Bug 21682

Created attachment 25735 [details]
16bit.jpg

Hardware accelerated compiz with 16 bit colour depth

Created attachment 25736 [details]
My desktop in tis normal state

Created attachment 25737 [details]
Xorg.0.log

Created attachment 25738 [details]
xorg.conf

Created attachment 25739 [details]
hwinfo --gfxcard

You can't use compiz in 16bpp or without hardware acceleration. 24bpp and hardware acceleration are requirements.

(In reply to comment #6)
> You can't use compiz in 16bpp or without hardware acceleration. 24bpp and
> hardware acceleration are requirements.
> 

Understood, but it's not an acceptable behaviour that it starts wihout a single warning message (and it's even working hard to do something :), rendering the whole desktop unusable. It shouldn't start at all.

(In reply to comment #6)
> You can't use compiz in 16bpp or without hardware acceleration. 24bpp and
> hardware acceleration are requirements.

Huh? The white screen of death with software rendering is just a known longstanding bug which is pretty low priority to fix, as compiz likely wouldn't be usable anyway like that, but there is certainly no requirement for depth 24.

Likely a driver bug, most likely Mesa.

Does this also occur with DRI2?

(In reply to comment #10)
> Does this also occur with DRI2?
> 

Yes, but only if I use 16bpp instead of 24bpp (read #1). (This is compiz 0.7.8, I haven't tried 0.8.2 yet.)

I read #1, and #1-#5 all show DRI1 in use, not DRI2.  Could you attach a Xorg.0.log from reproducing the problem with DRI2?

(In reply to comment #12)
> I read #1, and #1-#5 all show DRI1 in use, not DRI2.  Could you attach a
> Xorg.0.log from reproducing the problem with DRI2?
> 

OK, I installed openSUSE 11.2 MI8, now I'm able to try to reproduce it with DRI2, but I don't know how to change to 16bpp, because there is no /etc/X11/xorg.conf. Is there a way to create /etc/X11/xorg.conf with the current running parameters of X.org (i.e. extracting the "running config" from the running X server in xorg.conf format)? Or do I have to alter bpp in another way?

(In reply to comment #13)
> (In reply to comment #12)
> > I read #1, and #1-#5 all show DRI1 in use, not DRI2.  Could you attach a
> > Xorg.0.log from reproducing the problem with DRI2?
> > 
> 
> OK, I installed openSUSE 11.2 MI8, now I'm able to try to reproduce it with
> DRI2, but I don't know how to change to 16bpp, because there is no
> /etc/X11/xorg.conf. Is there a way to create /etc/X11/xorg.conf with the
> current running parameters of X.org (i.e. extracting the "running config" from
> the running X server in xorg.conf format)? Or do I have to alter bpp in another
> way?

Assuming you're using xdm (/etc/sysconfig/displaymanager:DISPLAYMANAGER=xdm) the easiest would be to add 'depth 16' to the Xserver options list in /etc/X11/xdm/Xservers. Not sure whether intel is already a DRI2 capable driver on 
openSUSE 11.2.

Tamás is already using openSUSE 11.3, which ships xorg-server 1.8 and therefore includes DRI2.

(In reply to comment #15)
> Tamás is already using openSUSE 11.3, which ships xorg-server 1.8 and therefore
> includes DRI2.

In fact I still have a netbook with openSUSE 11.2 but compiz ceased to work on it. I assume I will have to update it to opesSUSE 11.3. Can I do anything for you given that I only have 11.3 (also including a disfunctional compiz: https://bugzilla.novell.com/show_bug.cgi?id=641596) now?

Tamás, looks like you resolved your issues with compiz on openSUSE 11.3. So can you finally verify whether the issue with 16bpp color depth still exists with a DRI2 capable driver?

Tamas, any news on that one?

(In reply to comment #18)
> Tamas, any news on that one?

I just tried it on openSUSE 11.4. Compiz 0.9.x is practically unusable (it crashes in half a minute after starting), however I was able to recognize that the white screen problem is gone in 16bpp but now the color palette of windows totally went wrong and the windows are displayed scaled down four times and every window is composed four of its scaled down image ad then tiled together. Totally unusable. Rendering is correct at higher color depth but as I mentioned earlier, compiz always crashes in half a minute after starting.

I still have an openSUSE 11.3 machine. Should I try that too?

(In reply to comment #19)
> I still have an openSUSE 11.3 machine. Should I try that too?

That would be great, yes.

Created attachment 45041 [details]
My normal openSUSE 11.3 desktop (24bpp)

Created attachment 45042 [details]
My openSUSE 11.3 desktop distorted at 16bpp

(In reply to comment #20)
> (In reply to comment #19)
> > I still have an openSUSE 11.3 machine. Should I try that too?
> 
> That would be great, yes.

Sadly, openSUSE 11.3 virtually behaves the same way as 11.4.

(See my two attachments.)

Too old, still valid for latest SW?? Thank you.

compiz is no longer been shipped by any still supported Linux distribution I guess. Also 945GM were still 32 bit machines. Probably no longer been used by anyone. Let's better close this one as WONTFIX.