Bug 257801

Hello,

I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the fedora kernel.

http://fedoraproject.org/wiki/KernelBugTriage

I am CC'ing myself to this bug and will try and assist you in resolving it if I can.

There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel? If you are, you might like
to try some of the following which may resolve the issue for you:

# Find out if the system is locked up completely by hitting the caps lock key.

* If the capslock light doesn't toggle, the system is completely dead. Try
again, but this time before suspending, activate the pm_trace functionality with
echo 1 > /sys/power/pm_trace. This reprograms the real time clock to contain a
few bytes of information which we can use to diagnose which driver failed to
resume. After the hang, reboot, boot up again, and save the output of dmesg.

* If the capslock light does toggle, then the system did come back up, and it's
possible that we just failed to reinitialise the video.
http://people.freedesktop.org/~hughsient/quirk may contain further useful
information to diagnose this problem. It may also be useful to initiate the
suspend from a tty (ctrl-alt-f1) and run pm-suspend ; dmesg > dmesg.out ; sync
by hand. Upon resuming you'll now have some more debug info to sift through.
Additionally, this way when it resumes, you already have a console logged in
from which you can type commands 'blind'. Trying vbetool post for example may
bring things back to life. 

# Try rmmod'ing various modules before doing the suspend. If this makes things
work again, retry with a smaller set of modules unloaded. Keep retrying until
you narrow down which module is to blame.

# Another trick that sometimes works to force video to come back up is to enable
the BIOS password. This makes the system resume in a VGA text mode that the
kernel recovers from a lot easier. Not a real solution, but it can help to
diagnose other problems.

# Proprietary 3d graphics driver users should test with respective open source
drivers.

# Laptops using the nv driver should be considered hibernate-only capable as per
https://www.redhat.com/archives/fedora-test-list/2007-September/msg00365.html

If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.

I haven't tried the various tricks you mentioned, but...

2.6.22.5 seemed to actually work with both pm-suspend and pm-hibernate.

Unfortunately, I just updated to 2.6.22.9 and now pm-hibernate is broken again
(doesn't save out to disk, hangs with 4 lines of text at top of screen just
before it should start saving to disk).

Also, there is a known bug that pm-suspend jacks the screen brightness to max on
resume, though the current workaround of switching to a vt and then back to the
X vt, is easy enough for the timebeing.

further info-

I just got 2.6.22.9 to work with pm-hibernate.

I think that all along there may have just been something strange about the very
first time I try pm-hibernate on a new kernel, i.e. it hangs on the stopping
consoles text.

I'll post more success/failure info as it happens until I can figure out a clear
pattern...

Okay, thanks for the update. There is a whole bunch of suspend/resume fixes
coming with 2.6.23 as well so this might stamp on the issues once and for all.
If you can post (as text/plain attachments) any debugging output such as dmesg
after sus/resume that would be good. An lsmod output would be interesting as well.

Hi there,

Any update on this?

call it fixed.

I still have issues with the backlight brightness getting reset during sleep,
suspend, qemu, and mplayer, but thats a different thing.