New subject: X230 coreboot potential issues?

2 Nov 2017


      Hi,
On 27.10.2017 22:10, Hans Fritz wrote:
...
Hi, I installed coreboot on my X230, it works very well except for
these two things:
When the screen goes to sleep and I move the mouse to wake it up, it
wakes up at full brightness regardless of what the setting was before
it went to sleep. If I press the button to lower or increase
brightness, it switches back to what it was before sleeping. This
didn't happen with the same Linux install but on the stock BIOS.
this is a known issue. It actually was there all the time but only
got more visible with the introduction of ACPI/OpRegion for the inte-
grated GFX. Here is what I found out so far (on my ArchLinux):
w/o OpRegion:
   1. `acpi_video` driver gets loaded, systemd restores brightness from
      last shutdown.
   2. `i915` driver gets loaded, reads the current brightness.
   3. `i915` exposes backlight as `intel_backlight`, systemd restores
      brightness from last shutdown here as well.
Every time `i915` power cycles the backlight, it restores the value it
has seen when it was loaded.
w/ Opregion the order somehow changes to 2. 1. 3., now `i915` always
restores to 100% that it read before systemd restored the brightness.
A sane solution would be to extend XBCM in `src/drivers/intel/gma/acpi/
configure_brightness_levels.asl` to always notify `i915` when we change
the backlight through OpRegion mailbox 3.
...
The Fn key used to wake up the computer, but it doesn't anymore. Most
Fn key combinations still work, except for Fn+F3 (lock screen). This
was fine with the same Ubuntu install and the stock BIOS.
IIRC, this is configurable in the vendor BIOS and likely a option in the
EC that nobody missed enough to implement it in coreboot. Might be as
simple as h8_fn_ctrl_swap(). Fn+F3 might just need a little more ACPI
code.
...
Any thoughts? Are these issues with coreboot? Should I file an issue somewhere?
Yes please, https://ticket.coreboot.org/
Nico

Re: [coreboot] X230 coreboot potential issues?