** Tags added: ubuntu-certified
** Tags added: cscc
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https://bugs.launchpad.net/bugs/1802834
Title:
Dim screen after first boot on Thinkpad A285
Status in linux package i
This possibly means brightness value is 0 when systemd-
backlight@amdgpu_bl0 saves the brightness, and it clamps its value to 5%
of max_brightness which is 12.
Needs to perform a kernel bisection to find the fix commit.
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Installed the 19.04 daily image, the kernel is 4.18.0-11-generic. It
works fine. And the brightness value is 255.
$ cat /sys/class/backlight/amdgpu_bl0/brightness
255
$ cat /sys/class/backlight/amdgpu_bl0/actual_brightness
255
$ cat /sys/class/backlight/amdgpu_bl0/max_brightness
255
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After you install the 18.04 image, it will show the dim screen.
After suspend, the backlight is normal.
$ cat /var/lib/systemd/backlight/*
12
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When this issue happens, what's the output of "grep .
/var/lib/systemd/backlight/*"?
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Title:
Dim screen after first boot on Thinkpad
After I resume from suspend, I found the backlight is normal, and here
is the log.
** Attachment added: "a285.journal.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1802834/+attachment/5221571/+files/a285.journal.log
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So it looks like the initial brightness is got from atombios of graphic
card, so it is atombios issue or the code can't correctly parse the
atombios.
it is highly possible that this is an atombios issue.
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backlight_level =
amdgpu_atombios_encoder_get_backlight_level_from_reg(adev);
dig = amdgpu_encoder->enc_priv;
dig->bl_dev = bd;
bd->props.brightness =
amdgpu_atombios_encoder_get_backlight_brightness(bd);
bd->props.power = FB_BLANK_UNBLANK;
backlight_updat
No, I didn't, let me try it.
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Title:
Dim screen after first boot on Thinkpad A285
Status in linux package in Ubuntu:
Confirmed
B
Do you also see the issue on 19.04 daily image?
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Title:
Dim screen after first boot on Thinkpad A285
Status in linux package in Ubu
Upgraded to 4.15.0-42 kernel from proposed. And this issue is still
exist. And the default value is 12, but the max is 255.
$ cat /sys/class/backlight/amdgpu_bl0/brightness
12
$ cat /sys/class/backlight/amdgpu_bl0/max_brightness
255
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Does this issue still happen after applying the latest updates?
Would it be possible for you to test the proposed kernel and post back if it
resolves this bug?
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.
Thank you in advance!
** Chang
apport information
** Tags added: apport-collected bionic
** Description changed:
- We installed the 18.04 daily image on ThinkPad A285, found the screen is
- dim at the first boot.
+ We installed the 18.04 daily image on ThinkPad A285, found the screen is dim
at the first boot.
+ ---
+ Proble
Here is the journalctl log.
** Attachment added: "journalctl.backlight.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1802834/+attachment/5211664/+files/journalctl.backlight.log
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