On 7/18/2025 9:36 AM, Lauri Tirkkonen wrote:
On Fri, Jul 18 2025 08:10:06 -0500, Mario Limonciello wrote:
Do you by chance have an OLED panel? I believe what's going on is that userspace is writing zero or near zero and on OLED panels with older kernels this means non-visible.
Yes, this is an OLED panel. But I don't believe it's userspace writing anything at this point in the boot; before the bisected commit, brightness was set to 32 (out of max 255) on this hardware when I checked from the initramfs rescue shell. At the bisected commit, it's 0 (out of max 255).
There is another commit that fixes the behavior that is probably missing.
Which commit is that? It's not in 6.15.7?
https://github.com/torvalds/linux/commit/39d81457ad3417a98ac826161f9ca0e6426...
No; it's not currently backported. Assuming it helps your issue I think it's a good argument to backport.