Red Hat Bugzilla – Bug 17069
ATI M4 video on LCD not defaulting to 60Hz
Last modified: 2008-05-01 11:37:58 EDT
Dell Inspiron 8000 w/ ATI M4 video & sxga+ 1400x1050 LCD
RC2 + updated kudzu, Xconfigurator, + XFree86
When running Xconfigurator, if you let it probe, it wants to run
1024x768x8bit color which will not work.
If you manually select the 1400x1050, the sample X screen looks ok,
however, when you save the configuration & startx, the screen is garbled.
Manually editing the XF86Config-4 file the vertical refresh is set to
70Hz. If you change it to 60Hz, it works fine.
Probe is not a good solution for it (known, will be fixed in Xconfigurator
rewrite). As for the difference is between the sample screen and the final
screen, there shouldn't be any so I would love to know.
What do you change in the file?
The only thing I edit is the vertical refresh & change from 70Hz to 60Hz
Exactly what do you change? What are the original lines, what are the new
Hmmm well it looks like I may have listed a bit of mis-information (sorry...),
but I am not able to repeat exactly as above today.
When NOT probing, and choosing the Generic 1400X LCD, when you get to the
selection process for resolution & color depth, 1400x1050 is not an option. I
can choose 1024x768 or 1280x1024 and when the test comes up it is distorted
however, you can still click the yes button to accept it. Then edit the
XF86Config-4 and change:
"VertRefresh" from 50-70 to 50-60
AND Change Screen section to look like this:
Would this change in general be a good thing for this LCD screen? We don't have
access to any hardware like this...
*** Bug 15190 has been marked as a duplicate of this bug. ***
*** Bug 16533 has been marked as a duplicate of this bug. ***
Sorry for the lack of updates on my part. 60Hz is ok on most of our LCD's. At
this point I have received more hardware to work with that is not prototype.
It looks like we have to add custom mode lines to get some of these LCD's
working now. Also, I understand this driver is not supposed to work with 32bit
color depth. I will attach all the XF86Config-4 files for our different panel
Created attachment 6050 [details]
XF86Config-4 for 1024x LCD
Created attachment 6051 [details]
XF86Config-4 for 1280x LCD
Created attachment 6053 [details]
XF86Config-4 for 1400x LCD
Created attachment 6054 [details]
XF86Config-4 for 1600x LCD
Dan: I'm adding entries for these monitors to the monitor database, but would
you possibly be able to provide me with a windows .inf for these monitors or at
least the EDID ID strings associated with each monitor? This would greatly aid
monitor definitions added.