[Bug 82763] [drm:intel_dp_start_link_train] error on connecting an active DP-to-VGA converter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82763

--- Comment #9 from Daniele Pizzolli <daniele.pizzolli at create-net.org> ---
(In reply to Daniele Pizzolli from comment #8)

[]

> Unfortunately I do not have access to the monitor right now (will do
> the test around Christmas), I see that the xrand output now shows
> DP1-1 for the old DP2 and DP1-2 for the old DP-3 and DP1-3 for the old
> DP-4:

[]

Bad news.  After disconnecting the dock station I still see the olds
monitor as connected in xrandr output and not the new one connected
directly to the laptop.  The same monitor show up (and works) if I use
an HDMI cable.  This is the trace back I got:

[59717.527058] ------------[ cut here ]------------
[59717.527075] WARNING: CPU: 0 PID: 1055 at
drivers/gpu/drm/drm_dp_mst_topology.c:1268 process_single_tx_qlock+0x5d0/0x640
[drm_kms_helper]()
[59717.527077] fail
[59717.527078] Modules linked in: md4 hmac nls_utf8 cifs dns_resolver fscache
xt_nat xt_tcpudp sdhci_pci sdhci mmc_core veth xt_addrtype xt_conntrack
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4
nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bridge stp llc dm_thin_pool
dm_persistent_data dm_bio_prison dm_bufio libcrc32c iptable_filter ip_tables
x_tables binfmt_misc pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O)
hid_generic usbhid hid joydev usb_storage snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support arc4 ppdev dell_wmi sparse_keymap ecb btusb bluetooth
uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev
media dell_laptop dcdbas iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp
intel_rapl coretemp kvm_intel kvm nouveau psmouse evdev iwlwifi
[59717.527119]  mxm_wmi pcspkr serio_raw ttm cfg80211 i2c_i801 lpc_ich mfd_core
rfkill snd_hda_codec_realtek snd_hda_codec_generic battery i915 8250_fintek
parport_pc parport snd_hda_intel snd_hda_controller wmi dell_smo8800
snd_hda_codec snd_hwdep drm_kms_helper snd_pcm drm video ac snd_timer snd
xhci_pci i2c_algo_bit button soundcore shpchp xhci_hcd i2c_core mei_me mei
processor loop fuse autofs4 ext4 crc16 mbcache jbd2 btrfs xor raid6_pq
algif_skcipher af_alg dm_crypt dm_mod xts sg sr_mod cdrom sd_mod
crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper ahci cryptd libahci ehci_pci
libata ehci_hcd usbcore scsi_mod usb_common e1000e ptp pps_core thermal
thermal_sys
[59717.527166] CPU: 0 PID: 1055 Comm: Xorg Tainted: G        W  O  
3.18.0-2014y-12m-19d-14h-33m-07s+ #10
[59717.527167] Hardware name: Dell Inc. Latitude E5440/08RCYC, BIOS A07
06/26/2014
[59717.527169]  0000000000000000 0000000000000009 ffffffff8153e0a1
ffff88041914f908
[59717.527172]  ffffffff8106a137 0000000000000000 0000000000001000
0000000000000010
[59717.527175]  ffff88041870d608 000000000000000c ffffffff8106a19a
ffffffffa0400b85
[59717.527178] Call Trace:
[59717.527183]  [<ffffffff8153e0a1>] ? dump_stack+0x41/0x51
[59717.527187]  [<ffffffff8106a137>] ? warn_slowpath_common+0x77/0x90
[59717.527191]  [<ffffffff8106a19a>] ? warn_slowpath_fmt+0x4a/0x50
[59717.527202]  [<ffffffffa03f4580>] ? process_single_tx_qlock+0x5d0/0x640
[drm_kms_helper]
[59717.527205]  [<ffffffff81541bae>] ? mutex_lock+0xe/0x30
[59717.527213]  [<ffffffffa03f4628>] ? process_single_down_tx_qlock+0x38/0x120
[drm_kms_helper]
[59717.527221]  [<ffffffffa03f476c>] ? drm_dp_queue_down_tx+0x5c/0x70
[drm_kms_helper]
[59717.527229]  [<ffffffffa03f6f7e>] ? drm_dp_mst_i2c_xfer+0x15e/0x270
[drm_kms_helper]
[59717.527241]  [<ffffffffa049a179>] ? drm_for_each_detailed_block+0x39/0x150
[drm]
[59717.527250]  [<ffffffffa040e23c>] ? __i2c_transfer+0x6c/0x200 [i2c_core]
[59717.527258]  [<ffffffffa040f5c7>] ? i2c_transfer+0x77/0xd0 [i2c_core]
[59717.527269]  [<ffffffffa049addc>] ? drm_do_probe_ddc_edid+0xcc/0x140 [drm]
[59717.527282]  [<ffffffffa049c46d>] ? drm_get_edid+0x2d/0x3f0 [drm]
[59717.527292]  [<ffffffffa03f5dcc>] ? drm_dp_mst_get_edid+0x6c/0x80
[drm_kms_helper]
[59717.527319]  [<ffffffffa05beb88>] ? intel_dp_mst_get_modes+0x28/0x50 [i915]
[59717.527328]  [<ffffffffa03f287a>] ?
drm_helper_probe_single_connector_modes_merge_bits+0xea/0x450 [drm_kms_helper]
[59717.527331]  [<ffffffff81541bae>] ? mutex_lock+0xe/0x30
[59717.527343]  [<ffffffffa0496c19>] ? drm_mode_getconnector+0x339/0x3a0 [drm]
[59717.527356]  [<ffffffffa0488723>] ? drm_ioctl+0x1c3/0x5a0 [drm]
[59717.527360]  [<ffffffff811cdeb0>] ? do_vfs_ioctl+0x2d0/0x4a0
[59717.527364]  [<ffffffff811bf3b3>] ? SYSC_newfstat+0x23/0x30
[59717.527368]  [<ffffffff811ce101>] ? SyS_ioctl+0x81/0xa0
[59717.527372]  [<ffffffff81543e2d>] ? system_call_fastpath+0x16/0x1b
[59717.527374] ---[ end trace 873cfc9233e4a25f ]---

Please let me know if you need more info/test. Thanks and happy holidays.

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