Radeon video corruption when switching to / from VT

[Alex Deucher]

On Mon, Apr 28, 2008 at 4:11 AM, Daniel Kasak <dan at entropy.homelinux.org> wrote:
> Hi all.
>
>  On my Radeon ( X700 Mobility ), I get a corrupted display about 50% of
>  the time when switching to / from a VT. When it happens, I'll sometimes
>  get a coloured ( often green ) display that fades towards white over a
>  couple of seconds ( very strange effect ), or other times I'll get a
>  static display with some rectangles and semi-random looking corruption,
>  in a grey colour.
>
>  To recover, I can switch to a console ( if I'm in X ), or switch to X
>  ( if I'm at a console ). This will *usually* fix it.
>
>  It's not a recent commit that did this. It's been happening for as long
>  as I've had this laptop.
>
>  Nothing appears in my dmesg output. Also nothing of note appears in my
>  X log, but I'm attaching it here anyway. This particular log is from a
>  session that gave me a corrupted display when restoring from
>  hibernation ... a couple of times ( ie each time I restored from
>  hiberation ).
>
>  Since there's nothing useful in this log, what can I do to gather more
>  info on what's going on?

Sounds like an issue with the LVDS power sequence.  suspend/resume can
be problematic however.  Is the problem just with suspend/resume or
any VT switch?

Alex