Trouble with AMD RX480 : how to increase max resolution ?

Hi,

As a french newsbie, I'm jumping into Linux world with Zorin OS.
Install is ok, all run like a charms except my video card.

RX 480 on display port plugged on a 4k monitor. I can't go higher than 1280x800.

Here is some info

lspci -nnk | grep -i -EA3 "3d|display|vga"

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X] [1002:67df] (rev c7)
Subsystem: ASUSTeK Computer Inc. Ellesmere [Radeon RX 470/480/570/580] [1043:0501]
Kernel driver in use: amdgpu
Kernel modules: amdgpu


xrandr
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 16384 x 16384
DisplayPort-0 connected primary 1280x800+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
1280x800 59.81*
1152x864 59.97
1280x720 60.00 59.94
1024x768 60.00
800x600 60.32
720x480 60.00 59.94
640x480 60.00 59.94
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)


Can someone help me ?

Can you try the instructions outlined in this:
https://askubuntu.com/questions/1075157 ... ion-higher
Please let us know if it works out.

Thanks Aravisian for your help.

I start a post with this same question 10 day ago. after posting, I restart my computer and I had suddently my Zorin with 4k (so I have deleted my post).

But on next restart of my computer, trouble come back so I write this actual post !

In fact I dont understand that happen with my video card cause after restart my computer and without any update : trouble solved by itselft one's again.

For now, I've got 4k with my video card. Hope its holds

Greg-seo wrote:Thanks Aravisian for your help.

I start a post with this same question 10 day ago. after posting, I restart my computer and I had suddently my Zorin with 4k (so I have deleted my post).

But on next restart of my computer, trouble come back so I write this actual post !

In fact I dont understand that happen with my video card cause after restart my computer and without any update : trouble solved by itselft one's again.

For now, I've got 4k with my video card. Hope its holds

I hope so, too. Maybe there was an update that went through? I have gotten many updates in the last few weeks, mostly containing a successive climbing of the Kernel as the Zorin Team continues testing each Kernel iteration before release.

hi come back to 1280x800 on my 4k monitor after updating Zorin. This thread helped me : https://askubuntu.com/questions/1075157 ... ion-higher

Greg-seo wrote:hi come back to 1280x800 on my 4k monitor after updating Zorin. This thread helped me : https://askubuntu.com/questions/1075157 ... ion-higher

Greg-seo, glad you got it fixed. Thanks for sharing your solution.
Please remember, the forum has moved to https://forum.zorin.com so please join up over there for continued support.