Comment 117 for bug 127101

OK - I've added a blurb to the release notes about the issue. If possible,
sould some people test and make sure the graphical X setting tool can
properly change the driver? I've had some problems with this, but it should
work as it is a showcased feature in Gutsy.

On 10/10/07, Bryce Harrington <email address hidden> wrote:
>
> The release notes are at https://wiki.ubuntu.com/GutsyGibbon/RC. I
> think it's a good suggestion to mention this issue in the Caveats
> section, in a short and constructive manner. Would you mind taking a
> shot at creating an initial draft of the text to go in here?
>
> Given the plan of putting out a release note and fixing this in a post-
> release update, we need to approach this bug a little differently.
> First, we need to focus on finding "regression-free" fixes or
> workarounds. We will have made mention of the issue in the release
> notes, so it would not be good to put out a fix that risks just moving
> the bug to a new, unknown location. Second, I think we need to ensure
> when we apply a fix, we have a deep understanding of *why* it works;
> otherwise, we won't have confidence that we're truly fixing the root
> cause.
>
> I posted about this issue to the xorg@ mailing list last night, to get
> advice. Unfortunately, there's not been very little response.
>
> So far, the best attack angle we have are Juan Pablo's backtraces.
> These give tangible, deep information into the issue, that could
> possibly identify a real solution. I'm going to be focusing on this
> angle. I would encourage others who wish to help solve this issue to
> follow Juan Pablo's approach and try to also gain backtraces like his.
>
> unggnu, thanks for investigating the angle of removing the overlay fix.
> However it sounds like that is more a fix for bug 141063 than this one.
> Also, since presumably removing the fix would result in returning the
> original bug that it fixed, it couldn't be considered regression-free.
>
> Jose, it's quite interesting that enabling EXA seems to reduce the
> frequency of the issue, and that might provide a clue. However, EXA is
> another new technology with its own collection of issues, and given that
> we're dealing with issues from immature code, I don't think it's wise to
> solve it by adding in more immature code without having a deep
> understanding of why it makes it work. Also, if it requires dropping
> patch 120 from xserver, we'll get that regression for XAA users.
>
> Tim, if you can identify which config variable in /etc/gdm/gdm.conf to
> switch, then other users could test that. However, it's hard to change
> gdm behavior without causing a regression somewhere, so this likely
> contains some regression risk as well. But it might be worthwhile to
> identify as a workaround, if we can get several of us to validate it.
>
> --
> laptop hangs when switching video mode
> https://bugs.launchpad.net/bugs/127101
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>