Bug 672152

Summary: [Lenovo_Thinkstation_ventoux]there is no 1600x1200 resolution for DP outpu
Product: Red Hat Enterprise Linux 6 Reporter: wayneh <wayneh>
Component: xorg-x11-drv-vesaAssignee: Adam Jackson <ajax>
Status: CLOSED CURRENTRELEASE QA Contact: Desktop QE <desktop-qa-list>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.0CC: tpelka
Target Milestone: rcKeywords: Triaged
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-04-26 17:42:22 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Flags
DP port, no 1600x1200 none

Description wayneh 2011-01-24 08:24:04 UTC 
Description of problem:
it supports VGA&DP on the planar,there is no 1600x1200 resolution available when connecting the DP port.

Version-Release number of selected component (if applicable):


How reproducible:
connect the DP of the planar, there is only

Steps to Reproduce:
1: Install RHEL 6.0 64bit with OB DP (Dell 2408 or HP LP2475w)
2: Start X window
3: System-->Preferences-->Display-->Resolution
4: There are ONLY 4 resolutions.(640x480/800x600/1024x768/1280x1024)
5: Change to D-sub,the max resolution is 1600x1200
  
Actual results:
when connecting to the DP port,there is no 1600x1200 resolution available in the list.

Expected results:
when connecting to the DP port,there is a same resolution list as connecting VGA port.

Additional info:
kernel:2.6.32-71.el6.x86_64
Intel Sandy Bridge & Cougar Point Based Platforms
Comment 1 wayneh 2011-01-24 08:24:57 UTC 
Created attachment 474915 [details]
DP port, no 1600x1200
Comment 3 RHEL Program Management 2011-01-24 08:48:20 UTC 
This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unfortunately unable to
address this request at this time. Red Hat invites you to
ask your support representative to propose this request, if
appropriate and relevant, in the next release of Red Hat
Enterprise Linux. If you would like it considered as an
exception in the current release, please ask your support
representative.
Comment 5 Adam Jackson 2011-08-17 13:44:51 UTC 
This is expected.  DP->VGA converters typically only have 2 lanes wired, and thus have a maximum pixel clock of 144MHz for 8bpc, which is too low for any common 1600x1200 mode.

This is fixable by dithering to 6bpc, and while a patch to achieve this has been posted upstream it is not yet merged.

Moving to 6.3 radar.
Comment 6 Adam Jackson 2011-10-19 17:49:34 UTC 
Patch tested and working, devel ack for 6.3.
Comment 9 Suzanne Logcher 2012-02-14 23:06:16 UTC 
This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unfortunately unable to
address this request at this time. Red Hat invites you to
ask your support representative to propose this request, if
appropriate and relevant, in the next release of Red Hat
Enterprise Linux. If you would like it considered as an
exception in the current release, please ask your support
representative.
Comment 10 Adam Jackson 2012-04-26 17:42:22 UTC 
Should be fixed in 6.3.