hrw
June 30, 2025, 5:10pm
1
I wonder did anyone spent some time on finding out where exactly problem is with pcie65 stuff.
GTK based apps have so many artifacts on text, that sometimes it is hard to read at all.
Qt/KDE ones display without any issues…
MPV (movie player) also shows text properly:
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hrw
June 30, 2025, 6:31pm
2
Also note that problem does not happen when llvmpipe is used instead of accelerated Mesa.
sevo
July 1, 2025, 12:59am
3
With llvmpipe, are you using the efi framebuffer or amdgpu drm kernel driver?
hrw
July 1, 2025, 6:59am
4
llvmpipe jumps in when system has both ASPEED and Radeon graphics cards.
Nevermind is ASPEED as astdrmfb or as simple-framebuffer.
Do you mean the PCIe-65 erratum for Altra family discussed in this github?
Per Altra family erratum, PCIE_65 may cause invalid addresses to be generated
on PCIe mmio writes, impacting certain device types, notably AMD GPUs, and thus
the Altra family is not generally compatible with those device types. We have
provided a proof-of-concept software patch under the GPL v2 that will allow
experimental and development work to proceed. PER THE TERMS OF THAT LICENSE
AND AS A REMINDER, NO WARRANTIES OR SUPPORT IS PROVIDED.
The patches for a particular kernel version are located in the directory with
that version's name.
hrw
July 17, 2025, 5:56am
6
Yes. That.
My machine has WX2100 and RX6700XT in slots. Booting without pcie-65 patches is waste of time as system misbehaves when sddm starts.
sevo
July 18, 2025, 12:10am
7
Well I suppose if the GPU drivers were rewritten to ensure aligned accesses and not assume X86 style write combining, the kernel patches wouldn’t be necessary. I assume the nvidia gpu drivers are written in such a way.
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