On Saturday 18 February 2006 12:49 pm, Andrew Morton wrote:
> 
> I thought we'd fixed this hang?  It's been known about for a
> month or so?

Seems like a slightly different case, with a similar symptom.  One
that's still caused by the BIOS, of course:


> Cold boot works fine, and this problem doesn't happen on *every* warm boot 
> (but
> does occur most of the time).

Which means that it's a BIOS bug that doesn't trigger in all cases.

However, it's also confusing that the bug doesn't match the downstream
bug that allegedly corresponds to this.  In particular, this report
claims the issue appears with 2.6.14-rc4, and the downstream bug
describes older kernels _without_ a patch that addresses a similar
bug that also "hangs at this point".

Are we sure the bug report is really against 2.6.14-rc4?  That seems
oddly fast for a bug to get through the Gentoo bug database and then
get bounced up to the osdl database ...



> Further investigation shows that it hangs in quirk_usb_disable_ehci() at this 
> point:
> 
>                       /* always say Linux will own the hardware
>                        * by setting EHCI_USBLEGSUP_OS.
>                        */
>                       pci_write_config_byte(pdev, offset + 3, 1);
> 
> The pci_write_config_byte call never returns. This happens on the first
> iteration of the loop.



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