Loongson Hardware Errata Summary

This page is unofficially maintained and continuously updated to collect known hardware flaws (errata) on Loongson platforms, complementing the relevant official materials.

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This is a living document, and its content will change as conditions evolve. Check back often!

Possible LS7A Bridge Hardware Flaw Causing AMDGPU Driver Crashes

If you see similar logs in the kernel messages or experience desktop freezes:

[ 9037.053812] radeon 0000:07:00.0: ring 0 stalled for more than 5657104msec
[ 9037.060557] radeon 0000:07:00.0: GPU lockup (current fence id 0x00000000000001b4 last fence id 0x00000000000001ca on ring 0)

Try adding amdgpu.dpm=0 to the kernel command line to disable AMDGPU dynamic frequency scaling as a workaround. This is confirmed to be caused by a hardware flaw in the LS7A bridge chip.

Affected platforms: 3A5000, 3A6000, 3C5000 (both 7A1000 and 7A2000 bridge-based boards).