BenQ monitor works sometimes... but rarely

English Hardware
1

Hello forums,

I have an openSUSE Tumbleweed installation but there is one problem preventing me from migrating completely from Windows as my main monitor isn’t working properly.

monitor-edid returns this:

Name: BenQ RL2455
EISA ID: BNQ7f1c
Screen size: 53.1 cm x 29.8 cm (23.97 inches, aspect ratio 16/9 = 1.78)
Gamma: 2.2
Digital signal
Max video bandwidth: 170 MHz

        HorizSync 30-83
        VertRefresh 50-76

        # Monitor preferred modeline (60.0 Hz vsync, 67.5 kHz hsync, ratio 16/9)
        ModeLine "1920x1080" 148.5 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync

It’s the BenQ RL2455HM monitor and Linux seems to not only not work with it as intended (I know I’ve probably got some Xorg.conf.d setup to do or something) but it seems to practically disable it entirely. By that I mean it prevents me from using any monitor menus and seems to lock the monitor up completely. I am also using another monitor (dual-monitor setup) over one of the DVI ports of the video card. Also to note, the monitor does sometimes jump into action after a long computer sleep or something, but most of the time and always after a reboot, it stays black and glitchy.

The video card in use is a Radeon R9 380 NITRO 4gb by SAPPHIRE and it is running under the amdgpu driver.

Any help would be great, thanks :wink:

(by the way, the DVI->VGA adapted monitor works as intended and also the BenQ monitor said something along the lines of Out of Range at some point but not any longer, now it consistently stays black and very rarely flashes with an empty monitor dialog box (monitor menu style)).

Thanks again.

2

BenQ monitors are notorious for their quirky behaviour with X-servers it seems. Check out the many results turned up with any google search.

What does ‘xrandr’ report? Assuming your DVI interface connecting to the monitor is ‘DVI-0’ (or edit it to suit) try the following perhaps

xrandr --newmode "1920x1080_60.00" 148.5 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
xrandr --addmode DVI-0 1920x1080_60.00
xrandr --output DVI-0 --mode 1920x1080_60.00

If you can get the monitor working via xrandr, it shouldn’t be hard to create a custom Xorg config file to deal with it.

Also to note, the monitor does sometimes jump into action after a long computer sleep or something, but most of the time and always after a reboot, it stays black and glitchy.

The monitor has a power saving mode perhaps?

The video card in use is a Radeon R9 380 NITRO 4gb by SAPPHIRE and it is running under the amdgpu driver.