Does anyone know about this error?

[Lee_g_]

Hi all, currently i'm having ciritical issue with using quick sync on linux system.

following information is the detail.

Hardware : Intel(R) Xeon(R) CPU E3-1245 v3

OS : CentOS 7 / 3.10.0-123.9.3.29404.MSSr1.el7.x86_64( patched kernel from SDK R3 version )

It works well, but constantly getting warning which is logged at /var/log/message.

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Mar 25 15:00:03 localhost kernel: ------------[ cut here ]------------
Mar 25 15:00:03 localhost kernel: WARNING: at drivers/gpu/drm/i915/intel_display.c:6015 hsw_disable_lcpll+0x514/0x640 [i915]()
Mar 25 15:00:03 localhost kernel: Power well on
Mar 25 15:00:03 localhost kernel: Modules linked in: sg fuse ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables eeepc_wmi asus_wmi sparse_keymap rfkill ppdev iTCO_wdt iTCO_vendor_support mxm_wmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi mei_me mei snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_page_alloc snd_timer snd lpc_ich shpchp i2c_i801 serio_raw mfd_core soundcore pcspkr parport_pc parport coretemp kvm crct10dif_pclmul crc32_pclmul
Mar 25 15:00:03 localhost kernel: crc32c_intel ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd wmi acpi_cpufreq mperf nfsd auth_rpcgss nfs_acl lockd sunrpc xfs libcrc32c sd_mod crc_t10dif crct10dif_common i915 ahci igb firewire_ohci libahci drm_kms_helper libata drm ptp pps_core dca firewire_core i2c_algo_bit crc_itu_t i2c_core video dm_mirror dm_region_hash dm_log dm_mod
Mar 25 15:00:03 localhost kernel: CPU: 2 PID: 71 Comm: kworker/2:1 Not tainted 3.10.0-123.9.3.29404.MSSr1.el7.x86_64 #1
Mar 25 15:00:03 localhost kernel: Hardware name: ASUS All Series/P9D WS, BIOS 2004 06/05/2014
Mar 25 15:00:03 localhost kernel: Workqueue: events hsw_enable_pc8_work [i915]
Mar 25 15:00:03 localhost kernel: ffff880213fbbd60 00000000a6238018 ffff880213fbbd18 ffffffff815e27db
Mar 25 15:00:03 localhost kernel: ffff880213fbbd50 ffffffff8105dee1 ffff880210160000 ffff880210238c48
Mar 25 15:00:03 localhost kernel: 0000000000000001 0000000000000001 ffff880210238c50 ffff880213fbbdb8
Mar 25 15:00:03 localhost kernel: Call Trace:
Mar 25 15:00:03 localhost kernel: [<ffffffff815e27db>] dump_stack+0x19/0x1b
Mar 25 15:00:03 localhost kernel: [<ffffffff8105dee1>] warn_slowpath_common+0x61/0x80
Mar 25 15:00:03 localhost kernel: [<ffffffff8105df5c>] warn_slowpath_fmt+0x5c/0x80
Mar 25 15:00:03 localhost kernel: [<ffffffffa01dc2b4>] hsw_disable_lcpll+0x514/0x640 [i915]
Mar 25 15:00:03 localhost kernel: [<ffffffffa01dc991>] hsw_enable_pc8_work+0x81/0xc0 [i915]
Mar 25 15:00:03 localhost kernel: [<ffffffff8107e03b>] process_one_work+0x17b/0x460
Mar 25 15:00:03 localhost kernel: [<ffffffff8107ee0b>] worker_thread+0x11b/0x400
Mar 25 15:00:03 localhost kernel: [<ffffffff8107ecf0>] ? rescuer_thread+0x400/0x400
Mar 25 15:00:03 localhost kernel: [<ffffffff81085aff>] kthread+0xcf/0xe0
Mar 25 15:00:03 localhost kernel: [<ffffffff81085a30>] ? kthread_create_on_node+0x140/0x140
Mar 25 15:00:03 localhost kernel: [<ffffffff815f2e2c>] ret_from_fork+0x7c/0xb0
Mar 25 15:00:03 localhost kernel: [<ffffffff81085a30>] ? kthread_create_on_node+0x140/0x140
Mar 25 15:00:03 localhost kernel: ---[ end trace 77b1f74514ff84bc ]---

---------------------------------------------------------------

It is just warning, actually, but months ago the system was shut downed because of it.

I made same environment to find what's wrong. but no chance to catch the errors.

Does anyone know about this warning? any information could be very helpful. thanks.

[Sravanthi_K_Intel]

Hello Lee,

Can you provide some more information on what you are trying to run, and what does the output you pasted above correspond to? Few comments:

- Our latest MSS release is R4, so kindly update to that release. It is more stable.

- (After updating and before) Can you send us the output of the following commands - "uname -ar", "lspci -nn | grep VGA", "lsmod | grep i915" 

- Can you run one of our sample applications as root (not sudo, but as root), and send the output you are seeing?

Thanks.