Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1351763

Re: Linux 4.4.4 [regression]

From Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: Linux 4.4.4 [regression]
Date 2016-03-07 17:30 +0100
Message-ID <ra6cG-5dM-13@gated-at.bofh.it> (permalink)
References (1 earlier) <r9i6e-4VN-17@gated-at.bofh.it> <r9ouZ-18t-1@gated-at.bofh.it> <r9GLg-5vs-5@gated-at.bofh.it> <r9S01-4oH-1@gated-at.bofh.it> <ra4ky-3XX-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Mon, Mar 7, 2016 at 6:20 AM, Jörg-Volker Peetz <jvpeetz@web.de> 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?

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.

                        Linus

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: Linux 4.4.4 [regression] Greg KH <gregkh@linuxfoundation.org> - 2016-03-05 18:50 +0100
  Re: Linux 4.4.4 [regression] Jörg-Volker Peetz <jvpeetz@web.de> - 2016-03-06 14:20 +0100
    Re: Linux 4.4.4 [regression] Greg KH <gregkh@linuxfoundation.org> - 2016-03-07 02:20 +0100
      Re: Linux 4.4.4 [regression] Jörg-Volker Peetz <jvpeetz@web.de> - 2016-03-07 15:30 +0100
        Re: Linux 4.4.4 [regression] Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-07 17:30 +0100
          RE: Linux 4.4.4 [regression] "Deucher, Alexander" <Alexander.Deucher@amd.com> - 2016-03-07 18:10 +0100
            RE: Linux 4.4.4 [regression] "Deucher, Alexander" <Alexander.Deucher@amd.com> - 2016-03-07 19:10 +0100

csiph-web