Re: X woes - can't set the correct resolution no matter what...

On 7/23/07, Phil Meyer <pmeyer@xxxxxxxxxxxxxxxx> wrote:
Valent Turkovic wrote:
On 7/12/07, Phil Meyer <pmeyer@xxxxxxxxxxxxxxxx> wrote:

Valent Turkovic wrote:

Hi.

I have Fedora Core 6 and by default it choose i810 driver for X for my
Intel 915 chip.
With i810 driver I had no problem using only my laptop screen - but when
I connected external 19" screen all hell broke loose :) to be a bit
poetic. or more to the point:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=238747

In my comment #8 you can see that I changed to intel driver, but even
that still doesn't work like I expect.

I need my external monitor running at it's full resolution of
1280x1024 and desktop also at that resolution. I got desktop running
with 1280x1024 but only on a 1024x768 screen resolution

It is probably not the driver, but your external monitor that has a problem.

One of the things that most of the current video drivers do is ask the
monitor for its EDID. In this data, the monitor reports its max
Horizontal avd Vertical scan rates. Look in /var/log/Xorg.0.log for
EDID. Here is an example:

(II) VESA(0): Year: 2006 Week: 0
(II) VESA(0): EDID Version: 1.3
(II) VESA(0): Digital Display Input
(II) VESA(0): Max H-Image Size [cm]: horiz.: 37 vert.: 23
(II) VESA(0): Gamma: 2.20
(II) VESA(0): No DPMS capabilities specified; RGB/Color Display
(II) VESA(0): First detailed timing is preferred mode
(II) VESA(0): redX: 0.614 redY: 0.353 greenX: 0.321 greenY: 0.561
(II) VESA(0): blueX: 0.152 blueY: 0.124 whiteX: 0.313 whiteY: 0.329
(II) VESA(0): Manufacturer's mask: 0
(II) VESA(0): Supported additional Video Mode:
(II) VESA(0): clock: 162.0 MHz Image Size: 367 x 230 mm
(II) VESA(0): h_active: 1920 h_sync: 1968 h_sync_end 2000 h_blank_end
2160 h_border: 0
(II) VESA(0): v_active: 1200 v_sync: 1201 v_sync_end 1204 v_blanking:
1250 v_border: 0

If you scroll down through the log, you can see where all possible
resolutions are gone through and it may even tell you why it decided on
1024x768.

There are monitors that give bad data in the EDID (DDC). For instance,
the old version of the DELL 24" display was .1 (yes point 1) off, and
therefore by default no driver would go above 1600x1200. With that
monitor it was necessary to tell the video driver to ignore the EDID
data and simply do what was asked. :)

Here is how that is done:

Add values to the Monitor section that are at least capable of the
resolution you need.

Section "Monitor"
...
HorizSync 31.5 - 90.0
VertRefresh 60.0 - 60.0
...

Now, in the screen section, tell it to ignore that part of the the EDID.

Section "Screen"
...
Option "ModeValidation" "NoMaxPClkCheck"
...

Hope this may help ya.

Good luck!


Thank you very much! I will try this out as soon as I get to work on monday.
Few days ago I tried something else; I switched from i810 to intel
driver in Xorg.conf and now when I boot up my laptop I get 1024x768 on
both my 15" laptop screen and external 19" Samsung LCD.

How can I setup so that I have my laptop running at 1024x768 and my
Samsung running at 1280x1024 resolution?

I would like to make external screen my default desktop when both of
them are attached but when I boot with only laptop screen then I would
(obviously) like that my laptop screen doesn't freak out and that it
know that it is now the main screen.

It this possible?



Most laptops have a CRT/LCD tag on a function key.

For example, on mine it is on F8.

I can connect an external monitor before turning on the laptop.

As soon as the Grub menu shows, press FN and F8 together. This switches
the video to the external monitor. I simply close the lid on the laptop
and ignore it for that that session, because I also have it connected to
an external USB keyboard and mouse.

When X Windows starts, it sees the external monitor only, and will try
to adjust to the max resolution supported by the video card and
monitor. You shouldn't have to do anything.

After X Windows is running, the FN combination keys are grabbed by X and
are not defined the same, so you have to do the 'switch' before X starts.


Good Luck!


Hi I still ZERO success even with your great tips.

I have IBM Thinkpad R52 and with external monitor connected on boot I
have grub only on external LCD. But during the boot internal LCD on
laptop also goes on and when I'm presented GDM to login to my Fedora
Core 6 I have picture on both monitors.

I tied your tips and pressing FN-F7 twice so that I get grub only on
laptop and then again only on external LCD and then closing the lid (I
have wireless USB keyboard)... but that still didn't work!

I have this xorg.conf file:

# cat /etc/X11/xorg.conf
# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Synaptics" "CorePointer"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "hr"
EndSection

Section "InputDevice"
Identifier "Synaptics"
Driver "synaptics"
Option "Device" "/dev/input/mice"
Option "Protocol" "auto-dev"
Option "Emulate3Buttons" "yes"
EndSection

Section "Monitor"

### Comment all HorizSync and VertSync values to use DDC:
Identifier "Monitor0"
ModelName "LCD Panel 1280x1024"
### Comment all HorizSync and VertSync values to use DDC:
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
Option "dpms"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "intel"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" "800x600" "640x480"
# Modes "1280x800" "1152x864" "1152x768" "1024x768" "800x600"
Option "ModeValidation" "NoMaxPClkCheck"
EndSubSection



and If I enable "1280x800" mode I get desktop of 1280x800 but I get
resolution of 1024x768 and I can pan around the bigger desktop...
really not what I had in mind :)

Do you please have any others ideas?

Thank you again.


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