On Friday 12 February 2010, Alan Stern wrote:
> 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?
Quite frankly I'm not sure. Greg, do you know?
> 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?
That depends on the graphics adapter. Is it Intel or AMD?
Rafael
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