Arch Linux

hellpe

Member

From: France

Registered: 2012-11-03

Posts: 20

Dual screen setup is faulty after BIOS and/or GNOME 3.26 update

Hello everyone,

I'm using a monitor (via DVI) and a TV (via HDMI) on my computer, and it used to work mostly fine, except for an annoying issue when my TV (even while shut down) was plugged into my PC: GNOME would boot without displaying anything on the monitor, forcing me to press Super+P three times at each login. After doing some research, I've discovered that this could be related to an old BIOS firmware, so I've updated it using a Windows utility provided by Asus (manufacturer of my P8P67 EVO mainboard).

Since it was very close to the day GNOME was updated to 3.26 in the Arch repositories, maybe my problems are not actually related to the BIOS update. Yet, here's the issues I've been running into since then:

- "Join displays" and "Mirror" do not work anymore. My TV displays an error message "Resolution not supported", even while the resolution is set up to 1920x1080 (which was perfectly functional before).
- "Single display" allows me to get a picture on my TV, but it looks horizontally stretched, even while my TV OSD tells that the resolution is 1920x1080 (again, I've never had such an issue before).
- The Super+P shortcut is partially broken: when selecting "Built-in only" or "External only", it always displays the picture on my monitor. I can't get Super+P to display anything on my TV.
- And finally, my previous issue (GNOME booting without displaying anything when the TV is plugged, requiring me to press Super+P three times at each login) has not been fixed by the BIOS upgrade

Some details that perhaps can be useful:
- My video card is an AMD Radeon R9 380, I'm using free software drivers only
- I'm using Wayland since GNOME 3.24 and I didn't tweak any configuration files by hand
- I also have Windows 10 in dualboot and I haven't see any issue with dual-screen in there

Can somebody help me fixing those issues?

Regards,

Last edited by hellpe (2017-10-23 21:38:43)