[Intel-gfx] X (or the screensaver or the compositor) sometimes wedges on resume

[Andrew Lutomirski]

This might be the wrong list, but here goes...

On my X200s (GM45) laptop, my system sometimes lags badly on resume.
This seems to mostly happen after the laptop has been suspended for a
long time (an hour or more, maybe).  The symptoms are that, starting a
second or two after resuming, nothing updates on the screen.  I can
usually, but not always, move the mouse.  The CPU is mostly idle.  I
usually see the unlock window, but I can sometimes see all the windows
behind the screensaver.

Switching VTs works fine, and VTs other than X also work fine, but
when I switch back to X, it's still hung.  Killing kscreenlocker
sometimes fixes it.  Other times I have to kill kwin as well.  The
problem usually resolves itself after a minute or so, though.

Since I usually have this issue on KDE (kwin + kscreenlocker) but I
just saw the same problem on GNOME (i.e. compiz + gnome-screensaver),
I'm wondering if it could be a problem with Xorg or the intel driver.

Any ideas or debugging hints?  I can't trigger it at will, but I see
it very often after suspending for awhile.

Thanks,
Andy