Bug 351781

Summary: X ignoring Modeline, VertRefresh and HorizSync options in xorg.conf
Product: Red Hat Enterprise Linux 5 Reporter: Mark Huth <mhuth>
Component: xorg-x11-drv-sisAssignee: Adam Jackson <ajax>
Status: CLOSED WONTFIX QA Contact: desktop-bugs <desktop-bugs>
Severity: low Docs Contact:
Priority: medium    
Version: 5.0CC: xgl-maint
Target Milestone: ---Keywords: Triaged
Target Release: ---   
Hardware: i686   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-03-09 22:40:29 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
Current xorg.conf with special settings
none
Log seems to show that video modes are automatically detected. However they aren't used. none

Description Mark Huth 2007-10-25 05:11:57 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.10) Gecko/20070312 Red Hat/1.5.0.10-2.el5 Firefox/1.5.0.10

Description of problem:
I have a customer who is having problems getting widescreen resolutions to work on their widescreen monitor.  It displays non-widescreen resolutions ok leaving 2 black sections down either side.  Graphics card is SiS, monitor is LG L204WT and using RHEL5.  I've attached xorg.conf and Xorg.0.log files.  xorg.conf files generated by system-config-display (various switches tried) and X -configure haven't had any impact.

Interestingly I got him to run 'xvidtune' and this allowed the screen to be filled.  Customer saved the settings generated by xvidtune in xorg.conf but when X restarts the settings are ignored.  He has to run xvidtune every time to get the screen filled again.  I can see similar settings being automatically detected in the Xorg.0.log file.

Version-Release number of selected component (if applicable):
xorg-x11-drv-sis-0.9.1-7-i386

How reproducible:
Always


Steps to Reproduce:
1. Start X.  Output is displayed incorrectly
2. Use 'xvidtune' to adjust the display to fill the screen.  Have xvidtune write out current video settings.
3. Put video settings in xorg.conf
4. Restart X.  Output reverts to previous settings.
5. xvidtune has to be re-run each time X starts.

Actual Results:
Special Modeline, VertRefresh and HorizSync settings in xorg.conf are ignored by X.  Output is displayed with 2 black sections down either side of the screen regardless of settings.

Expected Results:
Output should fill whole screen, preferably without having to fiddle with video mode settings.  It should 'just work' after setting the resolution in system-config-display or equivalent.

Additional info:
Sent an email to tech-list on 25/10/07 about this and Matěj Cepl recommended I file a bugzilla.
Comment 1 Mark Huth 2007-10-25 05:13:26 UTC 
Created attachment 237031 [details]
Current xorg.conf with special settings
Comment 2 Mark Huth 2007-10-25 05:15:15 UTC 
Created attachment 237041 [details]
Log seems to show that video modes are automatically detected.  However they aren't used.
Comment 3 Adam Jackson 2012-03-09 22:40:29 UTC 
sis driver almost certainly not going to get updated in RHEL5 at this point.  If this is still an issue in RHEL6, please reopen and update the product version to match.