Based on kernel version 4.1. Page generated on 2015-06-28 12:14 EST.
1 Testing suspend and resume support in device drivers 2 (C) 2007 Rafael J. Wysocki <firstname.lastname@example.org>, GPL 3 4 1. Preparing the test system 5 6 Unfortunately, to effectively test the support for the system-wide suspend and 7 resume transitions in a driver, it is necessary to suspend and resume a fully 8 functional system with this driver loaded. Moreover, that should be done 9 several times, preferably several times in a row, and separately for hibernation 10 (aka suspend to disk or STD) and suspend to RAM (STR), because each of these 11 cases involves slightly different operations and different interactions with 12 the machine's BIOS. 13 14 Of course, for this purpose the test system has to be known to suspend and 15 resume without the driver being tested. Thus, if possible, you should first 16 resolve all suspend/resume-related problems in the test system before you start 17 testing the new driver. Please see Documentation/power/basic-pm-debugging.txt 18 for more information about the debugging of suspend/resume functionality. 19 20 2. Testing the driver 21 22 Once you have resolved the suspend/resume-related problems with your test system 23 without the new driver, you are ready to test it: 24 25 a) Build the driver as a module, load it and try the test modes of hibernation 26 (see: Documentation/power/basic-pm-debugging.txt, 1). 27 28 b) Load the driver and attempt to hibernate in the "reboot", "shutdown" and 29 "platform" modes (see: Documentation/power/basic-pm-debugging.txt, 1). 30 31 c) Compile the driver directly into the kernel and try the test modes of 32 hibernation. 33 34 d) Attempt to hibernate with the driver compiled directly into the kernel 35 in the "reboot", "shutdown" and "platform" modes. 36 37 e) Try the test modes of suspend (see: Documentation/power/basic-pm-debugging.txt, 38 2). [As far as the STR tests are concerned, it should not matter whether or 39 not the driver is built as a module.] 40 41 f) Attempt to suspend to RAM using the s2ram tool with the driver loaded 42 (see: Documentation/power/basic-pm-debugging.txt, 2). 43 44 Each of the above tests should be repeated several times and the STD tests 45 should be mixed with the STR tests. If any of them fails, the driver cannot be 46 regarded as suspend/resume-safe.