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[Brian Visel <aeon.descriptor@xxxxxxxxx>]

I'm pretty sure that Psycho and Rainer have the same problem I do, and
that it's the problem Cutler had.

First:  I've upgraded from 9.10 to 10.04 beta.  My system updates are current.
  I have a radeon rs690m (x1200)

This is the problem I ran into:
Small, horizontal white lines that appear a bit like static.  Not very noticeable.
Medium and large horizontal lines / areas of corruption.
  * Stripes are often screen-wide
  * Stripes can be scrolled, e.g., in Firefox or Nautilus.
  * Refresh of graphical object clears up corruption -- E.g., a mouseover of a link or highlighting an icon
Mouse Pointer gets corrupted at some points, until refreshed (e.g., when the cursor changes from pointer to question mark, or to a hand, or from hand to arrow, etc.).
  * Corruption occurs regardless of whether or not Desktop Effects are enabled (important later)

I don't know if this is the same issue that cutter is having, and
without feedback from Cutter, I won't.  But, I would like to see this
bug resolved before the release.

Resolution (ish):
In /etc/modprobe.d/radeon-kms.conf, I set:
 options radeon modeset=0

Why just "ish"?
  * Logging into an account created when the system was 9.10 fails, at best booting me back to the login screen. 
  * Logging into an account created since the system has been upgraded to 10.04 works fine, desktop effects and all, no graphics glitches.
  * Logging into the 9.10-made account with desktop effects disabled works fine.
  * Enabling desktop effects once logged in makes the system visually unusable -- cannot switch to console, graphical screen unresponsive except for mouse.

Note that although there were glitches graphically, desktop effects or
not, the system worked with desktop effects enabled when kms was
enabled.

I think there are probably two problems here:
1) KMS causing or making visible some kind of horrible memory badness that I don't understand
2) Desktop Effects config in 9.10 can be set to a state that doesn't play nicely in 10.04 with KMS disabled.

Any further information I will be happy to provide.  I have a workable
system, but I want to make sure others aren't affected problematically.

-Brian

-- 
[RS690] [X1200] graphic glitches (medium horizontal lines) when KMS on [KMS]
https://bugs.launchpad.net/bugs/530725
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