Red Hat Bugzilla – Bug 222328
video driver i810 with 1440x900. using 915resolution sets wrong timings - image shifted
Last modified: 2008-03-19 04:14:25 EDT
Description of problem:
915resolution sets wrong horizontal and vertical synchronization times if the
Bios type is 2 or 3. I modified 915resolution to fix this problem.
This occured for a Dell Dimension 3000 with integrated Intel graphics controller
865G, and using the video driver i810. I tried to set the video mode for
1440x900@60 Hz in xorg.conf as
Modeline "1440x900" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
and the bios is patched using (/etc/rc.local):
915resolution 1440 900 16 1904 934
It is then possible to select this mode and the screen is clear. However, the
screen is shifted by about 50 mm to the right which is too far for some monitors
to adjust. (I use a Samsung 940BW monitor).
Version-Release number of selected component (if applicable):
915resolution Version 0.5.2 and higher.
Steps to Reproduce:
1. use Modeline "1440x900" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync
put 915resolution 1440 900 16 1904 934
and similar into /etc/rc.local
2. one needs a monitor capable of 1440x900 (widescreen) I used Samsung 940BW
Actual results: Image on the screen shifted far to the right, unadjustable.
Expected results: crisp image and centered.
Additional info: I have a patch for 915resolution. The discussion is
See also the attached modified version hacked915resolution.c
Created attachment 145376 [details]
Created attachment 145720 [details]
tar.gz file containing hacked915resolution.c, README, and Makefile
0.5.3 was just built and released. Does it resolve your problems, by any chance?
Sorry didn't get to this. I'm still using my hacked915resolution. I'm a little
hesitant to get into this right now as I'm quite busy with other stuff. However,
I had a look at the source of the new version 5.3 just now and see that there are
now actual timing calculations in the program replacing my hack by a clean new
function gtf_timings() - That's great. At the moment I admit I don't even
remember how to go back to using 915resolution. I want to use it when I upgrade
to the soon coming FC7.