Well, I have tested: ilya@thinkpad:~$ uname -a Linux thinkpad 4.8.0-040800rc4-generic #201608312129 SMP Thu Sep 1 01:31:59 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Installation was smooth except the complaints about missing firmware---I dismissed these warnings. A new kernel hang after the very first reboot, but later worked flawlessly. Seems like the topic issue is *FIXED*. No traps after VT switching back and forth, multiple times. Uptime is now ilya@thinkpad:~$ uptime 07:06:02 up 1 day, 21 min, 1 user, load average: 0.43, 0.28, 0.17 ilya@thinkpad:~$ HOWEVER: A new issue appear: [ 3.843410] ------------[ cut here ]------------ [ 3.843444] WARNING: CPU: 0 PID: 274 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_pm.c:7866 sandybridge_pcode_write+0x109/0x1f0 [i915] [ 3.843444] Missing switch case (16) in gen6_check_mailbox_status [ 3.843456] Modules linked in: sd_mod hid_generic usbhid hid crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd ahci i915 e1000e libahci ptp libata pps_core sdhci_pci sdhci psmouse mmc_core scsi_mod ehci_pci ehci_hcd i2c_algo_bit drm_kms_helper usbcore drm thermal usb_common wmi fjes video button [ 3.843458] CPU: 0 PID: 274 Comm: kworker/0:2 Not tainted 4.8.0-040800rc4-generic #201608312129 [ 3.843458] Hardware name: LENOVO 4286CTO/4286CTO, BIOS 8DET50WW (1.20 ) 07/07/2011 [ 3.843477] Workqueue: events intel_gen6_powersave_work [i915] [ 3.843478] 0000000000000286 00000000c8d9b468 ffffffffb2b40904 ffff98ad436efd58 [ 3.843479] 0000000000000000 ffffffffb287f5ce ffff98ad43510000 ffff98ad436efdb0 [ 3.843480] 0000000000000000 ffff98ad4351a438 ffff98ad43518830 ffff98ad4351a378 [ 3.843480] Call Trace: [ 3.843484] [<ffffffffb2b40904>] ? dump_stack+0x5c/0x78 [ 3.843486] [<ffffffffb287f5ce>] ? __warn+0xbe/0xe0 [ 3.843487] [<ffffffffb287f64f>] ? warn_slowpath_fmt+0x5f/0x80 [ 3.843516] [<ffffffffc0649179>] ? sandybridge_pcode_write+0x109/0x1f0 [i915] [ 3.843532] [<ffffffffc064ab48>] ? intel_gen6_powersave_work+0x2b8/0x1430 [i915] [ 3.843534] [<ffffffffb2898c44>] ? process_one_work+0x184/0x4b0 [ 3.843535] [<ffffffffb2898fbd>] ? worker_thread+0x4d/0x480 [ 3.843536] [<ffffffffb2e1d4e1>] ? __schedule+0x261/0x720 [ 3.843537] [<ffffffffb2898f70>] ? process_one_work+0x4b0/0x4b0 [ 3.843538] [<ffffffffb289f11d>] ? kthread+0xcd/0xf0 [ 3.843540] [<ffffffffb282c751>] ? __switch_to+0x2c1/0x7a0 [ 3.843541] [<ffffffffb2e2205f>] ? ret_from_fork+0x1f/0x40 [ 3.843542] [<ffffffffb289f050>] ? kthread_create_on_node+0x1a0/0x1a0 [ 3.843543] ---[ end trace 2890e7c79ed0a408 ]--- As can be seen from the timestamp, it occurs directly on boot, but also right after coming out of suspend: [16814.964045] PM: Finishing wakeup. [16814.964047] Restarting tasks ... [16814.964068] ACPI: \_SB_.PCI0.LPC_.EC__.BAT1: docking [16814.964439] ACPI: \_SB_.PCI0.LPC_.EC__.BAT1: Unable to dock! [16814.988599] done. [16814.989172] video LNXVIDEO:00: Restoring backlight state [16815.009679] ------------[ cut here ]------------ [16815.009732] WARNING: CPU: 0 PID: 12510 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_pm.c:7866 sandybridge_pcode_write+0x109/0x1f0 [i915] [16815.009734] Missing