Public bug reported:

Binary package hint: linux-image-2.6.20-15-generic

Hi,

Ubuntu 7.04 freezes on my new HP Pavilion. I think this is kernel
related. I use linux-image-2.6.20-15-generic for i386 (I can't use the
64bit version, but that's another problem I will report later).

The freeze only happens when I am in console or splash screen mode. When
I'm using X I have no problems and can use the computer without
problems. But during start up or shutdown or when I am running programs
in the console(not xterm but /dev/tty1) the computer freezes. I also see
that the computer freezes more easily when I run program that produces a
lot of output to stdout, such as "dmesg". After the freeze the cpu fan
starts to go a little bit faster, but not full speed, so the kernel is
probably busy with something.

I tried to do some research. So, I striped down my initrd to only
contain modules needed to find the hard drive then I started ubuntu with
the kernel arg "init=/bin/bash". This should bring down the computer to
simplest mode. Now I can run dmesg a lot of times without any crash.
Next thing I did was to load the ehci_hcd module which detects my usb
system. I tried to type some letters on the usb keyboard. usbhid is not
loaded yet so the letters did not show up on the console, but when I run
dmesg again (from the built in keyboard) the kernel freezes!!. So I was
thinking this is usb related. I added all usb modules to the blacklist
and rebooted my computer normally. This didn't help, the computer still
freezes when I switch to consolemode and run dmesg.

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
kernel freeze on HP Pavillion dv9000 Turion64x2
https://bugs.launchpad.net/bugs/112775
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