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Configure Xorg for AST2500 max resolution of 1920x1200 on Ubuntu Server 19.10
FlyingBlackbird:
I have installed Ubuntu Server 19.10 with Gnome and lightdm and use the Xorg config from the wiki to enable full HD resolution (https://wiki.raptorcs.com/wiki/Troubleshooting/GPU#Display_stuck_at_default_low_resolution_with_AST_HDMI_GPU).
According to the brief spec (https://www.aspeedtech.com/products.php?fPath=20&rId=440) the AST2500 also supports 1920x1200@60 Hz but I could not successfully enable this resolution.
How do I have to configure Xorg (or is it an error in the spec?)?
My steps tried so far (using the cvt tool to create a modeline for the Xorg.conf and adding this to the Xorg conf file as described in the above link):
--- Code: ---# usage: cvt [-v|--verbose] [-r|--reduced] X Y [refresh]
cvt 1920 1200 60
cvt -r 1920 1200 60
cvt 1920 1200 30
--- End code ---
I have also added the modeline name to the "modes" line of the display (without success):
Ubuntu is never using this resolution and does also not offer it in the display resolution settings dialog of Gnome.
FlyingBlackbird:
I have found the correct settings now by modiying the xorg.conf from the Raptor wiki just a little bit.
The reason why it didn't work were the conservative HorizSync and VertRefresh settings. After commenting them it did work (at least in Fedora 31)
--- Code: ---# AST2500
Section "Device"
Identifier "GPU0"
Driver "modesetting"
BusID "PCI:2@5:0:0"
VendorName "ASpeed Corporation"
EndSection
# configure as appropriate for your monitor -- a standard 1080p screen is assumed below
Section "Monitor"
Identifier "Monitor0"
# HorizSync 30.0-70.0
# VertRefresh 50.0-70.0
Modeline "1920x1080" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync
# 1920x1200 59.88 Hz (CVT 2.30MA) hsync: 74.56 kHz; pclk: 193.25 MHz
Modeline "1920x1200" 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync
EndSection
# this is absolutely necessary, it tells xorg which GPU to use for the screen
Section "Screen"
Identifier "Screen0"
Monitor "Monitor0"
Device "GPU0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1920x1080" "1920x1200"
EndSubSection
EndSection
--- End code ---
I would be happy if somebody could confirm that these settings are working - I will add them then to the according Raptor wiki page.
MPC7500:
Sadly, I can't test myself. But on the RCSwiki you could describe how to get the needed modeline using cvt command, modeline calculator or looking into Xorg.0.log for supported resolutions etc..
jirka:
--- Quote from: FlyingBlackbird on February 01, 2020, 04:26:39 pm ---
# 1920x1200 59.88 Hz (CVT 2.30MA) hsync: 74.56 kHz; pclk: 193.25 MHz
Modeline "1920x1200" 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync
I would be happy if somebody could confirm that these settings are working - I will add them then to the according Raptor wiki page.
--- End quote ---
It worked until yesterday update (but I think that the Fedora 31 updated just the kernel, not the Xorg?!).
Do you have similar experience?
FlyingBlackbird:
--- Quote from: jirka on April 26, 2020, 06:10:55 am ---
--- Quote from: FlyingBlackbird on February 01, 2020, 04:26:39 pm ---
# 1920x1200 59.88 Hz (CVT 2.30MA) hsync: 74.56 kHz; pclk: 193.25 MHz
Modeline "1920x1200" 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync
I would be happy if somebody could confirm that these settings are working - I will add them then to the according Raptor wiki page.
--- End quote ---
It worked until yesterday update (but I think that the Fedora 31 updated just the kernel, not the Xorg?!).
Do you have similar experience?
--- End quote ---
My Blackbird planar is dead since February (RMA is done but the new planar is still at USPS in the USA due to Corona transportation bottlenecks so I cannot say anything.
I hope your planar is not dead too ;-)
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