On Mon, Nov 03, 2025 at 03:55:53PM -0800, Christopher Snowhill wrote:
https://lore.kernel.org/lkml/9a27f2e6-4f62-45a6-a527-c09983b8dce4@cachyos.or...
tglx already summed up what the options are:
https://lore.kernel.org/all/878qgnw0vt.ffs@tglx
Qt is built with -march=znver4, which automatically enables -mrdseed. This is building rdseed 64 bit, but then the software is also performing kernel feature checks on startup. There is no separate feature flag for 16/32/64 variants.
No, there aren't.
And the problem here is that, AFAICT, Qt is not providing a proper fallback for !RDSEED. Dunno, maybe getrandom(2) or so. It is only a syscall which has been there since forever. Rather, it would simply throw hands in the air.
Soon there will be client microcode fixes too so all should be well.