[Bug 91437] New: PSR - screen freezes when sound controller power saving is enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91437

            Bug ID: 91437
           Summary: PSR - screen freezes when sound controller power
                    saving is enabled
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ivan.mitev at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 117313
  --> https://bugs.freedesktop.org/attachment.cgi?id=117313&action=edit
tar.gz with all relevant dmesg and laptop specs

With PSR enabled, FBC=0, laptop undocked (on AC), the screen goes blank in X
(but not in console) when the sound controller power saving is enabled
(/sys/module/snd_hda_intel/parameters/power_save = Y)

(I hit bug 91436 but a suspend-resume cycle allows to continue to work with the
laptop and do further tests)

A- with snd power saving not configured ("N") when switching to battery,
everything's OK. (see folder boot-undocked_ac_fbc0_psr1-hdaN in attached tgz).

B- with snd power saving configured ("Y") when switching to battery, the screen
goes blank when I'm in X, but not when I'm in a console. See folder
boot-undocked_ac_fbc0_psr1-hdaY in attached tgz:

1-boot_freezeatprompt (bug 91436)
2-after_suspendresume_cycle (workaround to get a functional display)
3-bat-on-console-hdaY (switch to battery when in console)
4-ac-console (switch to AC when in console)
5-bat-X-hdaY (switch to battery when in Xorg)
6-suspend_resume_cycle-still_blank (tried suspend/resume workaround but still
blank)
7-movetoconsole_suspendresumecycle-still_blank (switch to console, another
suspend/resume cycle test, but still blank).


Hardware: lenovo T450s, model 20BX000TBM (see attached dmidecode and lspci_vv).
OS: Fedora 22, fully updated (as of 2015-07-23)
Kernel: git drm-intel-nightly (as of 2015-07-22 evening). .config attached
(config.drm-intel).
Xorg:
- xorg-x11-server-Xorg-1.17.2-1.fc22.x86_64
- xorg-x11-drv-intel-2.99.917-12.20150615.fc22.x86_64
- mesa-dri-drivers-10.6.1-1.20150629.fc22.x86_64


(sorry to attach a tar.gz, too many files to attach).

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