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    SubjectRe: [PATCH 0/4] PM: Do not destroy/create devices while suspended (rev. 2)

    (David Brownell Cc:-ed too)

    * Rafael J. Wysocki <> 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

    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.

    > > 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)


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