Red Hat Bugzilla – Bug 63588
Can get only 60Hz refresh on i810
Last modified: 2007-04-18 12:42:02 EDT
Description of Problem:
X only sets the i810 to 60Hz refresh on a Dell Optiplex GX110. I know it is
capable of higher refresh, b/c windows can do so.
Version-Release number of selected component (if applicable):
XFree86-4.2.0-6.52 on Skipjack-BETA2
Steps to Reproduce:
1. Run XConfigurator
2. Select 'custom' monitor, and highest refresh rates possible
3. Start X server
Only get 60Hz refresh.
XFree86 comes with a set of VESA GTF standard modelines which are used by all
hardware. The X server and drivers automatically choose modelines with the
highest refresh rate for the monitor, and video mode, etc. However, this is
not necessarily the highest refresh rate the hardware can _do_, but rather
the highest refresh rate that X has built in for a given mode.
If you want to use refresh rates beyond what XFree86 has built in, you need
to generate the modelines yourself and add them to the X config file, the
details of which are beyond the scope of what bugzilla is for.
You can try http://xtimings.sf.net for creating new modelines.
For the record, Windows can do higher refresh rates because it is not
something to do with the operating system, but with the video drivers, and
the Windows video drivers come with higher refresh rate modelines than
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