Red Hat Bugzilla – Bug 246645
horizontally squashed 1680x1050 display with g965, viewsonic Q20wb
Last modified: 2008-01-14 18:54:56 EST
Description of problem:
Both the OS and the monitor report that a 1680x1050 resolution is being used.
That's the correct resolution. Taking a screenshot, e.g., also produces a
1680x1050 resolution image. However, the image doesn't horizontally fill the
whole monitor; there's a large black band on the left side and a smaller band on
the right. Manual adjustment of the horizontal image size using the monitor's
menu doesn't help; setting the horizontal size to the maximum possible leaves
the image about the same.
I'm using the "intel" driver. The "i810" driver refuses to use 1680x1050 at all
(even after fooling with the bios table with 915resolution).
The monitor is a ViewSonic Q20wb.
Version-Release number of selected component (if applicable):
Thanks for the bug report. We have reviewed the information you have provided
above, and there is some additional information we require that will be helpful
in our diagnosis of this issue.
Please attach your X server config file (/etc/X11/xorg.conf) and X server log
file (/var/log/Xorg.*.log) to the bug report as individual uncompressed file
attachments using the bugzilla file attachment link below.
Could you please also try to run without any /etc/X11/xorg.conf whatsoever and
let X11 autodetect your display and video card? Attach to this bug
/var/log/Xorg.0.log from this attempt as well, please.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 158529 [details]
Created attachment 158530 [details]
OK, I renamed /etc/X11/xorg.conf. The result is an image that exactly fills the
whole screen (no more black bars on either side), but the resolution is now
1600x1200, which looks pretty awful on an LCD with native 1680x1050 resolution.
The "Screen Resolution" dialog doesn't give me the option of switching to
I'll attach the new log.
Created attachment 158533 [details]
Xorg.0.log (after removing xorg.conf)
This is the contents of /var/log/Xorg.0.log after renaming /etc/X11/xorg.conf,
logging out, and logging back in again.
I experimented with modelines, and found I could get an acceptable image with
HorizSync 31.5 - 90.0
VertRefresh 50.0 - 60.1
Modeline "JBF-1680x1050" 146.25 1680 1754 1930 2300 1050 1053 1059 1
089 +hsync -vsync
(The default mode otherwise selected is
"1680x1050" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
I know nothing about modelines, so this was found just by taking a mode out of
the log file and experimenting.
What needs to be done to get this working by default?
The log you posted seems to be from the i810 driver, rather than the intel
driver. Can you try the latter and see if it works for you? If not, it may
be having trouble getting EDID info from your monitor or the data is bogus...
Sorry for the confusion; I did have problems with both drivers, but I've lost
track of the details now.
I'm now using FC8 (not rawhide), for x86_64 (not 32-bit any more), with the same
machine (and same monitor), and the default setup (it seems to have chosen the
"intel" driver) no longer has any problems. This is just with the default
xorg.conf, no manual modeline setting.
Thanks for letting us know.