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

Bryce Harrington bryce at bryceharrington.org
Sat Sep 29 06:23:09 UTC 2007


John, so yeah if you're seeing 'edidfail', then your bug is 94994.  I
recommend subscribing to that one.  I have some ideas on that one and am
hopeful we can knock it out next week; there's been some really good
successes the past couple weeks at solving some long standing resolution
bugs, and I think we're on a roll.  It would kick ass if we could
eliminate all these major resolution issues for Gutsy!

Demosthenes, try sudo apt-get install xresprobe; that should get
ddcprobe installed for you.

For those of you on this bug's mail list, the website address is
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/3731

The past day I've been going through and looking at hundreds of
resolution bugs.  It is astounding how many of them on close look turn
out to just be bug 27667 in one form or another.  I think that bug fix
by itself is going to go a long way towards remedying Ubuntu's
reputation for poor resolution detection support.  I hadn't expected
we'd be able to close so many of these resolution bugs until Hardy!

** 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
+   * Your hardware supports a variety of resolutions, but Ubuntu only runs in 640x480, 800x600, and/or 1024x768.  If you have all three resolutions, but expect more, you are likely seeing bug 27667, bug 49827, or bug 94994.
    * 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`.
+   * `sudo 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 `sudo xresprobe <driver> laptop`.  Also run `sudo ddcprobe` - if you see "edidfail" then you are experiencing bug 94994.
  
- The work-around for this bug is to edit /etc/X11/xorg.conf and replace
+ One 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.
  
  Alternatively, you can try running `sudo dpkg-reconfigure xserver-xorg`
  and specifying the refresh rates through that interface, if you wish to
  avoid hand editing config files.  Note that this will replace your
  xorg.conf file entirely.
  
- 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.
+ If you're running Gutsy, then you can also try the Screen and Graphics
+ GUI admin tool, which lets you reconfigure your xorg.conf in a graphical
+ manner.

** Tags removed: metabug

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