Created attachment 251181 [details] dmesg log Booting linux kernel 4.9.x versions result in warnings about WARN_ON(!msg->buffer != !msg->size) in dmesg. However the system is not affected in any way and boots properly. [ 3.966325] WARNING: CPU: 1 PID: 195 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_dp.c:1062 intel_dp_aux_transfer+0x1ed/0x230 [i915] [ 3.966325] WARN_ON(!msg->buffer != !msg->size) [ 3.966326] Modules linked in: [ 3.966326] i915 ahci psmouse libahci wmi i2c_algo_bit drm_kms_helper video syscopyarea i2c_hid sdhci_acpi sysfillrect hid sdhci sysimgblt fb_sys_fops fjes r8169 drm mii [ 3.966334] CPU: 1 PID: 195 Comm: kworker/u8:3 Tainted: G W 4.9.2-040902-generic #201701090331 [ 3.966334] Hardware name: Hewlett-Packard HP 250 G4 Notebook PC/80C1, BIOS F.11 07/23/2015 [ 3.966336] Workqueue: events_unbound async_run_entry_fn [ 3.966337] ffffa95740973a70 ffffffff9281bd42 ffffa95740973ac0 0000000000000000 [ 3.966339] ffffa95740973ab0 ffffffff92483e7b 00000426faa83447 ffffa95740973b98 [ 3.966341] ffff8c61d0cef0e0 0000000000000003 00000000fffffffb 00000000fffffffb [ 3.966342] Call Trace: [ 3.966345] [<ffffffff9281bd42>] dump_stack+0x63/0x81 [ 3.966346] [<ffffffff92483e7b>] __warn+0xcb/0xf0 [ 3.966348] [<ffffffff92483eff>] warn_slowpath_fmt+0x5f/0x80 [ 3.966350] [<ffffffff92c90999>] ? schedule_hrtimeout_range_clock+0xb9/0x1b0 [ 3.966369] [<ffffffffc02a5a9d>] intel_dp_aux_transfer+0x1ed/0x230 [i915] [ 3.966373] [<ffffffffc0173c72>] drm_dp_dpcd_access+0x72/0x110 [drm_kms_helper] [ 3.966377] [<ffffffffc0173d2b>] drm_dp_dpcd_write+0x1b/0x20 [drm_kms_helper] [ 3.966396] [<ffffffffc02a070b>] intel_dp_start_link_train+0x2cb/0x4c0 [i915] [ 3.966415] [<ffffffffc02a1c69>] intel_dp_check_link_status+0xd9/0x110 [i915] [ 3.966434] [<ffffffffc02a649b>] intel_dp_long_pulse+0x40b/0xb10 [i915] [ 3.966453] [<ffffffffc02a6beb>] intel_dp_detect+0x4b/0x60 [i915] [ 3.966457] [<ffffffffc017515f>] drm_helper_probe_single_connector_modes+0x3ff/0x4f0 [drm_kms_helper] [ 3.966461] [<ffffffffc0183ace>] drm_fb_helper_initial_config+0xae/0x430 [drm_kms_helper] [ 3.966482] [<ffffffffc0297f78>] intel_fbdev_initial_config+0x18/0x30 [i915] [ 3.966483] [<ffffffff924a8907>] async_run_entry_fn+0x37/0x150 [ 3.966485] [<ffffffff9249eb7c>] process_one_work+0x1fc/0x4b0 [ 3.966486] [<ffffffff9249ee7b>] worker_thread+0x4b/0x500 [ 3.966487] [<ffffffff9249ee30>] ? process_one_work+0x4b0/0x4b0 [ 3.966489] [<ffffffff924a54e9>] kthread+0xd9/0xf0 [ 3.966491] [<ffffffff924a5410>] ? kthread_park+0x60/0x60 [ 3.966492] [<ffffffff92c91d35>] ret_from_fork+0x25/0x30 [ 3.966493] ---[ end trace 97eb299e0d03f3b2 ]---