Created attachment 117313 [details] 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).
note: there's a chance that this bug is related to two other bugs (bug 91436 and bug 91438) that I found when trying to debug flickering with Rodrigo Vivi when PSR was enabled.
Created attachment 117818 [details] [review] patch to mask lpsp back again Hi Ivan, could you please confirm this patch fixes this issue? Thanks
note: tested with branch psr-delayed-enable (as of 2015-08-21) but bug 91436 prevents from doing additional tests (no way to "unfreeze" the screen and to test if powering down the audio controller makes the screen freeze again).
I also believe you wont see this on display-pm-rework branch... Please let me know.
PSR is not dependent anymore from audio driver in our main dev branch (drm-intel-nightly). If you see any issue it is still the same as 91436. So closing this for now. *** This bug has been marked as a duplicate of bug 91436 ***
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