I have here an Intel Classmate hardware sample, and I have a weird problem with suspend to ram, the machine does a power off when resuming. I isolated the problem to the button acpi module, without loading it (or just removing it before doing a s2ram) I don't get the problem. In the specific machine I have here I can only resume it pressing the power button, so I think this is related. I started looking into the kernel code and did some tests. The first thing I tried just as a test was to disable the code in acpi_button_notify function. As expected it stopped to send the power button key events to /proc/acpi/event, but I still got the same s2ram issues. But if I disable acpi_install_fixed_event_handler calls in acpi_button_install_notify_handlers the power off issue in s2ram was gone, of course also with power button not notifying anything anymore :), but this was just a test. After this tests then I went further to try to track down the problem and I saw acpi_ev_fixed_event_dispatch, that is the function that will call acpi_button_notify_fixed. First thing I noted: the comment about acpi_ev_fixed_event_dispatch says it will return INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED, but acpi_button_notify_fixed return AE_OK, is this right (comment is outdated) or am I missing something? Anyway I changed AE_OK to ACPI_INTERRUPT_HANDLED but this didn't change nothing. In the end I stopped there, doesn't seem to be anything wrong with the code at all, I also took a look at acpi_ev_fixed_event_detect and other code related to the table of fixed events (acpi_gbl_fixed_event_handlers), but didn't got more clues. Could be this a bios issue, or there is some hints to what I can try to look and prove that it's bios or code related? PS.: with netconsole I don't get any message before power off after resume, I tried it to get more hints. -- []'s Herton - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
