On Pá 06-01-06 06:34:14, Tom Marshall wrote: > > > I have a firewire controller in a desktop system, and a ATI Radeon in a > > > T42 that support D1 and D2.. > > > > Ok, now we have a concrete example. So Radeon supports D1. But putting > > radeon into D1 means you probably want to blank your screen and turn > > the backlight off; that takes *long* time anyway. So you can simply > > put your radeon into D3 and save a bit more power. > > > > So yes, Radeon supports D1, but we probably do not want to use it. > > I understand this is a theoretical argument. However, in reality, a > significant number of T42 owners get less than 12 hours of battery life in > S3 suspend because the Radeon chip sucks a huge amount of power with the > current code. We would be eternally grateful if someone could figure out > why only some models are affected and, more importantly, submit a patch that > will reliably enter D2 (or D3 if it is supported?) for all Radeon 7500 > chips. I've found a couple patches that were submitted to this list but, > for whatever reason, nobody seems to have found a solution that is > acceptable yet. I've been manually patching my kernels with code to enter > D2 for the last year or so, and from the volume of google results, it looks > like quite a lot of other folks are doing the same... :( We were talking runtime pm here. Pavel -- Thanks, Sharp!
