linux-kernel - 2.6.37-rc7: screen black after several suspends

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Date:	Sun, 2 Jan 2011 11:17:21 +0100
From:	Nico Schottelius <nico-linux-20101229@...ottelius.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Nico Schottelius <nico-linux-20101229@...ottelius.org>
Subject: 2.6.37-rc7: screen black after several suspends

Good morning guys,

with 2.6.37-rc7 automatic wifi reconnect works, but after several
suspend and resume issues the screen stays black. I am running
Linux on the Lenovo X201, Intel graphics card [0].

Earlier kernel versions (around 2.6.35, iirc) sometimes allowed me
to restore it by switching away from X to the console, which stopped
working broken display (weired characters everywhere) after some time.

With 2.6.37-rc7 this does not work. After about 4-5 suspends the screen
stays black, the machine is still working otherwise (i.e. rebooting
it works fine).

It seems there's a long ongoing problem restoring the display,
seeing it in various forms (including freeze) in at least

  * 2.6.27-rc1-00156-g94ad374,
  * 2.6.28-next-20090107-ikn
  * 2.6.28-ikn-06859-gede6f5a
  * 2.6.28-rc9-wl-ikn-24949-ge98df74
  * 2.6.29-rc4-58-g4c098bc,
  * 2.6.29-rc5-ikn-00168-gba95fd4
  * 2.6.30-rc7
  * 2.6.31-r2
  * many many more, see messages from me to LKML

With some working version (just brighness related):

  * 2.6.29-rc7-wl-ikn-32831-g98c5597
  * 2.6.30-rc3-next-20090428-04067-g72f1b63

I'm wondering whether there 

  a) is one bug coming up again and not really fixed
  b) are many bugs, just parts fixed
  c) new bugs are introduced quite often

In any case, I downgraded to 2.6.36-ARCH, which works fine related to
brightness and suspend/resume.

Cheers,

Nico

[0] 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02).

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