Hi, I'd like to ask those of you who own a system that supports Intel Rapid Start Technology (IRST) to perform a simple test to determine whether my laptop (XPS13 9333) is the only system affected by a bug related to IRST that I recently found or not. In the past months I noticed random transitions from S3 to S0 with no apparent reason. After some recent tests I found a way to trigger those automatic state transitions. It seems that the timer in charge of the resume of the system for the transition to S4 is not re-initialized on resume/suspend. Exactly "wakeup_time" minutes after the transition from S0 to S3, the system will automatically transition from S3 to S0 instead of S4 if within that interval it transitioned to S0 at least once. Everything works as expected if the system is never resumed or if the system is suspended after "wakeup_time" minutes have passed since the first suspension to ram. In addition to that, changing the values of wakeup_time and wakeup_events seems to have no effect until the timer has expired. According to the Implementation Guide [1] there are no special requirements other than the standard S3 ACPI support. Still, IRST works as intended only on Windows. This makes me wonder whether the problem is due to some vendor specific change or not. To quickly replicate the problem, follow the following steps: set the timer to 1 minute and suspend the system. Immediately after that, resume and suspend the system again. If it automatically wakes up after 1 minute has passed since the first suspension, then the system is affected by the bug. If this is the case, I'd suggest to default wakeup_events to 0 or 2 to prevent issues and add some sort of warning somewhere to let users know about this problem. Regards, Gabriele [1] http://downloadmirror.intel.com/22647/eng/Intel%20Rapid%20Start%20Technology%20Deployment%20Guide%20v1.0.pdf -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
