Re: [linux-pm] [PATCH v2] Add suspend/resume for HPET

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On 4/1/07, David Brownell <david-b@xxxxxxxxxxx> wrote:
for those will all get grouped together ... suspended "very late" and
resumed "very early", regardless of when they get registered.  Pretty
much the driver model parts of what Linus was suggesting; clockevent
bits would still be needed.

I tested your patch with CONFIG_NO_HZ=y, but it still hangs while
suspending to disk (before the percent saving).

But one discovery. I get tired of all these hangs, so I decided to
press some keys and the power button. Accidentally, the suspend
proceeded and successfully suspended!

I tried many more times, and discovered that to proceed with the
suspend, hit any 4 keys slowly. (e.g. "F1 F2 F3 F4", or "1 2 3 4").

My .config has CONFIG_NO_HZ=y and CONFIG_HIGH_RES_TIMERS=y, but I
suppose CONFIG_HIGH_RES_TIMERS=y gots nothing to do with the hang.

I went back with my vanilla 2.6.21-rc5 with Maxim's patch, and with
hitting the keys, I could suspend to disk with CONFIG_NO_HZ=y and
CONFIG_HIGH_RES_TIMERS=y.

Jeff.
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