[Openchrome-users] 3D -> laptop freezes - K8M800 (ubuntu dapper - acer 1362)

[Benno Schulenberg]

Jean-Patrick Pommier wrote:
> How can I be sure that the computer is using the newly build
> driver?

Remove the old one.  Or move it to where X won't find it, to the 
homedir of root, for example.

> If the build driver is buggy, is there some news 
> regarding a possible fixing of that bug ?

Thomas said that the unichrome part of Mesa is unmaintained.  :(

> (can I fix the problem 
> myself by compiling something : latest mesa, kernel ...?)

The problem lies in Mesa, that's the thing handling textures.  
Lately there was some talk of some texture stuff being broken:

https://bugs.freedesktop.org/show_bug.cgi?id=6814

See comment #30.

That same day Keith Whitwell posted a patch to mesa3d-dev that 
should fix... something.  The post isn't in the archives yet, they 
appear to stop at May 4th, so I can't link to it.  And I don't know 
if this fix made it into CVS already.  You could pull the most 
recent CVS and see if the fragment below has been applied; if so, 
the rest will have been too.  Then compile and install and see if it 
makes a difference.

diff -u -r1.35 via_ioctl.c
--- drivers/dri/unichrome/via_ioctl.c   16 Nov 2005 17:24:26 -0000      
1.35
+++ drivers/dri/unichrome/via_ioctl.c   5 May 2006 09:25:27 -0000
@@ -233,7 +233,7 @@
     
    if (mask & BUFFER_BIT_STENCIL) {
       if (vmesa->have_hw_stencil) {
-        if (ctx->Stencil.WriteMask[0] == 0xff) {
+        if ((ctx->Stencil.WriteMask[0] & 0xff) == 0xff) {
            flag |= VIA_DEPTH;
            clear_depth &= ~0xff;
            clear_depth |= (ctx->Stencil.Clear & 0xff);

Benno