Mailinglist Archive: radeonhd (308 mails)

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[radeonhd] Re: External display goes black when setting to native resolution
  • From: "Leif Gruenwoldt" <leifer@xxxxxxxxx>
  • Date: Mon, 17 Mar 2008 13:18:00 -0400
  • Message-id: <596b55b40803171018l5bae906ep249fd0b46449439d@xxxxxxxxxxxxxx>
Ok I found a workaround.

I used the tool `gtf` to generate a modeline. I noticed the pixel
clock freq was much too high. It was 193.16 and the HP documentation
for this monitor said it should be 162Mhz. I changed that and added
the modeline to my xorg.conf

Section "Monitor"
Identifier "External"
Option "RightOf" "Panel"
Modeline "1920x1200_60.00" 162 1920 2048 2256 2592 1200 1201
1204 1242 -HSync +Vsync
EndSection

Upon logging into my desktop I then ran:

$ xrandr --output DVI-D_1 --mode 1920x1200_60.00

Success!!


On Mon, Mar 17, 2008 at 11:47 AM, Leif Gruenwoldt <leifer@xxxxxxxxx> wrote:
I can't seem to get the native resolution to display properly on my
external display. The native is 1920x1200 @60 but using xrandr it
defaults to 1680x1050 @ 59 and manually setting it to native causes it
to go black.

$ xrandr
Screen 0: minimum 320 x 200, current 3360 x 1050, maximum 3600 x 1200
VGA_1 disconnected
PANEL connected 1680x1050+0+0 444mm x 277mm
1680x1050 59.9*+
DVI-D_1 connected 1680x1050+1680+0 519mm x 324mm
1920x1200 60.0 +
1600x1200 59.9
1680x1050 59.9*
1600x1000 59.9
1280x1024 84.9 75.0 59.9
1280x960 59.9
1152x864 75.0
1152x720 59.9
1024x768 75.1 60.0
832x624 74.6
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1

Manually setting it to the native causes the display to go black.

$ xrandr --output DVI-D_1 --mode 1920x1200



Some details about my hardware:
- Laptop (HP 8510p with ATI 2600HD)
- External 24" LCD (HP LP2465) connected on docking station DVI


The following info from my Xorg.0.log seems highly suspicious:

(II) RADEONHD(0): Not using mode "1920x1200" (mode clock too high)

and then later on down in the log

(II) RADEONHD(0): Not using default mode "1920x1200" (bad mode
clock/interlace/doublescan)

See attachments for Xorg.0.log and Xorg.conf.

Any help appreciated.

Leif.




--
Leif Gruenwoldt
Simulation Software Developer
DLCSPM 6-Sim (c)
Building A31
CFB Kingston
Tel: 613-541-5010 x3020
gruenwoldt@xxxxxxxxxxx
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