[Bug 93578] Intel HD 520 failed to train DP when connected with a external monitor

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Sep 8 12:26:06 UTC 2016 

https://bugs.freedesktop.org/show_bug.cgi?id=93578

--- Comment #55 from Bruce Cartland <bruce.cartland at pobox.com> ---
Displayport crash. Dell P2715Q Monitor. Tumbleweed. 4.7.2-1-default kernel.
Works perfectly in Windows 10 (dual boot).

(Repeatedly trying various adapters caused the kde desktop to become
"corrupted". From a console login deleting ~/.local/share/kscreen recovered the
desktop.)

[  349.323974] ------------[ cut here ]------------
[  349.324013] WARNING: CPU: 0 PID: 1612 at
../drivers/gpu/drm/i915/intel_display.c:13955 skl_max_scale.part.109+0x72/0x80
[i915]
[  349.324015] WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock)
[  349.324017] Modules linked in:
[  349.324019]  rfcomm af_packet nf_log_ipv6 xt_pkttype nf_log_ipv4
nf_log_common xt_LOG xt_limit vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O)
bnep msr nls_iso8859_1 nls_cp437 vfat xfs fuse libcrc32c fat ax88179_178a
usbnet mii snd_usb_audio snd_usbmidi_lib snd_rawmidi hid_generic snd_seq_device
btusb btrtl uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2
videobuf2_core videodev hid_multitouch snd_hda_codec_hdmi dell_led
snd_hda_codec_realtek snd_hda_codec_generic snd_soc_skl snd_soc_skl_ipc
snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_soc_sst_match snd_soc_core
snd_compress snd_hda_intel snd_hda_codec snd_hda_core intel_rapl snd_hwdep
x86_pkg_temp_thermal intel_powerclamp coretemp snd_pcm brcmfmac iTCO_wdt
dell_laptop i2c_designware_platform brcmutil rtsx_pci_ms dell_wmi
iTCO_vendor_support
[  349.324072]  snd_timer kvm_intel i2c_designware_core dell_smbios memstick
cfg80211 kvm dcdbas irqbypass snd crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper
cryptd idma64 pcspkr joydev virt_dma soundcore i2c_i801 shpchp mei_me mei
intel_lpss_pci intel_pch_thermal ip6t_REJECT nf_reject_ipv6 xt_tcpudp
processor_thermal_device nf_conntrack_ipv6 intel_soc_dts_iosf nf_defrag_ipv6
thermal fan wmi hci_uart battery pinctrl_sunrisepoint pinctrl_intel
ip6table_raw btbcm btqca btintel bluetooth rfkill intel_lpss_acpi ipt_REJECT
intel_lpss nf_reject_ipv4 intel_hid sparse_keymap int3400_thermal
int3403_thermal int340x_thermal_zone acpi_thermal_rel iptable_raw acpi_als
acpi_pad ac tpm_tis kfifo_buf fjes industrialio tpm xt_CT iptable_filter
ip6table_mangle
[  349.324115]  nf_conntrack_netbios_ns nf_conntrack_broadcast
nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack
ip6table_filter ip6_tables x_tables btrfs xor hid_logitech_hidpp
hid_logitech_dj usbhid raid6_pq rtsx_pci_sdmmc mmc_core crc32c_intel serio_raw
nvme nvme_core rtsx_pci mfd_core i915 i2c_algo_bit drm_kms_helper xhci_pci
syscopyarea sysfillrect sysimgblt fb_sys_fops xhci_hcd usbcore drm usb_common
i2c_hid video button sg efivarfs
[  349.324142] CPU: 0 PID: 1612 Comm: X Tainted: G        W  O   
4.7.2-1-default #1
[  349.324143] Hardware name: Dell Inc. XPS 13 9350/0VM5NC, BIOS 1.4.4
06/14/2016
[  349.324145]  0000000000000000 ffffffff813932a4 ffff88045aa77b00
0000000000000000
[  349.324149]  ffffffff8107ca1e ffff88043e7a10c0 ffff88045aa77b50
ffff88046a53b000
[  349.324151]  ffff88006aeca240 ffff88002fd3ec00 ffffffffa027a040
ffffffff8107ca8f
[  349.324154] Call Trace:
[  349.324167]  [<ffffffff8102ed5e>] dump_trace+0x5e/0x320
[  349.324173]  [<ffffffff8102f12c>] show_stack_log_lvl+0x10c/0x180
[  349.324178]  [<ffffffff8102fe41>] show_stack+0x21/0x40
[  349.324182]  [<ffffffff813932a4>] dump_stack+0x5c/0x78
[  349.324187]  [<ffffffff8107ca1e>] __warn+0xbe/0xe0
[  349.324192]  [<ffffffff8107ca8f>] warn_slowpath_fmt+0x4f/0x60
[  349.324222]  [<ffffffffa021daf2>] skl_max_scale.part.109+0x72/0x80 [i915]
[  349.324253]  [<ffffffffa021dbba>] intel_check_primary_plane+0xba/0xd0 [i915]
[  349.324280]  [<ffffffffa020ff44>] intel_plane_atomic_check+0x124/0x1c0
[i915]
[  349.324292]  [<ffffffffa0175be4>] drm_atomic_helper_check_planes+0x44/0x1c0
[drm_kms_helper]
[  349.324321]  [<ffffffffa022b1df>] intel_atomic_check+0x12f/0x770 [i915]
[  349.324345]  [<ffffffffa0054254>] drm_atomic_check_only+0x194/0x600 [drm]
[  349.324364]  [<ffffffffa00546d2>] drm_atomic_commit+0x12/0x60 [drm]
[  349.324375]  [<ffffffffa0177b39>] drm_atomic_helper_set_config+0x79/0xb0
[drm_kms_helper]
[  349.324392]  [<ffffffffa0043d71>] drm_mode_set_config_internal+0x61/0x110
[drm]
[  349.324409]  [<ffffffffa00483f7>] drm_mode_setcrtc+0x427/0x530 [drm]
[  349.324423]  [<ffffffffa003a5a1>] drm_ioctl+0x131/0x4c0 [drm]
[  349.324428]  [<ffffffff81222c40>] do_vfs_ioctl+0x90/0x5c0
[  349.324434]  [<ffffffff812231e4>] SyS_ioctl+0x74/0x80
[  349.324439]  [<ffffffff816bb4f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[  349.326390] DWARF2 unwinder stuck at entry_SYSCALL_64_fastpath+0x1e/0xa8

[  349.326393] Leftover inexact backtrace:

[  349.326407] ---[ end trace 9e01cf35c46be0e9 ]---

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