Bug 121717 - can't change screen resolution / HorizSync/VertRefresh not uncommented in xorg.conf
Summary: can't change screen resolution / HorizSync/VertRefresh not uncommented in xor...
Status: CLOSED DUPLICATE of bug 120950
Alias: None
Product: Fedora
Classification: Fedora
Component: system-config-display
Version: rawhide
Hardware: i686
OS: Linux
Target Milestone: ---
Assignee: Brent Fox
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 2004-04-26 19:02 UTC by Captain
Modified: 2007-11-30 22:10 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2006-02-21 19:02:47 UTC
Type: ---

Attachments (Terms of Use)
screenshot showing the double frame resulting from the bug (19.10 KB, image/jpeg)
2004-04-27 01:13 UTC, Tino Meinen
no flags Details

Description Captain 2004-04-26 19:02:24 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7b)

Description of problem:
I installed FC2test3, rebooted and X config came up. I selected
1024x768, but GNOME came up with 800x600.
system-config-display only showed 800x600 and 640x480.
No chance to get it working with 1024x768 (even selected a default
monitor [1024x768] and edited xorg.conf - added "1024x768" for the
default depth)

Graphics card: ATI Mach64VT
Monitor: Siemens Nixdorf MCM 1702

# system-config-display
* ddcprobe returned bogus values:
ID: SNIcc0b
Name: SNIcc0b
HorizSync: None
VertSync: None

Trying with card: ATI Mach64VT (264VT)

# kudzu --probe --bus=DDC
class: VIDEO
bus: DDC
detached: 0
driver: unknown
desc: "ATI Technologies Inc. MACH64VT"
mem: 2048
class: MONITOR
bus: DDC
detached: 0
driver: unknown
desc: "(null)"
id: SNIcc0b
mode: 800x600
mode: 1024x768
mode: 1152x864
mode: 640x480
mode: 800x600
mode: 1024x768

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

How reproducible:

Steps to Reproduce:
1. install FC2test3
2. select 1024x768 in the X configuration
3. graphical login, KDE and GNOME comes up in 800x600

Actual Results:  Couldn't change the screen resolution to 1024x768

It is reproducable no matter how often I run system-config-display,
but I haven't tried another install...

Expected Results:  system-config-display should have at least the
option 1024x768 which I chose during the X configuration

Additional info:

I solved the problem by editing xorg.conf again and uncommenting the
lines for HorizSync and VertRefresh.

I believe it is a bug in system-config-display, since xorg.conf is
created by it.

Comment 1 Forrest 2004-04-26 19:11:57 UTC
I have the same problem.  I had to manually uncomment the H&Vsync
options because my machines are on a KVM switch.  The DDC probe
doesn't work, so I have to manually specify the monitor.

This would be a Bad Thing if this is going to be the default.  Most
people at our company use KVM switch boxes, and I don't really want to
have to manually change the conf file on each installation.

Comment 2 Tino Meinen 2004-04-27 01:13:11 UTC
Created attachment 99708 [details]
screenshot showing the double frame resulting from the bug

Comment 3 Tino Meinen 2004-04-27 01:13:53 UTC
Same problem here, resulting in a double frame display, with the lower
half not sensitive to the mouse.
Taking a screenshot, reveals the hole desktop however, so I attach a
fotograph from my monitor. (iiyama vision master pro510)
The was correctly detected by the configurator.

Uncommenting the two Hsync en Vsync lines resolves the problem

Tino Meinen

Comment 4 François Kooman 2004-04-27 22:53:32 UTC
The DDC probe doesn't seem to work with my notebook as well (Toshiba
Satellite Pro 6100: P4, Geforce 4 Go 420,1024x768 TFT panel)
Uncommenting the two Hsync en Vsync lines resolved the problem for me too.

Comment 5 Jeremy Katz 2004-04-28 01:16:36 UTC
This is due to libxf86config in xorg commenting these out by default
(see bug 120950)

Comment 6 Olu Akins 2004-04-30 12:15:18 UTC
I had the same problem on my notebook but xorg detected the right
resolution. Comparing /etc/X11/xorg.conf and /etc/X11/xorg.conf.backup
shows that the xorg.conf.backup has the Hsync and Vsync uncommented.

 #cp /etc/X11/xorg.conf.backup /etc/X11/xorg.conf

Comment 7 Max Kessler 2004-05-02 01:52:38 UTC
Same problem with CyberBlade (Generic) and Iiyama VisionMaster
MF-8317.  I routinely use 1024x768, which even works under that
glass-thingy OS.  FC2 test 2 was able to use the same resolution.

I'm also using a KVM switch, but that should be irrelevant, since it
detected the video card correctly and I specified the monitor in Anaconda.

Firstboot gave me an option of 640x480 or 800x600.  I figured I would
have to manually tweak the setting afterward, so I selected 800x600. 
It booted into 640x480 instead.  After manually editing the xorg.conf
file to specify 1024x768 it boots into 800x600.

Comment 8 Nico Kadel-Garcia 2004-05-05 20:02:02 UTC
I found similar behavior on the Sony Vaio PCG-SRX77P. The workaround 
is to hand-edit the /etc/X11/xorg.conf and inform it gently, that the 
DefaultDepth is 16 and change the Display settings to support 16-bit 
resolution, something like the excerpt below.

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     16
        SubSection "Display"
                Depth     16
                Modes    "1024x768" "800x600" "640x480"
#       DefaultDepth     24
#       SubSection "Display"
#               Depth     24
#               Modes    "1024x768" "800x600" "640x480"
#       EndSubSection

Comment 9 Mike A. Harris 2004-05-07 13:44:12 UTC

*** This bug has been marked as a duplicate of 120950 ***

Comment 10 Red Hat Bugzilla 2006-02-21 19:02:47 UTC
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.

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