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Tasklist

FS#80072 - [linux] 6.5.8 screen is glitchy

Attached to Project: Arch Linux
Opened by Tareque Md Hanif (tmdh) - Tuesday, 24 October 2023, 12:43 GMT
Last edited by Toolybird (Toolybird) - Thursday, 26 October 2023, 21:00 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To No-one
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
Linux 6.4.8 started to boot but the screen became glitchy. I could move the cursor, but the display was glitching.

In Linux 6.5.8, I figured out that the mainline kernel works just fine. But only when the patch for drivers/firmware/sysfb.c (which is in the PKGBUILD) is applied on top of mainline kernel, the problem happens.

Attached patch.patch is the problematic patch

Additional info:
* Linux 6.5.8
* AMD RADEON R7 M445
* Intel Core i7-7500u CPU
* Laptop

Attached problematic patch and lspci and lscpu

Thanks
   patch.patch (1.3 KiB)
   lspci.txt (1.8 KiB)
   lscpu.txt (2.9 KiB)
This task depends upon

Closed by  Toolybird (Toolybird)
Thursday, 26 October 2023, 21:00 GMT
Reason for closing:  Not a bug
Additional comments about closing:  Please move discussion to the support channels as per comments.
Comment by Jelle van der Waa (jelly) - Tuesday, 24 October 2023, 12:47 GMT
Where did you get this patch from? Do you have the original lkml submission link?
Comment by loqs (loqs) - Tuesday, 24 October 2023, 12:51 GMT
"drivers/firmware: skip simpledrm if nvidia-drm.modeset=1 is set" [1] is an Arch downstream patch for  FS#73720 .

[1] https://github.com/archlinux/linux/commit/5a5dea567a8c6a5e6319a114e4cb1f0d4bf83f5f
Comment by Jelle van der Waa (jelly) - Tuesday, 24 October 2023, 13:26 GMT
Ah, this faintly rings a bell. Afaik the new nvidia driver might resolve this hack (finally)?
Comment by Tareque Md Hanif (tmdh) - Tuesday, 24 October 2023, 13:29 GMT
This is my kernel command line arguments in GRUB:

GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet resume=UUID=96253e41-7432-4f8b-bb66-cb0e26ef0176 intel_iommu=on i915.enable_gvt=1"

There is no "nvidia-drm.modeset=1".
Comment by loqs (loqs) - Tuesday, 24 October 2023, 15:23 GMT
Without nvidia-drm.modeset=1 the patch does not do anything. Did you use Arch's kernel config to build your kernel?
Comment by Tareque Md Hanif (tmdh) - Tuesday, 24 October 2023, 16:17 GMT
Yes, I cloned the repo from https://gitlab.archlinux.org/archlinux/packaging/packages/linux, and then modified the patch to only include the sysfb.c patch.

Then ran makepkg -si.
Comment by loqs (loqs) - Tuesday, 24 October 2023, 17:22 GMT
Is there a difference in the number of entries in /dev/dri between the two kernels? Same for /sys/devices/platform/simple-framebuffer-*/
Please post the dmesg output for both kernels. How are you telling the two kernel packages apart?
Comment by Toolybird (Toolybird) - Tuesday, 24 October 2023, 20:12 GMT
There is no indication of an Arch packaging issue here (so far). Therefore this belongs in the more appropriate Arch support channels (Forum/IRC/Mailing Lists/Reddit/etc). Unless something of substance comes to light real soon now, this ticket will be closed and the discussion can be moved elsewhere.

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