Bug 812309

Summary: DP is not recognized on SandyBridge
Product: Red Hat Enterprise Linux 6 Reporter: Tomas Pelka <tpelka>
Component: kernelAssignee: Dave Airlie <airlied>
Status: CLOSED CANTFIX QA Contact: Desktop QE <desktop-qa-list>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.3CC: jkoten, lyude
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-11-10 18:17:12 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Attachments:
Description Flags
xrandr output
none
xorg log
none
dmesg none

Description Tomas Pelka 2012-04-13 10:51:28 UTC
Description of problem:
Intel driver is not able to recognize DP.

Version-Release number of selected component (if applicable):
xorg-x11-drv-intel-2.16.0-1.el6
kernel-2.6.32-259.el6
xorg-x11-server-Xorg-1.10.6-1.el6
xorg-x11-drv-nouveau-0.0.16-13.20110719gitde9d1ba.el6


How reproducible:
100%

Steps to Reproduce:
1. boot system with only Intel enabled
2. try to connect monitor to DP
3.
  
Actual results:
no output

Expected results:
not sure if it should be enabled or shared between two graphics

Additional info:
nor ALSA is not able to recognize audio output for it

this system have two graphics, Intel and discrete Nvidia. Discrete graphic is disabled in BIOS

Comment 1 Tomas Pelka 2012-04-13 10:52:37 UTC
Created attachment 577296 [details]
xrandr output

Comment 2 Tomas Pelka 2012-04-13 10:53:08 UTC
Created attachment 577297 [details]
xorg log

Comment 3 Tomas Pelka 2012-04-13 10:53:57 UTC
Created attachment 577298 [details]
dmesg

Comment 4 Tomas Pelka 2012-04-13 11:10:48 UTC
When discrete card enabled than system can see the DP out, but I'm not able to detect a monitor in g-d-p.

01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF119 [Quadro NVS 4200M] [10de:1057] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device [17aa:21cf]
	Flags: bus master, fast devsel, latency 0, IRQ 16
	Memory at f2000000 (32-bit, non-prefetchable) [size=16M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	Memory at f0000000 (64-bit, prefetchable) [size=32M]
	I/O ports at 5000 [size=128]
	Expansion ROM at f3080000 [disabled] [size=512K]
	Capabilities: <access denied>
	Kernel driver in use: nouveau
	Kernel modules: nouveau, nvidiafb

Comment 5 Tomas Pelka 2012-04-13 11:11:21 UTC
Just note that VGA works fine.

Comment 6 Tomas Pelka 2012-04-13 11:21:43 UTC
Info about Intel:

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device [17aa:21d1]
	Flags: bus master, fast devsel, latency 0, IRQ 24
	Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 5000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: i915
	Kernel modules: i915

Comment 7 Adam Jackson 2012-04-17 18:48:15 UTC
Yeah, that's going to not work.  GPU-switching setups like that simply don't wire the DP (or any external digital port in fact) to the Intel chip.

Moving to 6.4, we might have prime support in working shape by then.

Comment 8 Adam Jackson 2012-04-17 18:48:34 UTC
Fix assignee.

Comment 9 RHEL Product and Program Management 2012-07-10 08:54:56 UTC
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Comment 10 RHEL Product and Program Management 2012-07-10 23:36:20 UTC
This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development.  This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4.

Comment 11 RHEL Product and Program Management 2012-12-14 08:52:13 UTC
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Comment 12 Lyude 2015-11-06 22:46:43 UTC
Still present in 6.7, also reproduced using an upstream kernel.

Comment 13 Dave Airlie 2015-11-09 20:10:51 UTC
If you disable the NVIDIA nothing is connected to the displayport port as there is no mux on that.

So it's working as designed AFAICS, even if designed is broken.

Comment 14 Lyude 2015-11-10 18:17:12 UTC
originally kept this open because I could reproduce the issue on the nvidia card, however upon further inspection it turns out two of our mini displayport to displayport adaptors were actually broken, and using a third one fixed the problem. Closing