I gave your new test kernel a whirl but unfortunately, it triggers the 100% CPU problem on my computer.
Regarding the lost hotplugging, it seems it was not due to the last patch I added. I will try to see what happened between 2.6.27-7 and 2.6.27-9 that caused this.
@Andy Whitcroft -- the patches I used can be found here: git.kernel. org/?p= linux/kernel/ git/torvalds/ linux-2. 6.git;a= commitdiff; h=47bf31adc541b ef0c20de15e800e 0011f1ae70c7 git.kernel. org/?p= linux/kernel/ git/torvalds/ linux-2. 6.git;a= commitdiff; h=898b054f3eec5 921320ae8614b5b dd7b07ea5b43
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The last one I added only for my 2.6.27-10~ppa2 kernel.
I gave your new test kernel a whirl but unfortunately, it triggers the 100% CPU problem on my computer.
Regarding the lost hotplugging, it seems it was not due to the last patch I added. I will try to see what happened between 2.6.27-7 and 2.6.27-9 that caused this.
But I'm hoping Andy will beat me to it :-)