Current git: Xorg display corruption with radeon driver (bisected)
Submitted by Andre Tomt
Assigned to Carl Worth
Created attachment 54380 screenshot
With cairo from git master display frequently corrupts, especially text labels, when used with the xorg radeon driver. This seems to be related to EXA acceleration, as setting NoAccel in xorg.conf or using intel HD graphics (which is not using EXA) makes things nice again.
I am not sure if this is an xorg, driver or cairo bug however. All I know is that a commit in cairo made it a problem (see bisected commit below).
Steps to reproduce on Ubuntu 11.10: A graphics card using a XAA using driver seems to be needed. I've seen corruption on Radeon HD4780, HD5450, HD5770 and HD6670. Xorg can be 1.10 or 1.11-git, doesn't seem to matter.
Install cairo from git. It is also in xorg-edgers ppa (package repository) for the lazy: add xorg-edgers ppa: apt-add-repository ppa:xorg-edgers/ppa apt-get update && apt-get dist-upgrade (note that this also pulls in mesa and xorg bits)
Chromium seems to be able to trigger this easily, so its a good app to test with. install chromium: apt-get install chromium-browser
Make bookmark toolbar visible, create a couple bookmarks in it. Now hover mouse a few times over the bookmark in the bar, it corrupts usually within a couple hovers.
A redraw of the window, by for example giving window focus clears out the corruption until it happens again.
Bisecting shows it starts happing with:
Introduce a new compositor architecture Having spent the last dev cycle looking at how we could specialize the compositors for various backends, we once again look for the commonalities in order to reduce the duplication. In part this is motivated by the idea that spans is a good interface for both the existent GL backend and pixman, and so they deserve a dedicated compositor. xcb/xlib target an identical rendering system and so they should be using the same compositor, and it should be possible to run that same compositor locally against pixman to generate reference tests. Signed-off-by: Chris Wilson <email@example.com> P.S. This brings massive upheaval (read breakage) I've tried delaying in order to fix as many things as possible but now this one patch does far, far, far too much. Apologies in advance for breaking your favourite backend, but trust me in that the end result will be much better. :)
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