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!
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