Debian & USB ferrado [SOLUÇÃO]

[Sergio Luz <sluz.ba@gmail.com>]

PROBLEMA
O Windows 2000 passou a entrar em modo de segurança em uma máquina e 
aproveitei para convencer o usuário a usar Linux. Ao instalar o Linux 
(tentei Debian Sarge e BR-CDD pre 6) mensagens de erro rolavam sem parar 
na console (em todas que estivessem abilitadas) depois do primeiro boot 
e impediam a conclusão da instalação. As mensagem de erro podem ser 
vistas no final deste texto.

DIAGNÓSTICO
Estressei memória e CPU por 12 horas cada e nenhuma mensagem de erro foi 
exibida. Analizando as mensagens de erro que rolavam na console, parecia 
tratar-se de algum problema com o barramento USB.
A tentativa de desabilitar o uso de USB na BIOS falhou pois o Linux faz 
o reconhecimento de hardware sem consultar a BIOS.

SOLUÇÃO
Todas as respostas obtidas na listan indicavam a utilização do parâmetro 
*nousb* durante a instalação, mas mesmo que este parâmetro fosse 
utilizado o problema persistia. Utilziar o parâmetro 
debian-installer/probe/usb=fase também não resolvia

Pesquisando um pouco mais as mensagens de erro, descobri a URL 
http://www.ic.unicamp.br/~norton/debian_acer_aspire_1355LC.html#memus
que indicava poder tratar-se de conflito entre USB e ACPI. Com isto 
instalei o Sarge com a parametrização que se segue, considerando que meu 
hardware não tem PCMCIA nem SCSI e que *o barramento USB realmente está 
com problemas*
:linux26 nosub noacpi nopcmcia noscsi.

Apesar das mensagens de erro ainda surgirem uma ou duas vezes, o boot 
prossegue normalmente. Assim, foi possível concluir a instalação do 
Sarge e utilizá-lo (inclusive a interface gráfica).

CURIOSIDADE
Tinha uma impressora USB ligada na porta USB do micro e esta solução só 
funcionou depois que eu desconectei o cabo. Se o cabo USB for colocado 
de volta, mesmo com a impressora desligada, as mensagens de erro começam 
a rolar de nova e o sistema não entra no ar. Alguém sabe por que isto 
acontece? Suspeito que tenha algo haver com a sinalização nos 
dispositivos USB, mas queria os detalhes.

