Deucher, Alexander wrote on 03/07/16 17:44: >> -----Original Message----- >> From: linus971@gmail.com [mailto:linus971@gmail.com] 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@lwn.net; >> Jiri Slaby; Deucher, Alexander >> Subject: Re: Linux 4.4.4 [regression] >> >> On Mon, Mar 7, 2016 at 6:20 AM, Jörg-Volker Peetz >> 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? > I append the dmesg output from 4.5-rc7 (as vacuous as it is) and from my running system with 4.4.4 without the problematic code line. Will try your attached patch next. Regards, jvp.