x3100 resume results in black screen (2.6.25 kernel)

[Jesse Barnes]

On Friday, May 09, 2008 1:14 pm Khashayar Naderehvandi wrote:
> On Fri, May 9, 2008 at 10:03 PM, Jesse Barnes <jbarnes at virtuousgeek.org>
>
> wrote:
> > On Friday, May 09, 2008 12:41 pm Khashayar Naderehvandi wrote:
> > > On 5/9/08, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> > > > On Friday, May 09, 2008 10:05 am Khashayar Naderehvandi wrote:
> > > > > Running ubuntu hardy with a 2.6.25 kernel causes the backlight of
> > > > > my
> > > >
> > > > laptop
> > > >
> > > > > to remain black after resume. Switching VTs does not help.
> > > > >
> > > > > Hardy ships with a 2.6.24 kernel which works just fine, I installed
> > > > > a 2.6.25 kernel since it causes far fewer wakeups (as observed with
> > > > > powertop).
> > > > >
> > > > > I have also tried the 2.6.24 kernel with drm modules from git. This
> > > > > also fails on resume.
> > > > >
> > > > > The laptop is a dell xps m1330 with an x3100 chipset.
> > > >
> > > > Does a suspend/resume from the console after loading the i915 DRM
> >
> > driver
> >
> > > > fail
> > > > in the same way?
> > > >
> > > >
> > > > No, that works just fine.
> >
> > Ok, so the console always comes back correctly if you suspend from the
> > console... that's a start.  Are you using vesafb, intelfb, uvesafb or any
> > other framebuffer drivers?
>
> Not as far as I know, but here's an output of lsmod | grep fb
>
> fbcon                  42912  0
> tileblit                3456  1 fbcon
> font                    9472  1 fbcon
> bitblit                 6784  1 fbcon
>
> > > In fact, resume works fine sometimes (well, it worked at least once),
> > > but most of the time it fails. I tried to get it working some more
> > > using the 2.6.24 kernel with updated drm and i915 modules. What
> > > happens, more exactly, is that upon resume the only thing that comes
> > > back is the
> >
> > cursor.
> >
> > > I can move the cursor around but I can't change VTs, neither can I
> >
> > restart
> >
> > > the X server with ctrl-alt-backspace. I managed to suspend the laptop
> >
> > once
> >
> > > more in this state (by closing the lid). Upon opening the lid again,
> >
> > ubuntu
> >
> > > threw me in a low resolution mode running their display-config utility.
> > > I could still not change VTs to a console. At this point I restarted
> > > the laptop.
> > >
> > > Should I post any log files?
> > >
> > > By the way, this is a long shot, but I know the uvcvideo module has
> >
> > caused
> >
> > > problems in the past, could it do so again? This is a long shot,
> > > because the only thing changed when I tried the above with the 2.6.24
> > > kernel is updated i915 and drm modules.
> >
> > Well, if console suspend/resume is working, it's probably not a uvcvideo
> > issue, since that would probably prevent the kernel from suspending or
> > resuming altogether.
>
> I'm also 99.9% certain it's not. Just wanted to mention it. And also, it is
> possible that the module wasn't loaded when Isuspended in console (I can
> double check this later if need be). In any event, the suspend script is
> supposed to unload the module before suspend.
>
> > What X driver are you using?
> >
> > Everything else is plain ubuntu hardy: intel version: 2.2.1-1ubuntu13.
> > And
>
> the xorg.conf is just minimal.
> By the way, the logs I caught revealed nothing. I can try to get more
> verbose logs later if that's needed.

What if you suspend w/o using the scripts?  I.e. from X just open an xterm or 
something as root and do 'echo mem > /sys/power/state'?

Jesse