We finally found the reason for this. Our kernel had the patch from http://bugzilla.kernel.org/show_bug.cgi?id=12950 applied, to improve performance for netbooks. This patch was now identified as causing this regression, and we reverted it.
Thus I close this bug report now. Lubos, if you want to "take over" this bug, please reopen; perhaps you could check if above patch is in Gentoo as well?
We finally found the reason for this. Our kernel had the patch from http:// bugzilla. kernel. org/show_ bug.cgi? id=12950 applied, to improve performance for netbooks. This patch was now identified as causing this regression, and we reverted it.
Thus I close this bug report now. Lubos, if you want to "take over" this bug, please reopen; perhaps you could check if above patch is in Gentoo as well?