[Bug 3731] Re: Xorg resolution falling back to 640x480 and/or 800x600 when h/v freqs incorrect

[Bryce Harrington]

** Summary changed:

- Xorg resolution falling back to 640x480 when h/v freqs incorrect
+ Xorg resolution falling back to 640x480 and/or 800x600 when h/v freqs incorrect

** Description changed:

  I'm upgrade my system to ubuntu 5.10, after that, xorg can't load the
  correct resolution of the monitor ( 1024 x 768 ). I'ts only load
  640x480. I've used dpkg-recunfigure xserver-xorg, and insert the correct
  values, but don't work. The system is a Samsung 753dfx and a gforce mx
  200 32mb.
+ 
+ [Update]
+ A lot of people have reported this same bug.  Symptoms include:
+ 
+   * Your hardware supports a variety of resolutions, but Ubuntu only runs in 640x480, 800x600, and/or 1024x768
+   * In the "Monitor" section of /etc/X11/xorg.conf, your monitor is listed as "Generic Monitor", with HorizSync and VertRefresh rates that do not match your monitor
+   * `xresprobe <driver>` fails to work, or does not return accurate information for your hardware.  (You can find your driver by looking in /etc/X11/xorg.conf for the line "Driver ..."  It will be something like 'ati', 'nv', 'nvidia', etc.  If you are using this on a laptop, run `xresprobe <driver> laptop`.
+ 
+ The work-around for this bug is to edit /etc/X11/xorg.conf and replace
+ the rates with ones that match your monitor.  The section should look
+ something like this:
+ 
+ Section "Monitor"
+         Identifier      "Generic Monitor"
+         VendorName   "SNY"
+         ModelName    "SDM-S91"
+         Option          "DPMS"
+         HorizSync       28-80     # Important:  Use horizontal frequency for your monitor
+         VertRefresh     48-75     # Important:  Use vertical frequency for your monitor
+ EndSection
+ 
+ Your monitor's documentation will tell you what the frequencies are.
+ It's typically on a data sheet in the back of the book titled "Input
+ Signal" or similar.  If you don't have the printed manual, you can
+ usually also find it on the manufacturer's website.
+ 
+ The proper fix for this bug is to identify WHY xresprobe isn't working,
+ and for this we will need everyone's help.  Here are some ideas on why
+ it may or may not work, that need testing:
+ 
+   * Does it work with DVI monitors?
+   * Does it work with KVM switches?
+   * Does it work with DVI-to-VGA adapters?
+   * Does it work with HD monitors?
+   * Does it work with multi-headed systems?
+   * Does it work on non-x86 systems (AMD64, PPC64, et al)?
+ 
+ If you are having resolution problems, you can help by running xresprobe
+ (see above) and if it fails, then try to think of anything a-typical
+ about your system, and report your findings in the comments of this bug.

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Xorg resolution falling back to 640x480 and/or 800x600 when h/v freqs incorrect
https://bugs.launchpad.net/bugs/3731
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