Setting the kernel parameter intel_iommu = off was the first attempt to solve the problem.
The error also occurs without this kernel parameter -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libdrm in Ubuntu. https://bugs.launchpad.net/bugs/1756998 Title: GPU HANG: ecode 9:0:0x84dfbffc, in Xorg [1250], reason: Hang on rcs0, action: reset drm/i915: Resetting chip after gpu hang RC6 on Status in libdrm package in Ubuntu: New Status in mesa package in Ubuntu: New Bug description: This error message is in syslog when the Desktop freeze before the Display goes black and the login screen came up. This apparently happens without any apparent connection. Sometimes not for days even though the CPU is 100% full all the time, then again after 20-30 minutes several times in a row. lsb_release -rd Description: Ubuntu 16.04.4 LTS Release: 16.04 mesa 17.2.8-0ubuntu0~16.04.1 libdrm 2.4.83-1~16.04.1 Mar 19 20:12:22 michael-ThinkPad-E470 kernel: [255789.072708] [drm] GPU HANG: ecode 9:0:0x84dfbffc, in Xorg [1250], reason: Hang on rcs0, action: reset Mar 19 20:12:22 michael-ThinkPad-E470 kernel: [255789.072763] drm/i915: Resetting chip after gpu hang Mar 19 20:12:22 michael-ThinkPad-E470 kernel: [255789.073059] [drm] RC6 on Mar 19 20:12:30 michael-ThinkPad-E470 kernel: [255797.047275] drm/i915: Resetting chip after gpu hang Mar 19 20:12:30 michael-ThinkPad-E470 kernel: [255797.047556] [drm] RC6 on Mar 19 20:12:43 michael-ThinkPad-E470 kernel: [255810.039289] drm/i915: Resetting chip after gpu hang Mar 19 20:12:43 michael-ThinkPad-E470 kernel: [255810.039429] [drm] RC6 on Mar 19 20:12:55 michael-ThinkPad-E470 kernel: [255822.007247] drm/i915: Resetting chip after gpu hang Mar 19 20:12:55 michael-ThinkPad-E470 kernel: [255822.007407] [drm] RC6 on Mar 19 20:13:03 michael-ThinkPad-E470 kernel: [255830.071164] drm/i915: Resetting chip after gpu hang Mar 19 20:13:03 michael-ThinkPad-E470 kernel: [255830.071304] [drm] RC6 on Mar 19 20:13:25 michael-ThinkPad-E470 gnome-session-binary[31279]: Entering running state To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1756998/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
