[Bug 543477] Re: resume from hibernate fails on thinkpad t410

[mukesh agrawal]

Hi Jeremy,

I can confirm that this (or perhaps a more restricted) problem occurs
with 2.6.32-0206321203-generic from the mainline PPA. I could not test
with the kernel linked from http://kernel.ubuntu.com/~kernel-
ppa/mainline/daily/current/, as that kernel hangs at boot time.

The problem appears to be related to the X server. In particular, it
only occurs if I resume (from hibernation) with an external display
attached. (Whether or not the external display was attached at
hibernation time does not matter.) If I resume without the external
display attached, things work fine. And I can later attach the display
and activate it (using Fn-F7 on my Thinkpad keyboard to alternate
between modes until I get the one I want).

I believe the problem used to occur even without the external display,
so it seems like things have improved somewhat.

For what it's worth, I'm using a DVI display, attached to the
DisplayPort via a DisplayPort to DVI adapter from Lenovo. Also, when I
resume with the external display attached, I'm able to terminate the X
server using Alt-SysRq-K. Not convenient, since that means losing all
the apps that were running. But perhaps a sign that it's not a kernel
bug?

Let me know if I can provide any more information to help debug.

** Tags removed: needs-upstream-testing

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resume from hibernate fails on thinkpad t410
https://bugs.launchpad.net/bugs/543477
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