<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#c43">Comment # 43</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:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> Jani Nikula</a> <pre>Thanks. Apparently intel_backlight does what the userspace wants, mechanism not policy and all that, while acpi_backlight, for some reason, did not obey 0 backlight in this scenario. And we moved from acpi_backlight to intel_backlight on your hardware. Technically there's no regression in i915, as it works with a sane userspace, and I'm obviously reluctant to adding hacks in i915 to replicate policy in acpi. However we've changed a few things related to backlight power sequencing and minimum backlight brightness; please see if those help with the old userspace. The branch to try is drm-intel-nightly at <a href="http://cgit.freedesktop.org/drm-intel">http://cgit.freedesktop.org/drm-intel</a>.</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>