Re: [gentoo-user] strange dmesg output - RESOLVED

[Alan McKinnon <alan.mckinnon@gmail.com>]

On Tuesday 27 October 2009 03:38:53 Maxim Wexler wrote:
> Ok, this is too weird. While mucking around in the kernel I noticed
> that the scroll back buffer wasn't set. So I configured it and gave it
> 128 bytes to play with. 

It's 128 kilo bytes just btw :-)


> Sez I, well at least I'll be able to scroll
> back to the start of all that verbiage. That's the only change I've
> made since turning USB_STORAGE debugging off.
> 
> After a reboot, dmesg behaved and gives me a complete rundown on
> startup all the way back to the prompt!
> 
> So, since in the digital world, things don't "just happen", can
> someone enlighten me, or anyone else who's interested, in the
> connection between the scrollback buffer and usb-storage, if any?


There isn't a connection. Why do you think there is one?

You enabled scrollback so now the console has retained enough of the kernel 
console output that you can scroll back to the beginning without using all 
128K.



Symbol: VGACON_SOFT_SCROLLBACK_SIZE [=256]
Prompt: Scrollback Buffer Size (in KB)
  Defined at drivers/video/console/Kconfig:37
  Depends on: HAS_IOMEM && VT && VGACON_SOFT_SCROLLBACK

Symbol: VGACON_SOFT_SCROLLBACK [=y]
Prompt: Enable Scrollback Buffer in System RAM
  Defined at drivers/video/console/Kconfig:22
  Depends on: HAS_IOMEM && VT && VGA_CONSOLE

Symbol: USB_STORAGE [=m]
Prompt: USB Mass Storage support
  Defined at drivers/usb/storage/Kconfig:9
  Depends on: USB_SUPPORT && USB && SCSI

Symbol: USB_STORAGE_DEBUG [=n]
Prompt: USB Mass Storage verbose debug
  Defined at drivers/usb/storage/Kconfig:27
  Depends on: USB_SUPPORT && USB_STORAGE

Symbol: USB_SUPPORT [=y]
Prompt: USB support
  Defined at drivers/usb/Kconfig:5 
  Depends on: HAS_IOMEM 


-- 
alan dot mckinnon at gmail dot com