Rafael J. Wysocki wrote: > On Thursday 04 February 2010, Zhenyu Wang wrote: > >> On 2010.02.03 23:44:41 +0100, Rafael J. Wysocki wrote: >> >>> On Wednesday 03 February 2010, Alan Jenkins wrote: >>> >>>> Hi >>>> >>>> I found this regression on my EeePC 701 with modesetting enabled. When >>>> I hibernate using s2disk, I can abort the hibernation by pressing the >>>> backspace key. Doing so breaks X on 2.6.32-rc6 (but not 2.6.32). >>>> >>> Yeah. >>> >>> To be honest, I knew that's going to happen, but didn't have the time to take >>> care of it. >>> >>> The problem is that i915 does literally _nothing_ in its .thaw() callback, >>> although it should at least reverse whatever .freeze() did to the hardware >>> (and memory allocations and so on), so that the adapter is functional >>> after creating the image. >>> >>> Fixing this requires some thought, though, because at the moment .freeze() >>> thinks it's .suspend(), which is not the case as this report clearly shows. >>> So, in fact i915_pci_suspend() has to be split into the .freeze() part and >>> the poweroff part cleanly and that's not so simple (at least to me). >>> >>> >> Right, I think that'll be more clean, stuff in i915_save/restore_state() need >> to be splited too, especially isolate stuff for mode setting and other device >> state, as what my original purpose for this is to remove extra mode setting >> cycle in old behavior so not waste time for hibernate. >> > > We can't really do that, because we'll need to restore the saved state at the > resume-from-hibernation stage. > > The appended patch fixes the issue for me, although it's been only tested > a little. It sort of defeats the purpose of commit > cbda12d77ea590082edb6d30bd342a67ebc459e0, but I don't see any less invasive > way to fix this except maybe for reverting that commit entirely. > > Note that the drm_irq_[un]install() thing may be unnecessary, but I wasn't sure > about that and surely wouldn't suggest doing that for 2.6.33. Also it looks like > some things from the freeze and thaw parts may be moved to the "low-level" > suspend and resume parts, respectively, but that would require some > i915_gem_* surgery I was too scared to do. > > Alan, please test, i915 guys, please review. > > Rafael > The patch works very nicely on my eeepc. Thanks (and thanks again for all your hard work this cycle, and specifically for pointing me to the s2disk hang-fix) Alan _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
