Public bug reported: Display power well can cause issues like blank screen when logging in after resume from suspend, so it's best to disable it for now like upstream did in v4.4-rc1:
commit 1b0e3a049efe471c399674fd954500ce97438d30 Author: Imre Deak <[email protected]> Date: Thu Nov 5 23:04:11 2015 +0200 drm/i915/skl: disable display side power well support for now The display power well support on this platform is in a somewhat broken state atm, so disable it by default. This in effect will get rid of incorrect assert WARNs about the CSR/DMC firmware not being loaded during power well toggling. It also removes a problem during driver loading where a register is accessed while its backing power well is down, resulting in another WARN. Until we come up with the root cause of the second problem and the proper fix for both issues, keep all display side power wells on. Also clarify a bit the option description. Reported-by: Dave Airlie <[email protected]> Reference: http://mid.gmane.org/CAPM=9tyjbqjsbtka49crr6sykpnw7pq-fufznzz8y1snvvk...@mail.gmail.com Signed-off-by: Imre Deak <[email protected]> Reviewed-by: Ville Syrjälä <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Jani Nikula <[email protected]> ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Timo Aaltonen (tjaalton) Status: Triaged ** Affects: linux (Ubuntu Vivid) Importance: Undecided Status: Triaged ** Affects: linux (Ubuntu Wily) Importance: Undecided Status: Triaged ** Also affects: linux (Ubuntu Wily) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Vivid) Importance: Undecided Status: New ** Changed in: linux (Ubuntu) Status: New => Triaged ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Timo Aaltonen (tjaalton) ** Changed in: linux (Ubuntu Vivid) Status: New => Triaged ** Changed in: linux (Ubuntu Wily) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1526220 Title: [SKL] Disable display power well To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1526220/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
