| Summary: | [DP] [BDW] dp to VGA dongle works intermittently | ||||||
|---|---|---|---|---|---|---|---|
| Product: | DRI | Reporter: | Carl Michal <michal> | ||||
| Component: | DRM/Intel | Assignee: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||
| Status: | CLOSED FIXED | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||
| Severity: | normal | ||||||
| Priority: | medium | CC: | intel-gfx-bugs | ||||
| Version: | unspecified | ||||||
| Hardware: | x86-64 (AMD64) | ||||||
| OS: | Linux (All) | ||||||
| Whiteboard: | |||||||
| i915 platform: | BDW | i915 features: | display/DP | ||||
| Attachments: |
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Description
Carl Michal
2016-06-23 18:14:32 UTC
Please try current drm-intel-nightly kernel from http://cgit.freedesktop.org/drm-intel Created attachment 126637 [details]
dmesg trace with Apple VGA dongle, using drm-intel-nightly Sept 19
I built the drm-intel-nightly kernel, but sadly it doesn't seem to improve things for the VGA dongles. dmesg trace attached.
Information provided, moving bug back to New Hello, I tried to reproduce this issue but i was unable to get it, maybe it could be a problem with the projector or with the dongles.
this is my current configuration:
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Graphic stack
======================================
======================================
Software
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kernel version : 4.12.0-rc3-drm-tip-ww22-commit-187376e+
architecture : x86_64
os version : Ubuntu 17.04
os codename : zesty
kernel driver : i915
bios revision : 5.6
bios release date : 05/11/2017
======================================
Graphic drivers
======================================
mesa : 17.0.3
modesetting : modesetting_drv.so
xorg-xserver : 1.19.3
libdrm : 2.4.81
cairo : 1.14.8
xserver : X.Org X Server 1.19.99.1
intel-gpu-tools (tag) : intel-gpu-tools-1.18-211-g00ce341b
intel-gpu-tools (commit) : 00ce341b
======================================
Hardware
======================================
platform : BDW
motherboard id : NUC5i7RYB
form factor : Desktop
cpu family : Core i7
cpu family id : 6
cpu information : Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
gpu card : Intel Corporation Iris Graphics 6100 (rev 09) (prog-if 00 [VGA controller])
memory ram : 15.58 GB
max memory ram : 16 GB
display resolution : 1600x900
cpu thread : 4
cpu core : 2
cpu model : 61
cpu stepping : 4
socket : Socket BGA1168
signature : Type 0, Family 6, Model 61, Stepping 4
hard drive : 111GiB (120GB)
current cd clock frequency : 337500 kHz
maximum cd clock frequency : 540000 kHz
displays connected : DP-1
======================================
Firmware
======================================
======================================
kernel parameters
======================================
quiet splash fastboot drm.debug=0xe
Carl could you try with the latest kernel xorg-server?
Regards.
I haven't tried this in a long time - I've been able to use hdmi generally - and its always been reliable. This computer now has a 4.11.3 kernel on it. I went down to the lecture theatre just now with the apple VGA dongle and the situation is pretty different from when I first posted this. In all of the rooms where I could reproduce the problem, the projector switching system has been recently upgraded, so the newer kernel isn't the only difference. At the moment though, the apple dongle seems to work fine, as long as the dongle is plugged into the projector switch before its plugged into the laptop. If you plug the dongle in to the computer first, then plug the VGA cable in to the dongle afterwards, it doesn't work. If you'd like traces of those I can post them. (In reply to Carl Michal from comment #5) > I haven't tried this in a long time - I've been able to use hdmi generally - > and its always been reliable. > > This computer now has a 4.11.3 kernel on it. I went down to the lecture > theatre just now with the apple VGA dongle and the situation is pretty > different from when I first posted this. In all of the rooms where I could > reproduce the problem, the projector switching system has been recently > upgraded, so the newer kernel isn't the only difference. Hello Carl, Since all the configuration had changed already, it seems really hard to point a culprit now. > > At the moment though, the apple dongle seems to work fine, as long as the > dongle is plugged into the projector switch before its plugged into the > laptop. If you plug the dongle in to the computer first, then plug the VGA > cable in to the dongle afterwards, it doesn't work. > About the dongle, seems more probably that the cable or the dongle are the cause of the problem than any SW configuration. I recommend to try a different cable and dongle to see if the problem is caused for those ones. If the problem is not present anymore, please change the status to RESOLVED. Thank you. I can't really object to closing this since I can't reproduce it. I don't think this was a cable or dongle problem since it appeared with two different dongles in a couple of different lecture theatres, and all of the same hardware worked without any problems in windows. If I see the problem again and can reproduce it I'll open a new bug. |
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