[Bug 82763] [drm:intel_dp_start_link_train] error on connecting an external monitor on VGA

[bugzilla-daemon at freedesktop.org]

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

--- Comment #2 from Daniele Pizzolli <daniele.pizzolli at create-net.org> ---
I am not sure if the problem is the same.

With the same kernel of the latest comment 3.16, with a different screen
that support up to 1920x1200 modes, I was able only see the screen with
xrandr to get few of them working.

Modes and test results:

1920x1200 Warning in dmesg, not working: blank screen
1920x1080 Warning in dmesg, not working: blank screen
1600x1200 Warning in dmesg, not working: blank screen
1680x1050 Warning in dmesg, not working: blank screen
1280x1024 Working
1440x900  Working
1024x768  Not tested
800x600   Not tested
640x480   Not tested

Warning in dmesg:

[ 2727.529259] ------------[ cut here ]------------
[ 2727.529268] WARNING: CPU: 0 PID: 904 at drivers/gpu/drm/i915/intel_dp.c:3122
intel_dp_complete_link_train+0xe9/0x330 [i915]()
[ 2727.529269] Modules linked in: pci_stub vboxpci(O) vboxnetadp(O)
vboxnetflt(O) vboxdrv(O) snd_hda_codec_hdmi joydev arc4 dell_wmi sparse_keymap
iTCO_wdt iTCO_vendor_support x86_pkg_temp_thermal dell_laptop intel_powerclamp
dcdbas intel_rapl ecb iwlmvm coretemp mac80211 kvm_intel uvcvideo nouveau
videobuf2_vmalloc videobuf2_memops btusb kvm videobuf2_core v4l2_common
bluetooth videodev media mxm_wmi pcspkr evdev psmouse serio_raw loop fuse
iwlwifi cfg80211 snd_hda_codec_realtek snd_hda_codec_generic lpc_ich i915
rfkill mfd_core ttm i2c_i801 battery snd_hda_intel snd_hda_controller
drm_kms_helper wmi snd_hda_codec drm video snd_hwdep i2c_algo_bit snd_pcm ac
snd_timer button mei_me i2c_core snd mei soundcore shpchp processor parport_pc
ppdev lp parport autofs4 ext4 crc16 mbcache jbd2 dm_crypt dm_mod sg sd_mod
sr_mod crc_t10dif cdrom crct10dif_generic mmc_block crct10dif_pclmul
crct10dif_common crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd ahci libahci libata
scsi_mod sdhci_pci sdhci ehci_pci ehci_hcd mmc_core xhci_hcd e1000e ptp thermal
usbcore pps_core thermal_sys usb_common
[ 2727.529316] CPU: 0 PID: 904 Comm: Xorg Tainted: G        W  O  3.16.0+ #1
[ 2727.529317] Hardware name: Dell Inc. Latitude E5440/08RCYC, BIOS A07
06/26/2014
[ 2727.529318]  0000000000000009 ffffffff814ef07d 0000000000000000
ffffffff81064c12
[ 2727.529320]  ffff8802232b18d8 0000000000000006 0000000000000000
ffff8802232b1918
[ 2727.529322]  ffff8802232b18f3 ffffffffa050ce39 8000000601000000
0000008077770001
[ 2727.529324] Call Trace:
[ 2727.529327]  [<ffffffff814ef07d>] ? dump_stack+0x41/0x51
[ 2727.529329]  [<ffffffff81064c12>] ? warn_slowpath_common+0x72/0x90
[ 2727.529337]  [<ffffffffa050ce39>] ? intel_dp_complete_link_train+0xe9/0x330
[i915]
[ 2727.529344]  [<ffffffffa0505399>] ? intel_ddi_pre_enable+0x189/0x1e0 [i915]
[ 2727.529352]  [<ffffffffa04ee29c>] ? haswell_crtc_enable+0x39c/0xa30 [i915]
[ 2727.529359]  [<ffffffffa0505d6b>] ? intel_ddi_pll_select+0x3b/0x3c0 [i915]
[ 2727.529366]  [<ffffffffa04f0b27>] ? __intel_set_mode+0x817/0x1660 [i915]
[ 2727.529369]  [<ffffffff81299e52>] ? idr_get_empty_slot+0x192/0x3b0
[ 2727.529371]  [<ffffffff81180c05>] ? __kmalloc+0x1d5/0x4f0
[ 2727.529378]  [<ffffffffa04f3efd>] ? intel_set_mode+0xd/0x30 [i915]
[ 2727.529385]  [<ffffffffa04f4f13>] ? intel_crtc_set_config+0xa23/0xd50 [i915]
[ 2727.529391]  [<ffffffffa041a91a>] ? drm_mode_set_config_internal+0x5a/0xd0
[drm]
[ 2727.529396]  [<ffffffffa041e24a>] ? drm_mode_setcrtc+0x25a/0x560 [drm]
[ 2727.529401]  [<ffffffffa040f7f3>] ? drm_ioctl+0x1c3/0x5a0 [drm]
[ 2727.529404]  [<ffffffff811abb20>] ? do_vfs_ioctl+0x2d0/0x4a0
[ 2727.529406]  [<ffffffff8108272c>] ? task_work_run+0xac/0xe0
[ 2727.529407]  [<ffffffff811abd69>] ? SyS_ioctl+0x79/0x90
[ 2727.529410]  [<ffffffff814f4f6a>] ? int_signal+0x12/0x17
[ 2727.529412]  [<ffffffff814f4cad>] ? system_call_fastpath+0x1a/0x1f
[ 2727.529413] ---[ end trace e99bbd501657ce98 ]---
[ 2727.553598] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20140825/37235104/attachment-0001.html>