Bug#608616: Mobility Radeon HD 4200: Black screen after resuming from suspend / no-hibernation
On 2011-01-02 02:09 +0100, Margarita Manterola wrote:
> I'm working with an Asus EeePC 1215T, that comes with a Mobility Radeon HD
> 4200, after installing a fresh squeeze into it, suspend and hibernate
> didn't work properly: suspend worked, but when returning, no video
> returned, hibernation didn't work (black screen but no power off).
>
> 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.
The difference is that the preinst of the Ubuntu package removes the
file /etc/modprobe.d/radeon-kms.conf (it is not needed on Ubuntu,
because Ubuntu kernels are built with KMS enabled), leaving you with UMS
even after you reinstall the Debian package.
The first thing I would do is to test a newer kernel, e.g. 2.6.37-c7
from experimental, and restore the missing file.
> In the logs below, I have removed the messages that were redundant (lines
> and lines of the same FBDEV error).
> The weird "atom" errors that show in the dmesg logs appear when
> hibernating/dehibernating, and are very surprising, taking into account
> this is NOT an Atom netbook.
They refer to the AtomBIOS found in Radeon GPUs.
Cheers,
Sven
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