Unexpected screen resolution

[Marco Hunsicker]

I've installed Dapper Flight 4 using the provided ISO image. Installation was effortless (I've chosen custom partitioning, dual-booting Windows XP). Nice!

After the installation finished, I did a reboot and the GNOME login manager appeared. But sadly with a wrong screen resolution. I'm running a 24'' LCD, but only 1600x1200 were occupied, black stripes appeared on both sides.

Now it's no biggie, I've manually added the native resolution to the xorg.conf, restarted GNOME and everything was fine. But I'd thought I'll let you know.

I'm using a DELL 2405FPW, connected via DVI with an ASUS N6200/TD (AGP), capable to display 1920x1200. Installation was done using the i386 ISO on a home build AMD Athlon XP.

Please let me know, if you need any more information or have instructions what could be tried during installation in order to have the correct resolution detected right away. As I said, the system runs fine after some custom configuration changes. Thank you.

Regards,

[Matthew Lange (matthewlange)]

Similar to Bug #5801?

[Jerome S. Gotangco (jsgotangco)]

Please attach Xorg.0.log and xorg.conf. Thanks

Jerome

[Marco Hunsicker (ubuntu-triemax)]

I've just installed a fresh Ubuntu 6.06_01 and the problem still appears. I'm attaching the requested files. Thanks much for taking the time to look into this

[Marco Hunsicker (ubuntu-triemax)]

The specifications of the used monitor are available from the Dell web site:
http://support.euro.dell.com/support/edocs/monitors/2405fpw/en/about.htm#Specifioications

Some information quoted below.

General
 Model number 2405FPW

Flat Panel
 Screen type Active matrix - TFT LCD
 Screen dimensions 24 inches (24-inch diagonal viewable image size)

Preset display area:
 Horizontal 518.4 mm (20.4 inches)
 Vertical 324.0 mm (12.7 inches)
 Pixel pitch 0.270 mm
 Viewing angle +/- 89 (vertical) typ, +/- 89 (horizontal) typ
 Luminance output 500 cd/m (typ)
 Contrast ratio 1000:1 (typ)
 Faceplate coating Antiglare with hard-coating 3H
 Backlight 6 CCFLs U-type backlight
 Response Time 12ms typical (Grey to Grey) / 16ms typical (Black to White)

Resolution
 Horizontal scan range 30 kHz to 81 kHz (automatic)
 Vertical scan range 56 Hz to 76 Hz, exception 1680 x 1200 & 1920 x 1200 at 60 Hz
                                                                                                                                  only

Optimal preset resolution
 Analog : 1920 x 1200 at 60 Hz(VESA CVT-R Mode)
 Digital : 1920 x 1200 at 60 Hz(VESA CVT-R Mode)

Highest preset resolution
 Analog : 1920 x 1200 at 60 Hz(VESA CVT-R Mode)
 Digital : 1920 x 1200 at 60 Hz(VESA CVT-R Mode)

Preset Display Modes
Display Mode Horizontal Frequency (kHz) Vertical Frequency (Hz) Pixel Clock (MHz) Sync Polarity (Horizontal/Vertical)
VGA, 720 x 400 31.5 70.1 28.3 -/+
VGA, 640 x 480 31.5 59.9 25.2 -/-
VESA, 640 x 480 37.5 75.0 31.5 -/-
VESA, 800 x 600 37.9 60.3 40.0 +/+
VESA, 800 x 600 46.9 75.0 49.5 +/+
VESA, 1024 x 768 48.4 60.0 65.0 -/-
VESA, 1024 x 768 60.0 75.0 78.8 +/+
VESA, 1152 x 864 67.5 75.0 108.0 +/+
VESA, 1280 x 1024 64.0 60.0 108.0 +/+
VESA, 1280 x 1024 80.0 75.0 135.0 +/+
VESA, 1600 x 1200 75.0 60.0 162.0 +/+
VESA, 1920 x 1200 74.0 60.0 154.0 +/-