* Regression in backlight control after 20f5481aaf17 ("drm/amd/display: Add power module on Linux")
@ 2026-05-09 0:36 Matthew Schwartz
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From: Matthew Schwartz @ 2026-05-09 0:36 UTC (permalink / raw)
To: Ray Wu, Chenyu Chen, Leo Li; +Cc: amd-gfx@lists.freedesktop.org
Hello,
On my Legion Go S, which has an IPS LCD screen, the brightness slider in Steam becomes very unbalanced on amd-staging-drm-next, with the bottom 45% of the slider no longer appearing to be any different than the minimum value. After bisecting, I landed on 20f5481aaf17 ("drm/amd/display: Add power module on Linux") as the first bad commit.
I uploaded a dmesg from a good kernel vs a bad kernel below.
Last good kernel: https://gist.github.com/matte-schwartz/e98e4d3e1d8d3c4c042e2a76450b48b1
First bad kernel: https://gist.github.com/matte-schwartz/5ef4f6967a17bc534e81f79e5cf71e02
Let me know if there are any additional details I can provide to help with debugging this further.
Thanks,
Matt
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2026-05-09 0:36 Regression in backlight control after 20f5481aaf17 ("drm/amd/display: Add power module on Linux") Matthew Schwartz
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