<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend" href="https://bugs.freedesktop.org/show_bug.cgi?id=89589#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend" href="https://bugs.freedesktop.org/show_bug.cgi?id=89589">bug 89589</a> from <a class="email" href="mailto:chrissalzberg@gmail.com" title="Chris Salzberg <chrissalzberg@gmail.com>"> Chris Salzberg</a> <pre>Just another "me too". I see this with two monitors (DP1-1 & DP1-2) attached via mdp + laptop (eDP1). My kernel: 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET 2015 x86_64 GNU/Linux When I resume from sleep the laptop monitor comes on but the other two do not. If I turn off one of them the other comes back, and then I can turn the other one on. But I've found the state then to be unstable and the system can freeze suddenly so I tend just not to put it to sleep with both monitors attached. Not sure if it's related but I see this flagged in journalctl: drm:intel_mst_pre_enable_dp [i915]] *ERROR* failed to allocate vcpi drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for ACT sent drm:intel_mst_pre_enable_dp [i915]] *ERROR* failed to allocate vcpi drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for ACT sent -----------[ cut here ]------------ ARNING: CPU: 2 PID: 18078 at drivers/gpu/drm/i915/intel_display.c:6380 intel_modeset_check_stat rong connector dpms state odules linked in: rfcomm ctr ccm fuse xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 iptabl snd_soc_rt5640 cfg80211 hid_generic snd_soc_rl6231 bluetooth hid_logitech_dj media snd_soc_core aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd ahci libahci libata ehci_pci xhci_pci sc PU: 2 PID: 18078 Comm: kworker/u16:92 Not tainted 4.2.5-1-ARCH #1 ardware name: Dell Inc. XPS13 9333/0D13CR, BIOS A05 09/11/2014</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>