[Intel-gfx] resume lagginess and other problems

[Andrew Lutomirski]

On Tue, Jan 26, 2010 at 4:33 PM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> On Tue, 26 Jan 2010 16:20:52 -0500
> Andrew Lutomirski <luto at mit.edu> wrote:
>
>> My system (Lenovo X200s, GM45, 2.6.33-rc5) often has weird issues
>> resuming from standby.  I get a laggy cursor for awhile, kscreenlocker
>> takes a long time (seconds to minutes) to prompt for a password, and I
>> have high power consumption (maybe separate bug).
>>
>> I think that when this is happening, Xorg takes a lot of CPU, and udev
>> goes nuts (!).
>>
>> Here's a udevmonitor trace.  Any ideas?  (I have problems with both
>> KDE and GNOME, and the udevmonitor output rules out userspace issues,
>> I think.)  dmesg shows nothing interesting looking.
>>
>
> Sounds like you're getting a bunch of hotplug notifications on resume,
> maybe due to lid events.  This may cause X to re-probe things, which
> can take some time and CPU in the kernel.

As far as I can see, all of those "CHANGE" events have no effect (i.e.
nothing about the device node actually changed).  Why is the driver
generating them?

Is there any way to log ACPI events on resume to see if you're right?

Thanks,
Andy