intel_backlight not working on -current

it happened after the last batch of update (glibc, kernel 5.10.9)

running intel_backlight gives me this error:
Code:(intel_backlight:30159) intel-mmio-CRITICAL: Test assertion failure function intel_mmio_use_pci_bar, file intel_mmio.c:146:
(intel_backlight:30159) intel-mmio-CRITICAL: Failed assertion: !(error != 0)
(intel_backlight:30159) intel-mmio-CRITICAL: Last errno: 13, Permission denied
(intel_backlight:30159) intel-mmio-CRITICAL: Couldn't map MMIO region
Stack trace:
#0 [<unknown>+0x40a630]
#1 [<unknown>+0x407684]
#2 [<unknown>+0x40708f]
#3 [__libc_start_main+0xea]
#4 [<unknown>+0x40715a]
Test (null) failed.
**** DEBUG ****
(intel_backlight:30159) intel-chipset-DEBUG: Test requirement passed: pci_dev
(intel_backlight:30159) intel-mmio-CRITICAL: Test assertion failure function intel_mmio_use_pci_bar, file intel_mmio.c:146:
(intel_backlight:30159) intel-mmio-CRITICAL: Failed assertion: !(error != 0)
(intel_backlight:30159) intel-mmio-CRITICAL: Last errno: 13, Permission denied
(intel_backlight:30159) intel-mmio-CRITICAL: Couldn't map MMIO region
(intel_backlight:30159) igt-core-INFO: Stack trace:
(intel_backlight:30159) igt-core-INFO: #0 [<unknown>+0x40a630]
(intel_backlight:30159) igt-core-INFO: #1 [<unknown>+0x407684]
(intel_backlight:30159) igt-core-INFO: #2 [<unknown>+0x40708f]
(intel_backlight:30159) igt-core-INFO: #3 [__libc_start_main+0xea]
(intel_backlight:30159) igt-core-INFO: #4 [<unknown>+0x40715a]
**** END ****
FAIL (-1.000s)no additional information on dmesg or syslog