Bug 87423 - Display port not working with i915/intel
Summary: Display port not working with i915/intel
Status: CLOSED NOTABUG
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-12-17 21:35 UTC by Martin Monperrus
Modified: 2017-07-24 22:49 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments

Description Martin Monperrus 2014-12-17 21:35:53 UTC 
On my HP EliteBook 820, the display port is not working (not seen as connected in xrandr).

It may be related to the following kernel error:
acpi PNP0501:00: Still not present
i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment


Info:
$ uname -a
Linux beethoven 3.16-2-amd64 #1 SMP Debian 3.16.3-2 (2014-09-20) x86_64 GNU/Linux

$ dpkg -l xserver-xorg-video-intel
ii  xserver-xorg-video-intel    2:2.21.15-2+b2     amd64              X.Org X server -- Intel i8xx, i9xx display driver
Comment 1 Ander Conselvan de Oliveira 2014-12-18 07:33:46 UTC 
It's more likely this is a kernel issue. Please boot your kernel with drm.debug=14 in its command line, and then attach the full dmesg to this bug. Also, can you test if the bug is still present with the latest drm-intel-nightly kernel?
Comment 2 Martin Monperrus 2014-12-18 15:47:30 UTC 
The display port is working, there was a bad interplay between VGA referred to as DP2 and the actual display port on DP1.

Why is the VGA port called DP2? and not VGA or VGA1?
Comment 3 Jani Nikula 2014-12-19 08:36:38 UTC 
(In reply to Martin Monperrus from comment #2)
> Why is the VGA port called DP2? and not VGA or VGA1?

It sounds like there's a DP->VGA converter somewhere, and to the graphics hardware it is a display port. Hard to be sure without details.

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