Maximum resolution not being detected (Linux driver i915 and Intel Iris Plus Graphics G1)

[mbn12]

Hi all,

My Lenovo S145 with a Intel Iris Plus Graphics G1 GPU is not detecting the maximum resolution (2560x1080) of an LG Ultrawide monitor 29WK500/50S in a Gnome/Wayland session, but works in a X11 (I can manually add and set with xrandr).

Strangely, the same SO/Gnome/Wayland/Kernel Driver and Monitor fully works even in Gnome/Wayland, when only the GPU is changed (even same driver). Maybe a driver issue with a particular hardware?

- **I'd like to ask for help to correctly fix the resolution in a wayland session (only in X11 with xrandr)**
- **and to track down the issue (for learning purposes).**

I am posting here because the exact same software stack (SO/Gnome/Wayland/driver) and monitor works fine when the GPU is a Intel HD Graphics 520] [8086:1916]. It seems a particularity of this GPU hw.

How reproducible:
May be specific to my hardware (Lenovo Ideapad S145 / Intel Iris Plus Graphics G1).
Not related to monitor or HDMI cable (works fine in a gnome X11 session)

Steps to Reproduce:
1. Start gnome wayland session
2. Start control-center, display settings
3. Only presented resolution choice is maximum resolution of 1920x1080

Expected results:
Existing entry of 2560x1080@60 resolution and possibility to change.

Graphics adapter:
Intel Corporation Iris Plus Graphics G1 (Ice Lake) [8086:8a56] (rev 07)
Intel Core i5-1035G1
(desired resolution is supported by GPU / HDMI output - https://ark.intel.com/content/www/us/en/ark/products/196603/intel-core-i5-1035g1-processor-6m-cache-up-to-3-60-ghz.html)
```
00:02.0 VGA compatible controller [0300]: Intel Corporation Iris Plus Graphics G1 (Ice Lake) [8086:8a56] (rev 07)
Subsystem: Lenovo Device [17aa:3fdc]
Kernel driver in use: i915
Kernel modules: i915
```

OS:
Fedora 32 - 5.8.10-200.fc32.x86_64, up to date

Notebook:
Lenovo Ideapad S145

Monitor: LG Ultrawide 29WK500/50S (max res: 2560x1080)
Decoded edid reports the desired resolution:
```
DTD 4: 2560x1080 74.991 Hz 64:27 83.915 kHz 228.250 MHz (798 mm x 334 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 10 Vback 26 Vpol N
```

Full logs:
https://drive.google.com/drive/folders/1bGTums4cASLzIQNgc6xB9bLyi6hKksli?usp=sharing

Strangely, the same OS, monitor, cable, gnome/wayland and even kernel driver works fine. When connected to another noteboot the 2560x1080 resolution is detected just fine by gnome/wayland.
```
00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07)
Subsystem: Acer Incorporated [ALI] Device [1025:100c]
Kernel driver in use: i915
Kernel modules: i915
```

- EDID reading was exact the same in both notebooks (one works just fine).

Solutions already tried:
Boot parameters in grub (individually):
```
video=XWAYLAND1:2560x1080@60
video=HDMI-1:2560x1080@60
i915.enable_guc=-1
nomodeset i915.modeset=0
```

Multiple xrandr solutions, adding modes, etc -- which are supposedly no to work anyway, since xrandr can't control wayland (?).
When logging in gnome using a X11 session I can manually add the mode and set it using xrandr (but the goal is to fix the wayland session).

- Issue also exist in newer Fedora 33 with gnome 3.38.

Possibly related issues:
https://ask.fedoraproject.org/t/fedora-31-workstation-gnome-wayland-low-display-resolution/5342
https://ask.fedoraproject.org/t/why-fedora-31-doesnt-support-higher-than-1024-768-resolution/4110
https://ask.fedoraproject.org/t/why-fedora-31-doesnt-support-higher-than-1024-768-resolution/4110/2
https://ask.fedoraproject.org/t/intel-advisory-drivers-above-version-5-0-should-be-installed/1378
https://ask.fedoraproject.org/t/custom-screen-resolution-problem/5113/2
https://ask.fedoraproject.org/t/wrong-monitor-resolution-detected/7656
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1826316
https://gitlab.gnome.org/GNOME/mutter/-/issues/574
https://superuser.com/questions/1137574/manually-add-a-resolution-to-gnome-with-wayland
https://bugzilla.redhat.com/show_bug.cgi?id=1134885#c11
https://devopsx.com/change-resolution-from-command-line-in-ubuntu-18-04s-wayland/
https://unix.stackexchange.com/questions/275327/configure-gnome-wayland-display-configuration-from-command-line

- Any other hardware than the GPU, HDMI cable or monitor could have any influence?
ie. some motherboard controller, BIOS/UEFI, etc... that could impact the correct detection?

Thank you in advance for any help,

Mario

[Sebastian_M_Intel]

Hello mbn12, 

Thank you for posting on the Intel® communities.   

I would like to let you know that Intel® does not provide direct downloads and technical support for Linux drivers. The Intel Graphics Linux driver is primarily supported through the original equipment manufacturer (OEM), or the Linux* distribution vendor.  You might also want to visit the Intel Open Source Technology Center at https://01.org/linuxgraphics. Have you tried checking this website?  

You might also want to check with Lenovo* to see whether they have any information regarding Linux compatibility with this specific information.  

For more information, see the Drivers for Linux document for more details. 

Regards, 

Sebastian M  

Intel Customer Support Technician  

[Sebastian_M_Intel]

Hello mbn12, 

Were you able to check the previous post and follow our recommendations? Please let me know if you need more assistance.   

Additionally, I will highly recommend you to contact your OS Vendor for peer assistance on this: https://www.intel.com/content/www/us/en/support/topics/linux-osv.html

Regards, 

Sebastian M 

Intel Customer Support Technician  

[Sebastian_M_Intel]

Hello mbn12,  

We have not heard back from you, so we will close this inquiry. Please remember to check with your OEM, the Linux* distribution vendor, or visit the Intel Open Source Technology Center for further assistance. 

If you have additional questions, please create a new thread and we will gladly assist you.  

Regards,  

Sebastian M  

Intel Customer Support Technician