Hi,
With 4.3.rc2+ I am seeing below WARN followed by a link training error
when the login screen comes up on ubuntu. Once I get the error log in
console screen goes blank and stays that way. I am also not able to get
to virtual terminal.
The panel connected is eDP.
[ 67.279643] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
[ 67.279951] input: Video Bus as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input9
[ 67.280054] [drm] Initialized i915 1.6.0 20150911 for 0000:00:02.0 on
minor 0
[ 67.327150] fbcon: inteldrmfb (fb0) is primary device
[ 67.327285] ------------[ cut here ]------------
[ 67.327328] WARNING: CPU: 0 PID: 40 at
drivers/gpu/drm/i915/intel_uncore.c:619
hsw_unclaimed_reg_debug.isra.14+0x70/0x90 [i915]()
[ 67.327329] Unclaimed register detected after writing to register 0x68970
[ 67.327361] Modules linked in: asix usbnet mii i915(E) intel_rapl
iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel
hid_generic kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd
drm_kms_helper drm serio_raw i2c_algo_bit fb_sys_fops usbhid syscopyarea
sysfillrect sysimgblt mei_me mei wmi i2c_hid hid soc_button_array
winbond_cir rc_core 8250_fintek video acpi_pad mac_hid parport_pc ppdev
lp parport autofs4 e1000e ahci sdhci_pci ptp libahci psmouse pps_core sdhci
[ 67.327363] CPU: 0 PID: 40 Comm: kworker/u16:1 Tainted: G W E
4.3.0-rc2+ #3
[ 67.327367] Workqueue: events_unbound async_run_entry_fn
[ 67.327370] ffffffffc04c0fa0 ffff88007546f750 ffffffff8139bc1d
ffff88007546f798
[ 67.327371] ffff88007546f788 ffffffff81077d56 ffff880079cc0078
0000000000068970
[ 67.327372] 0000000000068970 ffff880079cc0078 ffff880079cc0080
ffff88007546f7e8
[ 67.327373] Call Trace:
[ 67.327377] [<ffffffff8139bc1d>] dump_stack+0x44/0x57
[ 67.327378] [<ffffffff81077d56>] warn_slowpath_common+0x86/0xc0
[ 67.327380] [<ffffffff81077ddc>] warn_slowpath_fmt+0x4c/0x50
[ 67.327404] [<ffffffffc043e870>]
hsw_unclaimed_reg_debug.isra.14+0x70/0x90 [i915]
[ 67.327425] [<ffffffffc04425fd>] gen9_write32+0x12d/0x310 [i915]
[ 67.327456] [<ffffffffc0452494>] skl_detach_scaler.isra.12+0x74/0xb0
[i915]
[ 67.327484] [<ffffffffc0452533>] skl_detach_scalers+0x63/0x70 [i915]
[ 67.327497] [<ffffffffc04525eb>] intel_begin_crtc_commit+0xab/0x1f0
[i915]
[ 67.327502] [<ffffffffc020055b>]
drm_atomic_helper_commit_planes_on_crtc+0x5b/0x230 [drm_kms_helper]
[ 67.327519] [<ffffffffc045f1a0>] intel_atomic_commit+0x2a0/0x1ed0 [i915]
[ 67.327521] [<ffffffff8179665f>] ? __ww_mutex_lock+0x5f/0x97
[ 67.327546] [<ffffffffc019cc88>] ? drm_atomic_check_only+0x158/0x580
[drm]
[ 67.327554] [<ffffffffc019ca67>] ?
