Please boot with kernel parameter "drm.debug=0xe log_buf_len=16M" and
attach dmesg here.
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https://bugs.launchpad.net/bugs/1865346
Title:
Changing backlight no longer works
** Package changed: linux-5.4 (Ubuntu) => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1865346
Title:
Changing backlight no longer works with Linux 5.4
Status in linux
I have a Dell XPS 15 9570 with the same issue. This includes the slider
in the top panel menu, in system settings and when using the keyboard
shortcuts. When using the keyboard shortcuts, the OSD shows and the bar
moves but the screen brightness is not changed.
System:Host: rex Kernel:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-5.4 (Ubuntu)
Status: New => Confirmed
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