switch case (16) in gen6_check_mailbox_status [16815.009736] Modules linked in: ctr ccm fuse uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev media msr intel_rapl x86_pkg_temp_thermal coretemp arc4 iwldvm kvm_intel mac80211 joydev kvm iwlwifi irqbypass serio_raw sg intel_cstate cfg80211 intel_rapl_perf lpc_ich mfd_core shpchp snd_hda_codec_hdmi snd_hda_codec_conexant snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm thinkpad_acpi snd_seq_midi snd_seq_midi_event snd_rawmidi nvram rfkill battery ip6t_REJECT nf_reject_ipv6 ac nf_log_ipv6 snd_seq snd_seq_device xt_hl snd_timer ip6t_rt snd evdev soundcore nf_conntrack_ipv6 mei_me nf_defrag_ipv6 tpm_tis mei tpm_tis_core ipt_REJECT nf_reject_ipv4 tpm nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 [16815.009798] xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack parport_pc iptable_filter ip_tables ppdev lp parport x_tables autofs4 ext4 crc16 jbd2 fscrypto mbcache btrfs xor raid6_pq algif_skcipher af_alg dm_crypt dm_mirror dm_region_hash dm_log dm_mod sd_mod hid_generic usbhid hid crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd ahci i915 e1000e libahci ptp libata pps_core sdhci_pci sdhci psmouse mmc_core scsi_mod ehci_pci ehci_hcd i2c_algo_bit drm_kms_helper usbcore drm thermal usb_common wmi fjes video button [16815.009856] CPU: 0 PID: 12510 Comm: kworker/0:1 Tainted: G W 4.8.0-040800rc4-generic #201608312129 [16815.009858] Hardware name: LENOVO 4286CTO/4286CTO, BIOS 8DET50WW (1.20 ) 07/07/2011 [16815.009898] Workqueue: events intel_gen6_powersave_work [i915] [16815.009901] 0000000000000286 0000000058785335 ffffffffb2b40904 ffff98ab609b3d58 [16815.009905] 0000000000000000 ffffffffb287f5ce ffff98ad43510000 ffff98ab609b3db0 [16815.009909] 0000000000000000 ffff98ad4351a438 ffff98ad43518830 ffff98ad4351a378 [16815.009913] Call Trace: [16815.009922] [<ffffffffb2b40904>] ? dump_stack+0x5c/0x78 [16815.009927] [<ffffffffb287f5ce>] ? __warn+0xbe/0xe0 [16815.009931] [<ffffffffb287f64f>] ? warn_slowpath_fmt+0x5f/0x80 [16815.009968] [<ffffffffc0649179>] ? sandybridge_pcode_write+0x109/0x1f0 [i915] [16815.010004] [<ffffffffc064ab48>] ? intel_gen6_powersave_work+0x2b8/0x1430 [i915] [16815.010009] [<ffffffffb2898c44>] ? process_one_work+0x184/0x4b0 [16815.010012] [<ffffffffb2898fbd>] ? worker_thread+0x4d/0x480 [16815.010016] [<ffffffffb2e1d4e1>] ? __schedule+0x261/0x720 [16815.010019] [<ffffffffb2898f70>] ? process_one_work+0x4b0/0x4b0 [16815.010022] [<ffffffffb289f11d>] ? kthread+0xcd/0xf0 [16815.010026] [<ffffffffb282c751>] ? __switch_to+0x2c1/0x7a0 [16815.010030] [<ffffffffb2e2205f>] ? ret_from_fork+0x1f/0x40 [16815.010034] [<ffffffffb289f050>] ? kthread_create_on_node+0x1a0/0x1a0 [16815.010036] ---[ end trace 2890e7c79ed0a409 ]--- On the other hand, it seems nothing is affected by this error. System works normally. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1583817 Title: WARNING: CPU: 1 PID: 865 at /home/kernel/COD/linux/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b0/0x1c0 [drm] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1583817/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
