Arch Linux

anonwithaquestion

Member

Registered: 2018-09-30

Posts: 2

Lines are being output at the wrong width, unusable display mode.

Setup:

Hardware:
- A relic with an ATI RV530 GL in it

Software:
- I only know of xf86-video-ati.  If there's another compatible driver let me know.
- I've tried x + lxde + lxdm + i3 and wayland + gnome + gdm + sway, to similar results.

Complaint:
- When I got my display to start, the lines were being output a few pixels too wide, resulting in diagonal splotches for a display instead of a coherent image.  The mouse cursor was unaffected, only static objects were misrendered.

Attempted Diagnosis:
- I was able to confirm that a live CD of Linux Mint (Cinnamon Interface) was able to render proper imagery on my monitor.
- I checked the output of

xrandr

on Linux Mint, and compared it to the output of

DISPLAY=":0" xrandr

Working xrandr output (Linux Mint Cinnamon):

Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
DVI-0 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 434mm x 270mm
    1680x1050	59.9*+
    1280x1024	75.0	60.0
    1152x864	75.0
    1024x768	75.1	60.0
    800x600	75.0	60.3
    640x480	75.0	60.0
    720x400	70.1
DVI-1 disconnected (normal left inverted right x axis y axis)

Unusable xrandr output (Arch Linux x86_64):

Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
XWAYLAND0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 430mm x 270mm
    1680x1050	59.85*+

Possible Cause:
- The frequency output by Arch is slightly lower than the frequency output by Mint.
- I'm not sure how monitor signals work, but it's possible that the monitor is expecting an RGB to update 59.9 x NUM_PIXELS times per second, and that ARCH is updating it 59.85 x NUM_PIXELS times per second, resulting in duplicate pixels in each row, causing them to overflow to the next row.

Attempted Correction:
- I ran

DISPLAY=":0" xrandr -r 59.9.

Rate 59.90 Hz not available for this size

Do you think my diagnosis is correct?  Why or why not?

What information might I need to solve this problem?

What else can I do to try to set the refresh rate?

Your assistance is appreciated.

Last edited by anonwithaquestion (2018-09-30 20:12:44)

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,424

Website

Re: Lines are being output at the wrong width, unusable display mode.

Please use code tags when pasting to the boards: https://wiki.archlinux.org/index.php/Co … s_and_code

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Arch + dwm   •   Mercurial repos  •   Surfraw

Registered Linux User #482438

anonwithaquestion

Member

Registered: 2018-09-30

Posts: 2

Re: Lines are being output at the wrong width, unusable display mode.

Please use code tags when pasting to the boards: https://wiki.archlinux.org/index.php/Co … s_and_code

Apologies.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,728

Re: Lines are being output at the wrong width, unusable display mode.

If you want to compare behaviour on xorg then compare behaviour on xorg. Wayland is a whole other ballpark. Start a proper xorg session and check back.