Hi all, I think I've tracked down the "slow wakeup" to in-kernel power-management in https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1421455 . Basically powerd instructs the kernel to wake up by writing the string "on" to /sys/power/state and something inside the kernel takes much longer than expected. powerd blocks on this write() for about half a second and only then turns on the screen, which takes a bit of time as well, so the total time from the power button press to a visible image on the screen is slightly more than one second on my device.
Sadly I don't know how to debug the kernel issue. kind regards, Simon On 16.04.2015 18:54, Ari Börde Kröyer wrote: > Hi > > Here is an issue I have had since I installed Ubuntu on my Nexus 4 in > October 2014, and now it has appeared on my Bq Aquaris e4.5 > approximately 3 weeks after I got the phone. > > Often, but not always, when pushing the power button to make the screen > wake up, nothing happens. After waiting a few seconds, I push the button > again and the screen wakes up for a fraction of a second and then turns > off. The behavior suggests that the second time the button was pushed it > was registered as a "switch off screen" command. This can repeat itself > a few times. Usually, I have to push the button slightly harder/more > decisively (perhaps a hint longer) in order for the screen to wake up > and stay on. Very annoying. > > I wonder if others have experienced this issue? > > I originally wrote it off to wear on my somewhat old Nexus 4 handset, > but since it appeared on my brand new Bq Aquaris, I wish to report this > as a bug. Problem: I don't know what it can be related to, so I don't > know where to register this bug. Can someone give me a link? > > Thanks, > Ari > -- Mailing list: https://launchpad.net/~ubuntu-phone Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-phone More help : https://help.launchpad.net/ListHelp
