Linux 3.x: Flickering when logging into GNOME Shell or Unity

[Paul Menzel]

Am Mittwoch, den 17.10.2012, 16:25 -0400 schrieb Alex Deucher:
> On Wed, Oct 17, 2012 at 11:26 AM, Paul Menzel wrote:

> > Am Mittwoch, den 17.10.2012, 16:49 +0200 schrieb Paul Menzel:
> >
> >> setting up an ASUS M2A-VM after some months with
> >>
> >>         [    3.178337] [drm] initializing kernel modesetting (RS690 0x1002:0x791E 0x1043:0x826D).
> >>
> >> logging in into GNOME Shell (GNOME 3) or for testing with Ubuntu 12.04
> >> and Unity, the image flickers for a second and then works normally.
> >>
> >> Turning on debugging
> >>
> >>         /sys/module/drm/parameters$ echo "0x06" | sudo tee debug
> >>         sudo: unable to resolve host granit
> >>         0x06
> >>
> >> before logging in, the following is logged. Looking at the source code,
> >> I do not see that this is supposed to be a problem. But maybe you can
> >> figure out more.
> >>
> >>         [  454.896408] [drm:drm_mode_addfb], [FB:41]
> >>         [  454.896427] [drm:radeon_crtc_page_flip], flip-ioctl() cur_fbo = ffff880072438400, cur_bbo = ffff880037072400
> >
> > trying Linux 3.5
> >
> >         $ dpkg -l linux-image-3.5* | grep ii | tr -s ' ' | cut -d ' ' -f 2-4
> >         linux-image-3.5-trunk-amd64 3.5.5-1~experimental.1 amd64
> >
> > the flickering is still there.
> 
> I don't see anything wrong in the log.  Does the flicker occur at
> regular intervals or just at start up?

As far as I see, one second after hitting enter in the graphical login
manager (LightDM in this case).

> I suspect the flicker may be due to your desktop environment probing
> for monitors at startup

Hmm. Only a VGA monitor is detected and I do not see that issue on
different system where I tested GNOME Shell to reproduce this. I have
test Unity too again.

Though the probing should be in the logs somehow? But there are not
during the time of login.

> which causes a flicker if nothing is attached to the analog ports
> (VGA, s-video) as that results in a load detection operation to probe
> for old monitors without EDIDs or analog TVs.

Any hint on how to rule that out? Disable some outputs on the command
line or so?


Thanks,

Paul
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