Created attachment 127968 [details] contents of /sys/class/drm/card0/error Nov 14 22:02:50 zephyr kernel: [42515.310739] ------------[ cut here ]------------ Nov 14 22:02:50 zephyr kernel: [42515.310747] WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/i915/intel_lrc.c:506 execlists_check_remove_request+0x5e/0x120 Nov 14 22:02:50 zephyr kernel: [42515.310747] WARN_ON(!head_req || (head_req->ctx_hw_id != ctx_id)) Nov 14 22:02:50 zephyr kernel: [42515.310750] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.8.6-zephyr #20 Nov 14 22:02:50 zephyr kernel: [42515.310751] Hardware name: LENOVO 20BSCTO1WW/20BSCTO1WW, BIOS N14ET32W (1.10 ) 08/13/2015 Nov 14 22:02:50 zephyr kernel: [42515.310752] 0000000000000000 ffffffff813e49c8 ffff88024dc03e20 0000000000000000 Nov 14 22:02:50 zephyr kernel: [42515.310755] ffffffff8110b07f ffff880243643b38 ffff88024dc03e70 ffff88024dc03ea8 Nov 14 22:02:50 zephyr kernel: [42515.310758] 0000000000000008 0000000000000000 ffff88024dc03ea8 ffffffff8110b0ea Nov 14 22:02:50 zephyr kernel: [42515.310761] Call Trace: Nov 14 22:02:50 zephyr kernel: [42515.310761] <IRQ> [<ffffffff813e49c8>] ? dump_stack+0x46/0x5e Nov 14 22:02:50 zephyr kernel: [42515.310769] [<ffffffff8110b07f>] ? __warn+0xaf/0xd0 Nov 14 22:02:50 zephyr kernel: [42515.310771] [<ffffffff8110b0ea>] ? warn_slowpath_fmt+0x4a/0x50 Nov 14 22:02:50 zephyr kernel: [42515.310773] [<ffffffff8153cd4e>] ? execlists_check_remove_request+0x5e/0x120 Nov 14 22:02:50 zephyr kernel: [42515.310774] [<ffffffff8153d8f6>] ? intel_lrc_irq_handler+0x166/0x270 Nov 14 22:02:50 zephyr kernel: [42515.310777] [<ffffffff8110eb7b>] ? tasklet_action+0x4b/0xa0 Nov 14 22:02:50 zephyr kernel: [42515.310779] [<ffffffff8110ef07>] ? __do_softirq+0xf7/0x200 Nov 14 22:02:50 zephyr kernel: [42515.310781] [<ffffffff8110f140>] ? irq_exit+0x90/0xa0 Nov 14 22:02:50 zephyr kernel: [42515.310784] [<ffffffff8105a5ba>] ? do_IRQ+0x4a/0xc0 Nov 14 22:02:50 zephyr kernel: [42515.310787] [<ffffffff8193b249>] ? common_interrupt+0x89/0x89 Nov 14 22:02:50 zephyr kernel: [42515.310787] <EOI> [<ffffffff817118dd>] ? cpuidle_enter_state+0x13d/0x1f0 Nov 14 22:02:50 zephyr kernel: [42515.310793] [<ffffffff817118d9>] ? cpuidle_enter_state+0x139/0x1f0 Nov 14 22:02:50 zephyr kernel: [42515.310795] [<ffffffff8114032a>] ? cpu_startup_entry+0x1ba/0x250 Nov 14 22:02:50 zephyr kernel: [42515.310798] [<ffffffff820c0ea6>] ? start_kernel+0x38b/0x393 Nov 14 22:02:50 zephyr kernel: [42515.310800] ---[ end trace f2dd8b513381f3b4 ]---
The full dmesg would be nice, since it is a strange error. The error will be different with v4.9 (and different again in v4.10!), so getting feedback on changes there will be very useful. My first hunch is that this is going to be intel_iommu=igfx_off related.
Created attachment 127974 [details] dmesg from boot to error
i have had this error from the first time i ran X on the machine. every kernel i have ever built on it and all X drivers i have tried, over the course of about a year and a half exhibits this behavior. i don't recall having a problem when i disabled sna acceleration, but i use off-screen compositing for my window manager [e16, with opacity effects] and those are unusably slow with uxa.
*** This bug has been marked as a duplicate of bug 89360 ***
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