https://bugzilla.kernel.org/show_bug.cgi?id=204251
Artur (swat.ar...@gmail.com) changed:
What |Removed |Added
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CC| |swat.ar...@gmail.com
--- Comment #32 from Artur (swat.ar...@gmail.com) ---
Same problem on Dell Precision 7730 (UHD screen, integrated GPU). Brightness
does not change pressing below keys, there are similar errors instead.
Fn+Up
Jan 26 08:52:38 P7730 kernel: [ 2740.582555] ACPI BIOS Error (bug): Could not
resolve symbol [\_SB.PCI0.PEG0.NHDA], AE_NOT_FOUND (20190816/psargs-330)
Jan 26 08:52:38 P7730 kernel: [ 2740.582575] ACPI Error: Aborting method \NEVT
due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
Jan 26 08:52:38 P7730 kernel: [ 2740.582588] ACPI Error: Aborting method
\_SB.PCI0.LPCB.ECDV._Q66 due to previous error (AE_NOT_FOUND)
(20190816/psparse-529)
Fn+Down
Jan 26 08:52:46 P7730 kernel: [ 2748.592444] ACPI BIOS Error (bug): Could not
resolve symbol [\_SB.PCI0.PEG0.NHDA], AE_NOT_FOUND (20190816/psargs-330)
Jan 26 08:52:46 P7730 kernel: [ 2748.592461] ACPI Error: Aborting method \NEVT
due to previous error (AE_NOT_FOUND) (20190816/psparse-529)
Jan 26 08:52:46 P7730 kernel: [ 2748.592474] ACPI Error: Aborting method
\_SB.PCI0.LPCB.ECDV._Q66 due to previous error (AE_NOT_FOUND)
(20190816/psparse-529)
Dell firmware is newest:
root@P7730:~# fwupdmgr get-updates
No upgrades for Thunderbolt Controller: current version is 41.00: 41.00=same,
36.00=older
No upgrades for System Firmware: current version is 1.12.1: 1.12.1=same,
1.11.0=older, 1.10.1=older, 1.9.0=older, 1.8.2=older
I tried downgrade BIOS to 1.10.1 a few weeks ago, it restored brightness
control, AFAIR there were no errors in syslog.
On the other hand I restored Ubuntu 16.04 image (shipped with this machine) -
brightness control worked here, whichever BIOS version was: 10,11,12. After
dist-upgrade to 18.04 then 19.10 brightness control was lost again, same
errors.
Current kernel in Debian testing:
$ uname -a
Linux P7730 5.4.0-3-amd64 #1 SMP Debian 5.4.13-1 (2020-01-19) x86_64 GNU/Linux
Tried also this option:
# systool -vm i915 | grep dpcd
enable_dpcd_backlight= "1"
But it didn't help.
And grub parameters "acpi_osi=Linux acpi_backlight=vendor", all to no avail.
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