ubuntu-x-swat team mailing list archive

[Bryce Harrington <787587@xxxxxxxxxxxxxxxxxx>]

@Chris Van Hoof, looks like Dell omitted this 1024x576 resolution in the
EDID they're providing with this hardware model.  Is that something one
of your kernel guys could easily quirk in?  Then it'd work without all
this cvt madness.

@John, Regarding why the --addmode is resulting in a black screen, I
don't know.  Best guess is something changed in the kernel modesetting
support.  If this is true then booting the maverick kernel should make
cvt work as before.  If it doesn't, then there may indeed have been some
other change in X or -intel.

I would suggest turning on KMS debugging (install xdiagnose and run
'sudo xdiagnose' to bring up the GUI, then turn on modesetting debugging
- it's the first checkbox in the dialog).  Reboot, repeat the bug
resulting in the black screen, then ssh into the broken machine and
collect 'dmesg' output and post here.  Theoretically that should tell us
what the kernel is trying to do.

Also, presuming you find that with the maverick kernel you don't get the
black screen, the next step would be to test out some of the
intermediate kernels between .35 and .38 to narrow down when the fix
went in.  Builds of these kernels are available at
http://kernel.ubuntu.com/~kernel-ppa/mainline/.  I'd start by testing
each of the -rc1 kernels and the newest point release in each series
(e.g. .36-rc1, .36.4, .37-rc1, .37.6, etc.)  You're looking for a
pattern where the -rc1 does not work but the .N does; once you have
that, then find the kernel within that series where the fix first
appears.

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https://bugs.launchpad.net/bugs/787587

Title:
  Cannot change screen resolution on Dell Duo in Natty