On Mon, 01 Sep 2008, Zhao Yakui wrote: > Will the above two patches hit the upstream kernel? If the above two patches hits the upstream kernel, it > seems that the boot option of "ec_intr=" comes back again and EC can't be switched from interrupt mode to polling > mode if EC GPE interrupt is missing. In such case maybe the battery/AC/thermal driver can't work well if the info of > battery/AC/thermal is related with EC. Maybe there exists the regression on some laptops. Right now, the fact that it gives up on interrupt mode too easily IS causing regressions on ThinkPads (like the T43 I own). Since polling mode does work, it is just a performance regression, so you won't get many reports about it since most people don't look for such stuff in their kernel logs. Some ECs trigger the interrupt/poll-mode checks just on small windows (typically during resume -- might even be a bug somewhere in ACPICA or Linux, and not on the EC). We should not be giving up using interrupt mode on these so easily. Maybe retry enabling interrupt mode after some seconds a few times (like 3 or 5)? If it is a transient problem, that will avoid the permanent performance regression of polled mode. -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
