[ltp] [SOLVED]T40 ACPI and radeon. Thank you.

[Johannes Wolter]

On Saturday 29 January 2005 21:24, Bob Alexander wrote:
> Johannes Wolter wrote:
> > I've a X31 (26721LG) with a Radeon (M6) and experience the same power
> > drain problems in the ACPI S3 state. I read a lot about the radeon
> > patch(es), changing the DRAM to D2 state, which can be harmful on some
> > hardware. Did anybody try this patches successfully on a X31, because I
> > only read reports about tests with a T4*.
>
> Could you explain the "can be harmful on some hardware" part ?

I first read about the radeon-patch in a the kernel bugzilla. There Benjamin 
Herrenschmidt (maintains a PPC kernel tree) told, that the D2 stage for the 
RAM on the video card is only tested on PPC and (normally) shouldn't be set 
on i386 machines[1].
They started a whitelist of models, on which the new patch is tested. But I 
never read, that someone tested it on a X31.

Cheers,
Johannes

[1]: http://bugme.osdl.org/show_bug.cgi?id=3022#c29