T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 4 D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=02 MxPS=64 #Cfgs= 1 P: Vendor=0543 ProdID=116a Rev=ff.ff C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=01 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=256ms I: If#= 0 Alt= 1 #EPs= 1 Cls=09(hub ) Sub=00 Prot=02 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=256ms T: Bus=01 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0a81 ProdID=0101 Rev= 1.10 S: Manufacturer=CHESEN S: Product=USB Keyboard C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=hid E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=hid E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl=10ms T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=02 Dev#= 4 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=045e ProdID=0039 Rev= 3.00 S: Manufacturer=Microsoft S: Product=Microsoft 5-Button Mouse with IntelliEye(TM) C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=hid E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=10ms > > This same behaviour occurs > > when having mouse and keyboard on the monitor hub and using the switch > > button to... switch. The swich has this button which allows me to switch > > between 4 computers. I have only one computer going through the switch at > > this point, but I can still press the button to switch and I expect that > > when I get back to the first port, where the computer is connected, I > > should be able to use the mouse and keyboard. > > > > The result: the computer goes to a state where I can't even ping it anymore! > > Is this really the same behavior as "all devices seem to get no power"? Well, yes. The devices loose power and I can't ping the computer. And this happens whether I manually disconnect the mouse/keyboard or press the button on the switch. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. 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