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Configure Xorg for AST2500 max resolution of 1920x1200 on Ubuntu Server 19.10

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jirka:

--- Quote from: MPC7500 on April 29, 2020, 07:17:58 pm ---What modelines gives you the cvt command?

--- End quote ---

# 1920x1200 59.88 Hz (CVT 2.30MA) hsync: 74.56 kHz; pclk: 193.25 MHz
Modeline "1920x1200_60.00"  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync

# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

# 1280x1024 59.89 Hz (CVT 1.31M4) hsync: 63.67 kHz; pclk: 109.00 MHz
Modeline "1280x1024_60.00"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync

MPC7500:
It should work, I guess. Maybe someone else have a clue.

FlyingBlackbird:
Is there possibly a risk of "overclocking"? Any documentation available that says wrong modelines do not destroy the AST2500?

jirka:

--- Quote from: FlyingBlackbird on May 05, 2020, 06:33:45 am ---Is there possibly a risk of "overclocking"? Any documentation available that says wrong modelines do not destroy the AST2500?

--- End quote ---

I don't thing so. I didn't find any such statement.

Moreover, it still works in 1920x1080 (after three months in 1920x1200).

jirka:
I just tried to boot to the "rescue mode" of my Fedora (it is labelled "F30") and ... the 1920x1200 works.

If I boot with the F32 or the F31 kernel (5.6.8 or 5.6.7) then it does not work (1920x1080 is the maximum).

So can it be a kernel issue?

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