Rafael:
My newly-installed desktop system is experiencing a couple of problems
with system sleep. (Oddly enough, the old one was working fairly
well...)
The first has to do with the serial port. It doesn't appear to resume
correctly. I booted with:
console=ttyS0,115200 console=tty0 earlyprintk=serial,ttyS0,115200
no_console_suspend
Then I did "echo processors >pm_test ; echo mem >state". In spite of
the no_console_suspend, data stopped going out through the serial port
after the following appeared:
[ 273.664785] PM: Preparing system for mem sleep
[ 273.677133] Freezing user space processes ... (elapsed 0.01 seconds) done.
[ 273.698837] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
[ 273.718799] PM: Entering mem sleep
[ 273.794463] serial 00:05: disabled
even though things continued to appear on the VT screen. The only
other text to show up on the serial monitor was this line:
[ 279.069204] serial 00:05: activated
The normal sequence of messages showed up on the screen, but everything
was oddly slow. Check out some sample timestamps:
[ 332.120130] ehci_hcd 0000:00:1d.7: GetStatus port 8 status 001005 POWER sig=se0 PE CONNECT
[ 334.592054] usb 2-8: finish resume
[ 335.613747] PM: resume of devices complete after 56629.644 msecs
[ 337.426230] PM: Finishing wakeup.
[ 338.430797] Restarting tasks ...
[ 339.378108] usb 2-8: usb auto-suspend
[ 340.554760] hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0000
[ 342.204128] done.
[ 342.816603] hub 2-0:1.0: state 7 ports 8 chg 0000 evt 0000
The delay between each line and its successor is proportional to the
line's length, as though the kernel were still trying to send the
characters out through the serial port but at 360 baud! Is anybody in
charge of the 8250 driver these days?
The bigger problem is that with a normal sleep ("echo none >pm_test"),
the system doesn't wake up. Pressing a key or a mouse button does
nothing. Pressing the power button causes the machine to start up
again, but the screen remains blank and there's no response to network
pings.
This was with more or less standard 2.6.33-rc6 (Greg KH's patch set was
applied but none of your PM patches). The motherboard is an Intel
ICH5 with a 32-bit CPU. Any ideas on ways to approach this?
Alan Stern
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