On Thu, Mar 08, 2007, Linus Torvalds wrote:

On Fri, 9 Mar 2007, Ingo Molnar wrote:

quoted

disabling the following radeonfb options in the .config made resume work 
again:

In general, don't even *try* to use radeonfb for suspend/resume.

I don't think it has ever worked, except on some very rare laptops 
(largely PPC Macs) where people had enough information to set up the 
PLL's.

I don't think the other framebuffer drivers are much better.

You're better off using the VGA console, and lettign X re-initialize the 
graphics device. That generally at least has a reasonably good chance of 
working.

Re-initializing graphics modes really is very hard. You can try with the 
BIOS video hack (I forget the kernel command line to turn it on), but we 
really do end up depending on X doing it better.

acpi_sleep=s3_bios has always worked for me on my ThinkPad T42p.

Even if one doesn't use the fb console at all, radeonfb apparently
is still required on some ThinkPad models to work around BIOS bugs:

http://www.thinkwiki.org/wiki/Problem_with_high_power_drain_in_ACPI_sleep#Radeon_GPU_not_powered_off


Johannes