down the LCD panel rabbit hole
fedora at logi.ca
Tue Aug 11 04:27:43 UTC 2009
On 08/10/2009 08:06 PM, brian wrote:
> On 08/10/2009 08:11 PM, Frank Cox wrote:
>> On Mon, 10 Aug 2009 19:38:20 -0400
>> brian wrote:
>>> SIS 661/741/760 PCI/AGP or 662/761Gx PCIE VGA
> Maybe I should clarify. As I mentioned in the original post, I've
> already found that site but am having a lot of trouble understanding
> much of it.
But thanks (a lot!) for the nudge, all the same. After re-reading
*carefully* that Sis driver site, and spending awhile poring over the
xorg.conf man page, the clue train finally arrived. It wasn't without
some issues, still, though, as I screwed up and had to go into rescue
mode a couple of times until I had the conf file squared away.
So, for anyone else who has similar trouble ...
The above-mentioned site suggests using a "blitter" mode for certain
chipsets if the system is using shared video memory. Indeed, Xorg.0.log
had a comment along those lines. This can be set as an option in xorg.conf.
The panel's user guide specifies a horiz. freq. of 55.62KHz, vert. freq.
of 49.92 Hz, and a sync polarity -H/+V for 1920 x 1080 resolution. So, I
edited xorg.conf to include:
# UseModes "1920x1080-55.62"
ModelName "DELL S2209W"
HorizSync 30.0 - 83.0
VertRefresh 50.0 - 76.0
ModeLine "1920x1080-55.62" 159.0 1920 2040 2240 2560 1080 1083 1088
1118 -hsync +vsync
Option "XvDefaultAdaptor" "Blitter"
# Modes "1920x1080-55.62"
Viewport 0 0
(The ModeLine was actually a Mode block--not a Mode Section!--that seems
to have been rewritten but whatever)
As I said, I was forced into rescue mode after a failed restart. I
checked /var/log/Xorg.0.log which told me that there was a:
Undefined Modes Section "1920x1080-55.62" referenced by Monitor "Screen0"
I commented out the Modes line in Display Subsection of the Screen
section (the manual says that it's optional) and rebooted. Same problem.
I went into rescue mode again and saw the same error. At this point, I
realised that the trouble was actually with the UseModes line of the
Monitor section. The manual clearly states that this refers to a Mode
section, not a Mode block ("multi-line entry"). I didn't have any Mode
Can you tell it's been a long day? Would you believe that I do a lot of
proofreading for a living? I kid you not.
Anyway, after another reboot, Fedora came up fine. The resolution still
looked a bit too low, though.
Monitor is correctly labelled as Dell S2209W
Refresh Rate: 60Hz
But resolution offered many choices now. I changed this to 1920x1080.
Likewise, I was able to change the refresh to 56Hz.
After the monitor blanked, my desktop was moved up and to the left, so I
could only just see the bottom right corner. I used the panel's
"auto-adjust" feature, and everything is now hunky-dory.
And I learned a lot about xorg.conf, which made it all worthwhile.
(ok, and the screen looks much better--let's not forget that.)
Thanks again, Frank, for the push I needed to give that site another go.
More information about the users