Red Hat Bugzilla – Bug 235157
On-chip RMX mode cause video corrupt on IBM server
Last modified: 2007-11-30 17:07:43 EST
Description of problem:
when install RHEL5-BETA2 on IBM Lewis server, video on local monitor is in
poor quality, and there is no video output on remote control.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.connect a monitor to server
2.log in to the remote control
3.install rhel5-beta2 and start X-windows
following modes on both local monitor and remote control should be OK.
vesa mode: 1024x768@75hz, 70hz,60hz
None of the above modes are OK.
on-chip RMX mode is only enabled when the driver thinks it’s driving a digital
panel which will cause poor quality on CRT. This is also an old day’s radeon
driver preference that probably shouldn’t be used any more because almost all
modern TMDS panels have internal scaler which usually can result in better
quality than our internal RMX.
in our case, radeon driver use RMX modes for remote video by default, however,
the stretched RMX modes can't be well supported.
To fix this bug, we can change digital pannel mode validation routine not to
use RMX mode by default, but validate modes by matching modes from EDID info
Created attachment 151642 [details]
while validate DFP modes, we matching modes from EDID info by default
duplicate of #235156, sorry for the inconvenience
please close this one.
*** This bug has been marked as a duplicate of 235156 ***