------< mensagens de erro depois do primeiro boot >------
(...)
 umount: /target/dev/pts: Invalid argument
 umount: /target/dev/shm: Invalid argument
 umount: /target/proc/bus/usb: Invalid argument
 Reading Package Lists...
 (...)
 Aug 29 22:30:47 kernel: usbcore: registered new driver usbfs
 Aug 29 22:30:47 kernel: usbcore: registered new driver hub
 Aug 29 22:30:47 kernel: USB Universal Host Controller Interface
 driver v2.2
 Aug 29 22:30:47 kernel: PCI: Found IRQ 9 for device 0000:00:07.2
 Aug 29 22:30:47 kernel: uhci_hcd 0000:00:07.2: Intel Corp.
 82371AB/EB/MB
 PIIX4 USB
 Aug 29 22:30:47 kernel: uhci_hcd 0000:00:07.2: irq 9, io base
 0000de00
 Aug 29 22:30:47 kernel: uhci_hcd 0000:00:07.2: new USB bus
 registered,
 assigned bus number 1
 Aug 29 22:30:47 kernel: hub 1-0:1.0: USB hub found
 Aug 29 22:30:47 kernel: hub 1-0:1.0: 2 ports detected
 Aug 29 22:30:47 kernel: usbcore: registered new driver usbkbd
 Aug 29 22:30:47 kernel: drivers/usb/input/usbkbd.c: :USB HID Boot
 Protocol keyboard driver
 Aug 29 22:30:47 kernel: usbcore: registered new driver hiddev
 Aug 29 22:30:47 kernel: usbcore: registered new driver usbhid
 Aug 29 22:30:47 kernel: drivers/usb/input/hid-core.c: v2.0:USB HID
 core
 driver
 Aug 29 22:30:47 kernel: drivers/usb/serial/usb-serial.c: USB Serial
 support registered for Generic
 Aug 29 22:30:47 kernel: usbcore: registered new driver
 usbserial_generic
 Aug 29 22:30:47 kernel: usbcore: registered new driver usbserial
 Aug 29 22:30:47 kernel: drivers/usb/serial/usb-serial.c: USB Serial
 Driver core v2.0
 (...)
 Aug 29 22:30:47 kernel: usb 1-1: new low speed USB device using
 address 2
 (...)
 Aug 29 22:30:48 kernel: usb 1-1: device not accepting address 2,
 error -71
 Aug 29 22:30:48 kernel: usb 1-1: new low speed USB device using
 address 3
 (...)
 Aug 29 22:30:48 kernel: usb 1-1: device not accepting address 3,
 error -71
 Aug 29 22:30:48 kernel: usb 1-2: new full speed USB device using
 address 4
 Aug 29 22:30:49 kernel: usb 1-1: new low speed USB device using
 address 5
 Aug 29 22:30:49 kernel: usb 1-1: device not accepting address 5,
 error -71
 Aug 29 22:30:49 kernel: usb 1-1: new low speed USB device using
 address 6
 Aug 29 22:30:50 kernel: usb 1-1: device not accepting address 6,
 error -71
 Aug 29 22:30:50 kernel: usb 1-2: USB disconnect, address 4
 Aug 29 22:30:50 kernel: usb 1-2: new full speed USB device using
 address 7
 Aug 29 22:30:50 kernel: usb 1-1: new low speed USB device using
 address 8
 Aug 29 22:30:51 kernel: usb 1-1: device not accepting address 8,
 error -71
 Aug 29 22:30:51 kernel: usb 1-1: new low speed USB device using
 address 9
 Aug 29 22:30:51 kernel: usb 1-1: device not accepting address 9,
 error -71
 Aug 29 22:30:51 kernel: usb 1-2: USB disconnect, address 7
 Aug 29 22:30:51 kernel: usb 1-2: new full speed USB device using
 address 10
 Aug 29 22:30:52 kernel: usb 1-1: new low speed USB device using
 address 11
 Aug 29 22:30:52 kernel: usb 1-1: device not accepting address 11,
 error -71
 Aug 29 22:30:52 kernel: usb 1-1: new low speed USB device using
 address 12
 (...)
 Aug 29 22:30:52 kernel: usb 1-1: device not accepting address 12,
 error -71
 Aug 29 22:30:52 kernel: usb 1-2: USB disconnect, address 10
 Aug 29 22:30:53 kernel: usb 1-2: new full speed USB device using
 address 13
 Aug 29 22:30:53 kernel: usb 1-1: new low speed USB device using
 address 14
 Aug 29 22:30:53 kernel: usb 1-1: device not accepting address 14,
 error -71
 Aug 29 22:30:53 kernel: usb 1-1: new low speed USB device using
 address 15
 Aug 29 22:30:54 kernel: usb 1-1: device not accepting address 15,
 error -71
