Re: [regression, bisected] adb trackpad disappears after suspend to ram
From: Rafael J. Wysocki
Date: Fri May 29 2009 - 14:10:33 EST
On Friday 29 May 2009, Jan Scholz wrote:
> Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> writes:
> >> We are too late in the cycle to revert this commit and it really is needed to
> >> fix a more serious issue. Nevertheless knowing that it caused the problem to
> >> appear on your system is also important.
> >> Ben, do you have an idea what may be going on here? Does __disable_irq() mask
> >> the interrupt on this platform?
> > I suppose so :-) I'll have to check what's going on, it's not
> > immediately clear to me.
> > Cheers,
> > Ben.
> >> I'd like to see a boot log, preferably containing a suspend-resume in which
> >> the problem was reproduced.
> Here is a log from booting, through several suspend cycles, until the
> trackpad disappeared. The first few suspends were done while X was
> running but from the console. As you can tell from lines like
> May 28 23:51:26 [kernel] adb devices: : 2 c4 : 3 1 : 7 1f
> the trackpad was still present. The last suspend was done from within X,
> here the trackpad did not make it.
> May 28 23:58:09 [kernel] adb devices: : 2 c4 : 7 1f
> However, there have been cases, although not in this log, were the
> trackpad has been alive even when suspending from within X.
This means the problem is probably timing-related.
Can you please try to comment out suspend_device_irqs() and
resume_device_irqs() in drivers/base/power/main.c and see if that changes
anything? It's not entirely safe (well, that's why the calls are there after
all), but hopefully the box won't hang during this test.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/