Refresh rate stuck

  • Thread starter Thread starter Kevin Williams
  • Start date Start date
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Kevin Williams

Hello,

I've got a Dell P780 monitor and a Radeon 9600XT that have been
working well together for a couple years. I unplugged the PC and
attached the monitor to a couple of other PCs that I was working on
yesterday (all was well), and when I plugged the monitor back into my
main PC today and started it up, it wouldn't allow refresh rates greater
than 60 Hz at any resolution and detects the P780 as Default Monitor
(it's always been auto-detected as a P780 before). Forcing Windows to
use the P780 driver didn't help, nor did using ReForce. The same
situation on my Ubuntu 6.06 install--worked fine before, now nothing
more than 60 Hz (no other problems on either OS, though).

Plugged the monitor back into one of the two victim PCs and also
tried different resolutions; worked fine. Tried again on the main box:
same deal. It must be problem with the video card.

I've run a utility to grab the DDC info on Linux and it appeared to
give the correct information (not that I have a copy from before just
sitting around).

I've even tried unplugging both monitor and PC for a couple hours,
long enough for the capacitors to all discharge. I have no idea if that
would do anything worthwhile, but it seemed something to try.

All I can figure that was unusual is that I had the main PC sitting
around unplugged for several hours longer than it has in years. The
CMOS kept its values, however.

Help?
 
Kevin Williams said:
Hello,

I've got a Dell P780 monitor and a Radeon 9600XT that have been
working well together for a couple years. I unplugged the PC and
attached the monitor to a couple of other PCs that I was working on
yesterday (all was well), and when I plugged the monitor back into my
main PC today and started it up, it wouldn't allow refresh rates greater
than 60 Hz at any resolution and detects the P780 as Default Monitor
(it's always been auto-detected as a P780 before). Forcing Windows to
use the P780 driver didn't help, nor did using ReForce. The same
situation on my Ubuntu 6.06 install--worked fine before, now nothing
more than 60 Hz (no other problems on either OS, though).

Plugged the monitor back into one of the two victim PCs and also
tried different resolutions; worked fine. Tried again on the main box:
same deal. It must be problem with the video card.

I've run a utility to grab the DDC info on Linux and it appeared to
give the correct information (not that I have a copy from before just
sitting around).

I've even tried unplugging both monitor and PC for a couple hours,
long enough for the capacitors to all discharge. I have no idea if that
would do anything worthwhile, but it seemed something to try.

All I can figure that was unusual is that I had the main PC sitting
around unplugged for several hours longer than it has in years. The
CMOS kept its values, however.

Help?
Click to expand...

Did you try removing all monitors in Hardware Device Manager, then
"Look for new hardware"? That should re-enumerate the EDID.
 
In an Age long past, in an Age yet to come,
Not Gimpy Anymore said:
Did you try removing all monitors in Hardware Device Manager, then
"Look for new hardware"? That should re-enumerate the EDID.
Click to expand...

No help. ATI's control panel is saying it can't read the EDID
information and my only workaround is using that control panel to force
refresh rates.

I booted with my Ubuntu livecd and while it correctly detected both
vid card and monitor, it wouldn't go above 640x480 at 60 Hz, while a
livecd worked fine before.
 
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