Red Hat Bugzilla – Bug 433879
resolution is wrong on primary display with external monitor plugged in when X starts on t60w
Last modified: 2008-04-03 10:52:43 EDT
Description of problem:
If I have an external display plugged in when X starts, the resolution is wrong
on the primary display, but correct on the external
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. plug in external display
2. boot computer/start X
Resolution is correct for external display, but incorrect for primary display
both displays have correct resolution
The external display has a lower maximum resolution than my primary display.
information about the system are NEEDINFOed in bug 433875
see attachment in bug 433875
That’s attachment 295634 [details]
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
The i945GM should be driven by the intel driver. That log shows it being driven
by the i810 driver. Why are you doing that?
I will retest with intel driver.
With the intel driver, the external display and primary display are lit when X
starts. The resolution is correct for the external display. Primary is the
same resolution as external which is wrong for it. Fn-f7 does not change
anything. Both screens just blank for a second.
This request was previously evaluated by Red Hat Product Management
for inclusion in the current Red Hat Enterprise Linux release, but
Red Hat was unable to resolve it in time. This request will be
reviewed for a future Red Hat Enterprise Linux release.
More information. External display happens to only do 1280x800. LVDS can do up
to 1680x1050. With latest driver package (xorg-x11-drv-i810-1.6.5-184.108.40.206.el5)
The resolution is correct on LVDS (1680x1050) and the external display only
shows part of the desktop. I am still unclear if the resolution will ever be
correct on both displays if they differ in max resolution.
Got more clarification about expected results. X may choose a resolution that
is bigger that can be displayed on the LVDS. The is sub optimal but expected in
some cases. As long at the external display is showing the full screen then
this it not a problem.
I am going to consider this bug closed and open other bugs that are hardware
specific for results that vary my new understanding of the expected results.