Thinkpad R40 Followup ACPI/APM/AGP under 5.1

[Michael Collette]

I went and jumped in with both feet into 5.1-CURRENT here with this Thinkpad 
R40 in the hopes that I could get the power management working.  Some 
interesting, if not mixed results.

ACPI is evil, and must be turned very very off on this thing.  I guess I need 
to figure out how to make that the default login at some point.  Not all that 
concerned about that just yet.

With ACPI all turned off, APM seems to be working quite nicely.  Well, from 
the console anyway.  Many thanks to Darryl Okahata's extremely helpful post 
to this list last week.  I can now put this box to sleep as well as wake it 
back up again.  I looks like 5.1 takes a little extra time to go to sleep, 
which is just fine by me.  Sync them disk writes!

Ahh, then there's trying to do the suspend thing from within X.  It goes to 
sleep just fine.  It even wakes up mostly okay.  What it doesn't do is tell 
the video card to start displaying the GUI again.  This is true even with 
applying Tobias Roth's suggested changes to rc.suspend and rc.resume.

To bring X back I need to force a switch to any console with Ctrl-Alt-Fx then 
put the screen in standby with Fn-F3 followed by a tap on Fn to wake it up 
from standby.  Alt-F9 returns me back to an unharmed X display.

Are there any other suggestions for telling that darn video card to wake the 
heck up without having to toggle around in a circle like this?


The other oddity here is that "device agp" really does not get along with this 
ATI Radeon 7500.  Having it on causes X to core dump upon starting.  Pulling 
it out of the kernel corrects the problem.  Not a big deal as X seems to work 
very nicely otherwise.  I only mention it out of curiosity.  I was also kind 
of interested in the radeondrm kernel option.


All in all things at least feel like they're moving in the right direction for 
me with 5.1.  I never even came close to getting 4.8 to not totally crash 
upon going into suspend mode.  The agp thing didn't work in 4.8 either.

BTW, is there any value in crossposting write ups like this to the CURRENT 
mailing list?

Later on,
-- 
"Always listen to experts.  They'll tell you what can't be done, and why.  
Then do it."
- Robert A. Heinlein