Hi, I'm having a few problems with i915 on my Broadwell Thinkpad (T450s, i7-5600U) with kernel 3.19, apparently suspend/resume related. During every suspend/resume cycle, I see this in my kernel log after wakeup: PM: Entering mem sleep Suspending console(s) (use no_console_suspend to debug) (three lines cut) [drm:stop_ring] *ERROR* render ring : timed out trying to stop ring I also get a lot of the following at random times, and during glxgears once for every frame presented. I'm assuming it's for every GL frame, but I've only confirmed that for glxgears: [drm:hsw_unclaimed_reg_detect.isra.11 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem. With mmio_debug, I get these: WARNING: CPU: 0 PID: 360 at drivers/gpu/drm/i915/intel_uncore.c:726 hsw_unclaimed_reg_debug+0x7d/0xa0() Unclaimed register detected before writing to register 0x44404 CPU: 0 PID: 360 Comm: Xorg Tainted: G W 3.19.0 #1 Hardware name: LENOVO 20BWS03F00/20BWS03F00, BIOS JBET39WW (1.04 ) 12/09/2014 0000000000000000 0000000070c52c75 ffff88032d8a3b18 ffffffff819f0e8b 0000000000000007 ffff88032d8a3b70 ffff88032d8a3b58 ffffffff810c7205 0000000000000246 ffff88032cd00000 0000000000044404 0000000000044404 Call Trace: [<ffffffff819f0e8b>] dump_stack+0x4c/0x6e [<ffffffff810c7205>] warn_slowpath_common+0x85/0xc0 [<ffffffff810c72c5>] warn_slowpath_fmt+0x55/0x70 [<ffffffff81524d8d>] hsw_unclaimed_reg_debug+0x7d/0xa0 [<ffffffff8152ac48>] gen8_write32+0x58/0x1a0 [<ffffffff8150f55b>] gen8_enable_vblank+0x6b/0xa0 [<ffffffff814bbd2d>] drm_vblank_enable+0x8d/0x100 [<ffffffff814bcb4b>] drm_vblank_get+0xab/0xe0 [<ffffffff814bd442>] drm_wait_vblank+0x92/0x620 [<ffffffff81500d8c>] ? i915_gem_retire_requests_ring+0x3c/0x180 [<ffffffff814bb1af>] drm_ioctl+0x1df/0x680 [<ffffffff8112fb5c>] ? __hrtimer_start_range_ns+0x2fc/0x410 [<ffffffff81225c88>] do_vfs_ioctl+0x2f8/0x500 [<ffffffff812302e2>] ? __fget+0x72/0xb0 [<ffffffff81225f11>] SyS_ioctl+0x81/0xa0 [<ffffffff819f9312>] system_call_fastpath+0x12/0x17 About every one in three suspend/resume cycles, X graphics are almost completely broken after resume. Window decorations are still drawn (mostly, anyway), but window contents are mostly absent. What survived the cycle is killed off entirely by redraw events. Restarting everything X doesn't work, virtual terminals work fine. Also, it seems that running or having run a GL application has some impact on this. With an instance of glxgears running during suspend/resume, this doesn't seem to happen. Moreover, running a GL app seems to fix the problem. Is this known already, or can I somehow help to fix this? Greetings, Phoebe _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
