[Bug 103347] [dp] intel_dp.c:1554 WARN_ON(len <=8)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103347

--- Comment #2 from f.hartung at outlook.de ---
This bug is still present in kernel 4.15.16 & 4.16.1 so IMHO it is still valid.
I use a Asrock J3455-ITX board that uses a similar cpu as your NUC6CAYB so I
guess it could be related to the LSPCON stuff and how Intel handled the DP to
HDMI conversion.

My dmesg output is flooded by the following messages.

[   83.324999] ------------[ cut here ]------------
[   83.325000] WARN_ON(len <= 0)
[   83.325017] WARNING: CPU: 0 PID: 915 at drivers/gpu/drm/i915/intel_dp.c:1554
intel_dp_max_link_rate+0x5e/0x80
[   83.325017] Modules linked in: 8021q wl(PO) iwlmvm mac80211 iwlwifi
snd_hda_codec_hdmi btusb btrtl btbcm btintel bluetooth intel_powerclamp
intel_rapl snd_hda_codec_realtek ecdh_generic snd_usb_audio
snd_hda_codec_generic snd_usbmidi_lib snd_rawmidi snd_hda_intel cfg80211
snd_hda_codec snd_hda_core rfkill snd_hwdep overlay uvesafb
[   83.325036] CPU: 0 PID: 915 Comm: Xorg Tainted: P        W  O     4.15.16 #1
[   83.325037] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./J3455-ITX, BIOS P1.60 01/16/2018
[   83.325039] RIP: 0010:intel_dp_max_link_rate+0x5e/0x80
[   83.325040] RSP: 0018:ffffa2eceeaf3bd8 EFLAGS: 00010292
[   83.325042] RAX: 0000000000000011 RBX: ffffa2ed366a7000 RCX:
ffffffffaf246a18
[   83.325043] RDX: 0000000000000001 RSI: 0000000000000086 RDI:
0000000000000283
[   83.325044] RBP: 0000000000098580 R08: 00000000000029ac R09:
ffffffffaffc0c00
[   83.325045] R10: fffffbff49d0d980 R11: 0000000000000001 R12:
ffffa2ed34366000
[   83.325046] R13: 00000000000121c0 R14: 0000000000000000 R15:
ffffa2ed366a7100
[   83.325048] FS:  00007ff786e5fd00(0000) GS:ffffa2ed3fc00000(0000)
knlGS:0000000000000000
[   83.325050] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   83.325051] CR2: 00000000020ae5b8 CR3: 0000000274368000 CR4:
00000000001406b0
[   83.325052] Call Trace:
[   83.325054]  intel_dp_mode_valid+0xa7/0x160
[   83.325057]  drm_helper_probe_single_connector_modes+0x3de/0x6b0
[   83.325060]  drm_mode_getconnector+0x146/0x300
[   83.325062]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
[   83.325065]  drm_ioctl_kernel+0x5b/0xb0
[   83.325067]  drm_ioctl+0x29f/0x340
[   83.325069]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
[   83.325072]  ? generic_file_write_iter+0xf1/0x1e0
[   83.325075]  ? __vfs_write+0xdd/0x140
[   83.325078]  do_vfs_ioctl+0x90/0x5f0
[   83.325080]  SyS_ioctl+0x3b/0x70
[   83.325082]  do_syscall_64+0x6f/0x130
[   83.325084]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   83.325086] RIP: 0033:0x7ff785690767
[   83.325087] RSP: 002b:00007ffd8bfd6108 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[   83.325089] RAX: ffffffffffffffda RBX: 00000000020aa9f0 RCX:
00007ff785690767
[   83.325090] RDX: 00007ffd8bfd6190 RSI: 00000000c05064a7 RDI:
000000000000000a
[   83.325091] RBP: 00007ffd8bfd6190 R08: 00000000020a9f00 R09:
0000000000000001
[   83.325092] R10: 0000000000000000 R11: 0000000000000246 R12:
00000000c05064a7
[   83.325093] R13: 000000000000000a R14: 000000000000000a R15:
00007ffd8bfd6190
[   83.325094] Code: 8a fc eb 10 8b 32 89 c1 48 83 ea 04 83 e8 01 41 39 f0 7d
1f 85 c0 75 ec 48 c7 c6 ff c2 f8 ae 48 c7 c7 57 1e ef ae e8 02 8e 6f ff <0f> 0b
b8 d0 78 02 00 c3 83 e9 01 48 63 c9 8b 84 8f 8c 00 00 00 
[   83.325134] ---[ end trace e51363f93b03cea5 ]---

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