On Wednesday, 2 of January 2008, Ingo Molnar wrote: > > (David Brownell Cc:-ed too) > > * Rafael J. Wysocki <rjw@xxxxxxx> wrote: > > > Well, we have the following test script in the userland suspend > > package that is supposed to work right now: > > > > #!/bin/bash > > date > > cd /sys/class/rtc/rtc0 > > echo $(( $(cat since_epoch) + 20 )) > wakealarm > > s2ram > > date > > > > provided that the new rtc driver code is compiled (and the old one is not). > > ok, will try that. A stupid question. The old RTC driver is in > drivers/char/rtc.c, and maps to: > > crw-r--r-- 1 root root 10, 135 Oct 25 18:02 /dev/rtc > > the new driver is in drivers/rtc/*, and maps to: > > crw-r--r-- 1 root root 254, 0 Dec 12 02:30 /dev/rtc0 > > but all the x86 distro boxes i have access to make use of /dev/rtc. > There's no symlink set up from /dev/rtc to /dev/rtc0 either. So it > appears to me that the new RTC driver isnt actually utilized on most > distributions. I think so. > shouldnt we provide a Kconfig way of replacing dev 10:135 with the new > driver's 254:0 device? (while keeping all the current modes of operation > as well, of course.) It's all supposed to be 100% ioctl ABI compatible > with the old driver, right? That way distros could start migrating to it > as well, without depending on any udev hackery. Question for Dave. ;-) > > > That way any suspend breakage would be detectable (and bisectable) > > > in automated testing - if the resume does not come back after 10-20 > > > seconds then the test failed. > > > > Yes, but please note that some systems require user space > > manipulations of the graphics adapter for suspend to work and to > > detect a breakage of such a system you need to boot it into X and use > > s2ram to suspend. > > yeah, i wouldnt expect graphics mode to come back without quirks. But it > should still work fine over the network, right? (which is my main mode > of testing anyway) Well, if the graphics is sufficiently broken, it won't resume at all. The "echo core > /sys/power/pm_test && echo mem > /sys/power/state" thing should always work, though (IOW, if this doesn't work, we cartainly have a bug). Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
