Bug#664578: xserver-xorg-video-radeon: Screen/memory corruption with RS690M (X1200) when scrolling in applications

[Michel Dänzer]

On Mon, 2012-03-19 at 01:01 +0100, Josselin Mouette wrote: 
> 
> I’ve experienced screen corruption on my RS690M for quite a while; I 
> should have reported that earlier, but waited for new versions of the 
> driver; and while the symptoms have been evolving with the driver 
> version, the main problem is still here.
> 
> Frequently, when I scroll in some applications (like nautilus or 
> epiphany), the screen becomes completely garbled. It seems to happen 
> when scrolling with the wheel in applications that are slow to redraw 
> (maybe when a redraw is triggered when the previous one is not 
> complete); this never happens when scrolling in evolution, xchat, 
> empathy or terminal windows, which are very fast to render, for example. 
> This doesn’t happen when scrolling slowly, waiting between each 
> keypress, either.
> 
> Parts of the screen get better while being redrawn, but switching 
> workspaces is not enough. Things like the desktop or the panel 
> background remain garbled until I kill the nautilus/gnome-panel 
> processes. Often, some font glyphs are garbled too, and all instances of 
> a given glyph for a given font/color/size combination remain garbled the 
> same for a while.

[...]

> [   20.683347] [drm] Detected VRAM RAM=384M, BAR=256M

Looks like https://bugs.freedesktop.org/show_bug.cgi?id=35457 .
Apparently there's something wrong with the way we deal with Sideport
memory.


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer