On Mon, 22 Feb 2010, Rafael J. Wysocki wrote: > On Monday 22 February 2010, you wrote: > > On Mon, 22 Feb 2010, Rafael J. Wysocki wrote: > > > > > > Here's what I got: > > > > > > > > [ 3.349334] PM: Resume from disk failed. > > > > [ 3.350060] Magic number: 0:141:321 > > > > [ 3.352583] hash matches drivers/base/power/main.c:477 > > > > [ 3.355144] tty tty46: hash matches > > > > [ 3.357742] i915 0000:00:02.0: hash matches > > > > > > > > So it appears that the video driver is indeed the culprit. Is there > > > > any way to narrow it down further? > > > > > > Not without adding some debug code to the driver. > > > > > > Which version of the kernel is this? > > > > 2.6.33-rc8. The same problem occurs with earlier versions, such as > > Fedora 12's 2.6.31.9 (which is what I'm running now). > > I _think_ think the i915 KMS doesn't work on your box for some reason. > > Doesn the screen switch to the graphics framebuffer when booted with > vga=0? Yes, it does switch. > If not, you probably need to enable framebuffer console in .config (the i915 > KMS depends on that actually). It's already enabled. That is, CONFIG_FB and CONFIG_FRAMEBUFFER_CONSOLE are both set to 'y'. > > > > Here's my /proc/acpi/wakeup: > > > > > > > > Device S-state Status Sysfs node > > > > P0P4 S4 disabled pci:0000:00:1e.0 > > > > MC97 S4 disabled > > > > USB1 S4 disabled pci:0000:00:1d.0 > > > > USB2 S4 disabled pci:0000:00:1d.1 > > > > USB3 S4 disabled pci:0000:00:1d.2 > > > > USB4 S4 disabled pci:0000:00:1d.3 > > > > EUSB S4 disabled pci:0000:00:1d.7 > > > > PS2K S4 disabled pnp:00:09 > > > > PS2M S4 disabled pnp:00:0a > > > > GBEN S4 disabled > > > > > > > > It appears that PS2K is the keyboard. If I write "PS2K" to > > > > /proc/acpi/wakeup, I get: > > > > > > > > ACPI: 'PS2M' and 'PS2K' have the same GPE, can't disable/enable one seperately > > > > > > > > Apart from the misspelling, this doesn't bode well for making the > > > > keyboard a wakeup device. > > > > > > This only means both will be enabled at the same time. > > > > > > > Furthermore, these values are not properly tied to the values in sysfs. > > > > > > They are independent and the sysfs values probably don't matter for these > > > devices. What are the contents of /proc/acpi/wakeup after writing PS2K to it? > > > > Unchanged -- both PS2K and PS2M continue to be disabled. > > That sounds like a bug. Please try to write 'PS2M' to it too. I was wrong (don't know why). Writing PS2K does indeed enable both. And sure enough, doing that allows the system to wake up in response to a key press. It still hangs during the video resume, though. > > Why are the values independent from the wakeup settings in sysfs? > > Aren't they supposed to mean the same thing? > > Not really. There are two separate flags for wakeup. One of them is a > property of the "physical" device object (eg. PCI device structure) and that > one is set/unset via sysfs. The other is a property of the device's ACPI > "shadow" object and is set/unset through /proc/acpi/wakeup (this mechanism > is regarded as obsolete, but it looks like some devices have not been converted > to the sysfs-based one yet). It looks like the inline routines defined in include/linux/pm_wakeup.h should call corresponding platform-specific routines. Apparently _no_ drivers have been converted in this way -- since the conversion needs to be part of the core. In fact, there isn't even a platform-specific hook for enabling or disabling wakeup devices; we should have a platform_wakeup_ops structure. Would such a thing be acceptable? Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
