Red Hat Bugzilla – Bug 235156
On-chip RMX mode cause video corrupt on IBM server
Last modified: 2009-06-19 12:31:45 EDT
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 support.
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 151641 [details]
while validate DFP modes, we matching modes from EDID info by default
#235157 is the duplicate of this one. sorry for the inconvenience.
Created attachment 153036 [details]
----- Additional Comments From firstname.lastname@example.org 2007-04-19 13:33 EDT -------
Patch from RedHat
Reverse mirror of an attachment
more information is available at upstream bugzilla:
Created attachment 153082 [details]
disable on-chip RMX using ddc_mode option
we would like to disable on-chip RMX by enable ddc_mode option. with this
modification, there will be minimal impact to the upstream Xorg.
when IBM Lewis server is detected, ddc_mode is automatically enabled, so the
on-chip RMX will be disabled for this machine.
Can you advise if this latest patch is acceptable for the next RH update? And
if so has it been scheduled?
*** Bug 235157 has been marked as a duplicate of this bug. ***
Looks fine to me. Devel ack, target for 5.2.
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
------- Comment From email@example.com 2007-10-04 12:05 EST-------
Greetings Red Hat Partner,
A fix for this issue should be included in the latest packages contained in
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