 Aug 29 22:30:54 kernel: usb 1-2: USB disconnect, address 13
 Aug 29 22:30:54 kernel: usb 1-2: new full speed USB device using
 address 16
 Aug 29 22:30:54 kernel: usb 1-1: new low speed USB device using
 address 17
 Aug 29 22:30:55 kernel: usb 1-1: device not accepting address 17,
 error -71
 Aug 29 22:30:55 kernel: usb 1-1: new low speed USB device using
 address 18
 Aug 29 22:30:55 kernel: usb 1-1: device not accepting address 18,
 error -71
 Aug 29 22:30:55 kernel: usb 1-2: USB disconnect, address 16
 Aug 29 22:30:55 kernel: usb 1-2: new full speed USB device using
 address 19
 Aug 29 22:30:56 kernel: usb 1-1: new low speed USB device using
 address 20
 Aug 29 22:30:56 kernel: usb 1-1: device not accepting address 20,
 error -71
 Aug 29 22:30:56 kernel: usb 1-1: new low speed USB device using
 address 21
 Aug 29 22:30:57 kernel: usb 1-1: device not accepting address 21,
 error -71
 Aug 29 22:30:57 kernel: usb 1-2: USB disconnect, address 19
 Aug 29 22:30:57 kernel: usb 1-2: new full speed USB device using
 address 22
 Aug 29 22:30:57 kernel: usb 1-1: new low speed USB device using
 address 23
 Aug 29 22:30:57 kernel: usb 1-1: device not accepting address 23,
 error -71
 Aug 29 22:30:58 kernel: usb 1-1: new low speed USB device using
 address 24
 Aug 29 22:30:58 kernel: usb 1-1: device not accepting address 24,
 error -71
 Aug 29 22:30:58 kernel: usb 1-2: USB disconnect, address 22
 Aug 29 22:30:58 kernel: usb 1-2: new full speed USB device using
 address 25
 Aug 29 22:30:58 kernel: usb 1-1: new low speed USB device using
 address 26
 Aug 29 22:30:59 kernel: usb 1-1: device not accepting address 26,
 error -71
 Aug 29 22:30:59 kernel: usb 1-1: new low speed USB device using
 address 27
 (...)
 Aug 29 22:30:59 kernel: usb 1-1: device not accepting address 27,
 error -71
 Aug 29 22:30:59 kernel: usb 1-2: USB disconnect, address 25
 Aug 29 22:31:00 kernel: usb 1-2: new full speed USB device using
 address 28
 Aug 29 22:31:00 kernel: usb 1-1: new low speed USB device using
 address 29
 Aug 29 22:31:00 kernel: usb 1-1: device not accepting address 29,
 error -71
 Aug 29 22:31:00 kernel: usb 1-1: new low speed USB device using
 address 30
 Aug 29 22:31:01 kernel: usb 1-1: device not accepting address 30,
 error -71
 Aug 29 22:31:01 kernel: usb 1-2: USB disconnect, address 28
 (...)
 Aug 29 22:31:01 kernel: usb 1-1: new low speed USB device using
 address 32
 Aug 29 22:31:02 kernel: usb 1-1: device not accepting address 32,
 error -71
 Aug 29 22:31:02 kernel: usb 1-1: new low speed USB device using
 address 33
 Aug 29 22:31:02 kernel: usb 1-1: device not accepting address 33,
 error -71
 Aug 29 22:31:02 kernel: usb 1-2: USB disconnect, address 31
 Aug 29 22:31:02 kernel: usb 1-2: new full speed USB device using
 address 34
 Aug 29 22:31:03 kernel: usb 1-1: new low speed USB device using
 address 35
 Aug 29 22:31:03 kernel: usb 1-1: device not accepting address 35,
 error -71
 Aug 29 22:31:03 kernel: usb 1-1: new low speed USB device using
 address 36
 (...)
 Aug 29 22:31:03 kernel: usb 1-1: device not accepting address 36,
 error -71
 Aug 29 22:31:03 kernel: usb 1-2: USB disconnect, address 34
 (...)
 Aug 29 22:31:04 kernel: usb 1-2: new full speed USB device using
 address 37
 Aug 29 22:31:04 kernel: usb 1-1: new low speed USB device using
 address 38
 Aug 29 22:31:04 kernel: usb 1-1: device not accepting address 38,
 error -71
 Aug 29 22:31:04 kernel: usb 1-1: new low speed USB device using
 address 39
 Aug 29 22:31:05 kernel: usb 1-1: device not accepting address 39,
 error -71
 Aug 29 22:31:05 kernel: usb 1-2: USB disconnect, address 37
 (...)