Red Hat Bugzilla – Bug 121717
can't change screen resolution / HorizSync/VertRefresh not uncommented in xorg.conf
Last modified: 2007-11-30 17:10:41 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7b) Gecko/20040316 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): system-config-display-1.0.13-3 How reproducible: Always 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.
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.
Created attachment 99708 [details] screenshot showing the double frame resulting from the bug
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
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.
This is due to libxf86config in xorg commenting these out by default (see bug 120950)
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. Solution #cp /etc/X11/xorg.conf.backup /etc/X11/xorg.conf
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.
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" EndSubSection # DefaultDepth 24 # SubSection "Display" # Depth 24 # Modes "1024x768" "800x600" "640x480" # EndSubSection EndSection
*** This bug has been marked as a duplicate of 120950 ***
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.