> -----Original Message----- > From: linus971@xxxxxxxxx [mailto:linus971@xxxxxxxxx] On Behalf Of Linus > Torvalds > Sent: Monday, March 07, 2016 11:21 AM > To: Jörg-Volker Peetz; Dave Airlie; DRI mailing list > Cc: Greg KH; Linux Kernel Mailing List; Andrew Morton; stable; lwn@xxxxxxx; > Jiri Slaby; Deucher, Alexander > Subject: Re: Linux 4.4.4 [regression] > > On Mon, Mar 7, 2016 at 6:20 AM, Jörg-Volker Peetz <jvpeetz@xxxxxx> > wrote: > > > > This same problem with X does happen in 4.5-rc7. And removing the line > > introduced by patch b36e52c44ce6728824546d8b5f05b844cede96f1 makes > X go again on > > my laptop. > > Ok, so that's dbb17a21c131eca94eb31136eee9a7fe5aff00d9 in mainline. > > Dave, Alex: that commit makes Jörg-Volker's HP Pavilion dv7 with > hybrid graphics (AMD HD 4200 - AMD 5400) unable to run X. No > suspend/resume in sight, just starting X hangs. > > I'd guess it's the "radeon_switcheroo_set_state()" craziness (based on > that hybrid graphics thing), but we need to do something since this is > a regression. > > Just revert for now? Or do you have other suggestions for Jörg-Volker to > test? Can you attach your dmesg output? > > Maybe that call to drm_helper_hpd_irq_event() should be purely in the > real resume path? > > Or maybe there is something that the switcheroo code does that just > interacts badly with the code in drm_helper_hpd_irq_event()? Deadlock > on mode_config.mutex or something? > > I suspect we just need to revert, but if somebody who knows the code > sees some obvious fix, holler quickly, please. Yes, It's probably something related to switcheroo. Does the attached patch help? Alex
Attachment:
0001-drm-radeon-selectively-call-drm_helper_hpd_irq_event.patch
Description: 0001-drm-radeon-selectively-call-drm_helper_hpd_irq_event.patch
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