<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [IVB regression] screen not resuming on kernel 3.14.6 and above" href="https://bugs.freedesktop.org/show_bug.cgi?id=80182#c36">Comment # 36</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [IVB regression] screen not resuming on kernel 3.14.6 and above" href="https://bugs.freedesktop.org/show_bug.cgi?id=80182">bug 80182</a> from <a class="email" href="mailto:jwrdegoede@fedoraproject.org" title="Hans de Goede <jwrdegoede@fedoraproject.org>"> Hans de Goede</a> <pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=80182#c35">comment #35</a>) > Indeed the logs have plenty of > > [ 873.096139] [drm:intel_backlight_device_update_status], updating > intel_backlight, brightness=0/4437 > > indicating userspace wishing to dim the backlight. Hmm, so this may not be a kernel bug at all. Actually with this info, this sounds a lot like an xf86-video-intel bug which I fixed a while back, specifically see: <a href="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=b545e10c50cbb2dd6f9fd53369667bed0d8f1b51">http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=b545e10c50cbb2dd6f9fd53369667bed0d8f1b51</a> Without that commit when userspace does a dpms off and then a read/modify/write of the backlight level things may end up with a backlight level of 0. Also possibly relevant is: <a href="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=c6cd10f536e099277cdc46643725a5a50ea8b525">http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=c6cd10f536e099277cdc46643725a5a50ea8b525</a> And then specifically this bit: @@ -820,6 +949,14 @@ sna_crtc_apply(xf86CrtcPtr crtc) for (i = 0; i < config->num_output; i++) { xf86OutputPtr output = config->output[i]; + /* Make sure we mark the output as off (and save the backlight) + * before the kernel turns it off due to changing the pipe. + * This is necessary as the kernel may turn off the backlight + * and we lose track of the user settings. + */ + if (output->crtc == NULL) + output->funcs->dpms(output, DPMSModeOff); + if (output->crtc != crtc) continue; Marian, can you please try upgrading your intel driver to the 2.99.916 release ? (you can download the tarbal and build it from source), and please make sure you're using sna and not uxa.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>