drm_atomic_add_affected_connectors+0x27/0xf0 [drm]
[ 67.327577] [<ffffffffc019d0e7>] drm_atomic_commit+0x37/0x60 [drm]
[ 67.327580] [<ffffffffc02023ce>] restore_fbdev_mode+0x27e/0x2c0
[drm_kms_helper]
[ 67.327583] [<ffffffffc0204403>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
[ 67.327586] [<ffffffffc020447c>] drm_fb_helper_set_par+0x2c/0x50
[drm_kms_helper]
[ 67.327604] [<ffffffffc0476f8a>] intel_fbdev_set_par+0x1a/0x60 [i915]
[ 67.327605] [<ffffffff814118a6>] fbcon_init+0x4c6/0x550
[ 67.327608] [<ffffffff8149bf6a>] visual_init+0xca/0x130
[ 67.327609] [<ffffffff8149e526>] do_bind_con_driver+0x146/0x310
[ 67.327611] [<ffffffff8149ea11>] do_take_over_console+0x141/0x1b0
[ 67.327611] [<ffffffff8140caa7>] do_fbcon_takeover+0x57/0xb0
[ 67.327612] [<ffffffff814122ab>] fbcon_event_notify+0x60b/0x750
[ 67.327614] [<ffffffff81096949>] notifier_call_chain+0x49/0x70
[ 67.327615] [<ffffffff81096c6d>]
__blocking_notifier_call_chain+0x4d/0x70
[ 67.327617] [<ffffffff81096ca6>] blocking_notifier_call_chain+0x16/0x20
[ 67.327618] [<ffffffff814179fb>] fb_notifier_call_chain+0x1b/0x20
[ 67.327619] [<ffffffff814198de>] register_framebuffer+0x1de/0x300
[ 67.327622] [<ffffffffc02046f8>]
drm_fb_helper_initial_config+0x258/0x3c0 [drm_kms_helper]
[ 67.327638] [<ffffffffc047807b>]
intel_fbdev_initial_config+0x1b/0x20 [i915]
[ 67.327639] [<ffffffff81098478>] async_run_entry_fn+0x48/0x150
[ 67.327640] [<ffffffff8108fc4e>] process_one_work+0x14e/0x3d0
[ 67.327641] [<ffffffff810902fa>] worker_thread+0x11a/0x470
[ 67.327642] [<ffffffff81794928>] ? __schedule+0x358/0x920
[ 67.327643] [<ffffffff810901e0>] ? rescuer_thread+0x310/0x310
[ 67.327644] [<ffffffff81095a29>] kthread+0xc9/0xe0
[ 67.327645] [<ffffffff81095960>] ? kthread_park+0x60/0x60
[ 67.327647] [<ffffffff81798acf>] ret_from_fork+0x3f/0x70
[ 67.327648] [<ffffffff81095960>] ? kthread_park+0x60/0x60
[ 67.327648] ---[ end trace 710ab680f03a2d12 ]---
[ 67.377298] Console: switching to colour frame buffer device 400x112
[ 67.385538] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 67.541546] EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro
[ 67.667504] systemd-journald[270]: Received request to flush runtime
journal from PID 1
[ 67.795077] audit: type=1400 audit(1443155408.705:2):
apparmor="STATUS" operation="profile_load"
name="/usr/lib/lightdm/lightdm-guest-session" pid=440 comm="apparmor_parser"
[ 67.795082] audit: type=1400 audit(1443155408.705:3):
apparmor="STATUS" operation="profile_load" name="chromium" pid=440
comm="apparmor_parser"
[ 67.796436] audit: type=1400 audit(1443155408.709:4):
apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=440
comm="apparmor_parser"
[ 67.796441] audit: type=1400 audit(1443155408.709:5):
apparmor="STATUS" operation="profile_load"
name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=440
comm="apparmor_parser"
[ 67.796444] audit: type=1400 audit(1443155408.709:6):
apparmor="STATUS" operation="profile_load"
name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=440 comm="apparmor_parser"
[ 67.796447] audit: type=1400 audit(1443155408.709:7):
apparmor="STATUS" operation="profile_load"
name="/usr/lib/connman/scripts/dhclient-script" pid=440
comm="apparmor_parser"
[ 67.803694] audit: type=1400 audit(1443155408.717:8):
apparmor="STATUS" operation="profile_load" name="/usr/bin/evince"
pid=440 comm="apparmor_parser"
[ 67.803700] audit: type=1400 audit(1443155408.717:9):
apparmor="STATUS" operation="profile_load" name="sanitized_helper"
pid=440 comm="apparmor_parser"
[ 67.803704] audit: type=1400 audit(1443155408.717:10):
apparmor="STATUS" operation="profile_load"
name="/usr/bin/evince-previewer" pid=440 comm="apparmor_parser"
[ 67.803707] audit: type=1400 audit(1443155408.717:11):
apparmor="STATUS" operation="profile_load" name="sanitized_helper"
pid=440 comm="apparmor_parser"
[ 67.912026] asix 1-7:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC1E1
[ 68.120538] asix 1-7:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC1E1
[ 68.205645] cgroup: new mount options do not match the existing
superblock, will be ignored
[ 68.275288] cfg80211: World regulatory domain updated:
[ 68.275290] cfg80211: DFS Master region: unset
[ 68.275291] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp), (dfs_cac_time)
[ 68.275292] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300
mBi, 2000 mBm), (N/A)
[ 68.275294] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300
mBi, 2000 mBm), (N/A)
[ 68.275295] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300
mBi, 2000 mBm), (N/A)
[ 68.275295] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300
mBi, 2000 mBm), (N/A)
[ 68.275296] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300
mBi, 2000 mBm), (N/A)
[ 69.271525] [drm] RC6 on
[ 70.299775] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed
to update link training
[ 70.467534] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed
to update link training
[ 88.381176] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed
to update link training
regards
Arun
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