Bug#608616: Mobility Radeon HD 4200: Black screen after resuming from suspend / no-hibernation
Hola Michel Dänzer!
> > After installing the xserver driver from maverick (1:6.13.1-1ubuntu5), both
> > started working properly. So it seems that there's a difference in the
> > patches applied in one and the other that makes suspension/hibernation work
> > with one and not the other.
>
> Let me get this straight: With the Debian driver package installed,
> suspend/hibernation doesn't work no matter which kernel etc. you're
> using. With the Ubuntu driver package installed, both work. And these
> symptoms remain the same after switching back and forth between the
> versions of the driver package. Did I get that right?
No, no. Only switching back and forth between kernels. I never tried
downgrading the X driver back to squeeze's.
I could try that, my guess is that it's a code change and so it won't work,
but I'll try it just to document it.
> > After looking at the changelogs and differences between the two packages, I
> > have the sensation that the problem might be related to kms, but I really
> > don't know enough about X to debug this myself.
>
> KMS should be enabled by default in both cases, so colour me skeptical.
> But you can try flipping it with the radeon kernel module parameter
> 'modeset' to see if it makes any difference in either case.
>
> Otherwise, apart from any possible code differences between the driver
> package versions (haven't checked yet),
I was refering to code differences regarding kms. I did read the
changes, and there were differences regarding kms in the code, that's
why I suggested that there might be a problem there.
> I assume that switching between
> them also requires switching versions of other packages, in particular
> xserver-xorg-core. The difference might actually be there. E.g. it might
> be interesting rebuilding the Debian driver package against the Ubuntu X
> server and vice versa and seeing what happens in each case.
Uhmm... Not -core. I did install xserver-xorg from maverick, although I'm
not sure if it ships any interesting files.
The machine is not mine and I'll have limited access to it after today,
which was why I tried to get help debugging this on IRC as quickly as
possible, but unfortunately couldn't get it.
Anyway, I'll do as much testing as I can before having to give it up, and
then my response time about this bug is going to be much slower.
--
Love,
Marga
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