[Bug 36005] Screen flicker approx. every 30 seconds

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Apr 5 15:02:24 PDT 2011


--- Comment #4 from Bryce Harrington <bryce at canonical.com> 2011-04-05 15:02:22 PDT ---
Several other people claim to have the same issue.  All remark that they did
not have the issue on maverick but have on natty.  Of those, several have
tested with turning KMS off via radeon.modeset=0 and found that made the
flickering go away, but led to some other issues.

One of these other people adds these test findings:

Silvio-frishi on 3/26:
I have the same problem on natty64 with VGA video projectors.

I tested it with two computers with two different drivers (xf86-video-ati,
I tested it with three different video projector.
I tested it with three different VGA cables.
I tested it with kernels 2.6.35, 2.6.37, 2.6.38
I tested it with libdrm(i.e. libkms) 2.4.21, 2.4.23 (remark here i didn't

And it always flickered (with exception 3. projector see below).

Remark with two of three projectors I used addmode since the drivers didn't
recognize the native resolution of the beamer.

Everything always worked well if I used my old Gentoo (2.6.33 - but with
KMS,ati and with addmode)

With the 3. projector in natty it worked properly because it recognized the
native resolution. But if I
added an other resolution to it and changed to that it flickered again.

so it's possible It has some thing to do with --addmode

I think this worked on Maverik but I'm not sure since I didn't use --addmode

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