Acer Aspire A315 IOAPIC failure on Ubuntu 18.04, kernel hangs, can't load, kernel freeze (AMD Ryzen 5/Radeon/Raven) / AMDGPU Hybrid crash

[Richard Baka]

CPU: Ryzen 5 2500U
VGA: Radeon 535
Notebook: Acer Aspire A315

This is a brand new notebook on the market with Ryzen 5/Radeon.
The default kernel of Ubuntu(18.04) hangs at loading with message:

tsc: Refined TSC clocksource calibration: 1996.250 MHz
clocksource: tsc: mask: 0xffffffffffffffff max_cycles: (...), max_idle_ns: (...)
Soft lockup

Using pci=noacpi kernel parameter kernel loads without any problem but my notebook produces more heat than on Win10. If I know right Acer notebooks need ACPI to the correct power management.

The same thing happens on mainline 4.17,4.18rc1-2.
BIOS upgrade to the latest version: 1.08 hasn't helped

This problem has been reported upstream:
https://bugzilla.kernel.org/show_bug.cgi?id=200087

The latest correctly working kernel was 4.13.* but the heat problem was present with this too.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1776563

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Richard Baka (bakarichard91)]

apport-collect 1776563 can't be entered because the kernel can not load.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Freihut (freihut)]

Had this on my A315 too, but I returned it to the vendor. Seems to be an UEFI-Bug, because it doesn't happened with my Ryzen 2500U from HP. Could also be related to that Ryzen/Radeon 535 combination (Vega/CGN 3).

On Grub-Menu press E and add "pci=noacpi" as kernel-parameter (where normally "quite splash" is). Then go on booting by pressing F10.
Sometimes (XFCE) it was also necessary to add "nomodeset" to boot, Gnome for example didn't need it (AFAIK).

I remember, I also needed to install amd's pro driver (for 18.04) via amdgpu-pro-install to get rid of the "nomodeset". I was able to run amdgpu-pro-uninstall later and still not needed the "nomodeset". Could be related to my system, but you may give it a try.
I was also using Kernel 4.17 (Mainline), which is available on http://kernel.ubuntu.com/~kernel-ppa/mainline/ or with UKUU https://www.omgubuntu.co.uk/2017/02/ukuu-easy-way-to-install-mainline-kernel-ubuntu

[Richard Baka (bakarichard91)]

Thanks Freihut, I will try this.

[Richard Baka (bakarichard91)]

It works but very slow. This could be an ACPI problem.

[Richard Baka (bakarichard91)]

I installed the new amdgpu pro driver and everything is very fast now. This bug should be reported to freedesktop, would you like somebody to do it? :D

[Richard Baka (bakarichard91)]

*Sorry correction: Who would like to do it? :D

[Richard Baka (bakarichard91)]

"The fact that ACPI was designed by a group of monkeys high on LSD, and is some of the worst designs in the industry obviously makes running it at any point pretty damn ugly."
Torvalds, Linus (2005-07-31). Message. linux-kernel mailing list. IU. Retrieved on 2006-08-28.

[Richard Baka (bakarichard91)]

Power management doesn't work well this way. It was hot a little. I've changed back to win10. This should be fixed by kernel developers or with a downstream patch.

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Created attachment 276583
dmesg after starting kernel with pci=noacpi

This is a brand new notebook on the market with Ryzen 5/Radeon. With disabled ACPI kernel boots without any problem but my notebook produces more heat than on Win10. Otherwise this happens when it is stayed on the bios screen in a while.

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

CPU: AMD Ryzen 5 2500U
GPU1: AMD Radeon Vega 8
GPU2: AMD Radeon 535

(I wrote to Acer to fix their bios problems but they said Linux is not supported. I don't think they are right but what can I do?)

[erik.schmauss (erik.schmauss-linux-kernel-bugs)]

Created attachment 276585
attachment-31427-0.html

Out of office 6/18-6/27

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Created attachment 276587
Soft lockup failure without noacpi

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Nothing changes with disabled iommu.

[Richard Baka (bakarichard91)]

Reported upstream:
https://bugzilla.kernel.org/show_bug.cgi?id=200087

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Created attachment 276589
dmesg after amd_iommu_dump=1

[ 0.000000] AMD-Vi: Using IVHD type 0x11
[ 0.000000] AMD-Vi: device: 00:00.2 cap: 0040 seg: 0 flags: b0 info 0000
[ 0.000000] AMD-Vi: mmio-addr: 00000000fd900000
[ 0.000000] AMD-Vi: DEV_SELECT_RANGE_START devid: 00:01.0 flags: 00
[ 0.000000] AMD-Vi: DEV_RANGE_END devid: ff:1f.6
[ 0.000000] AMD-Vi: DEV_ALIAS_RANGE devid: ff:00.0 flags: 00 devid_to: 00:14.4
[ 0.000000] AMD-Vi: DEV_RANGE_END devid: ff:1f.7
[ 0.000000] AMD-Vi: DEV_SPECIAL(HPET[0]) devid: 00:14.0
[ 0.000000] AMD-Vi: DEV_SPECIAL(IOAPIC[33]) devid: 00:14.0
[ 0.000000] AMD-Vi: DEV_SPECIAL(IOAPIC[34]) devid: 00:00.1
[ 0.000000] [Firmware Bug]: AMD-Vi: No southbridge IOAPIC found

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Created attachment 276591
Error message before freezing (without quite splash)

[erik.schmauss (erik.schmauss-linux-kernel-bugs)]

Please try booting with linux 4.18-rc1 or later. Also, please try 4.18-rc1+ with/without ACPI

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Hi Erik,

Absolutely the same thing on 4.18rc1 and on rc2 too.

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Fedora loads without any additional parameters(mysterious).

[ 0.000000] Switched APIC routing to physical flat.
[ 0.002000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[ 0.007000] tsc: Fast TSC calibration using PIT
[ 0.008000] tsc: Detected 1996.299 MHz processor
[ 0.008000] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x398d0c7513b, max_idle_ns: 881590744042 ns
[ 0.008000] Calibrating delay loop (skipped), value calculated using timer frequency.. 3992.59 BogoMIPS (lpj=1996299)

Heat production may be still present but I can't measure it because there is no temperature values in "sensors" (there is 5 values in Win10).

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Created attachment 277069
Fedora loads without noacpi

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

*there are no values

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Erik, I think this is in connection with clocksource calibration but I'm not an expert.

This works:
[ 0.007000] tsc: Fast TSC calibration using PIT
[ 0.008000] tsc: Detected 1996.299 MHz processor
[ 0.008000] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x398d0c7513b, max_idle_ns: 881590744042 ns

This doesn't:
[...] tsc: Refined tsc clocksource calibration: ...
[...] clocksource: tsc: mask: 0xfff...f (...)

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

Hi, I was trying another kernel parameters and noapic seems to work. It is not needed to disable the whole ACPI "service", however I don't know how important apic is. On kernel 4.18 even temperature sensors appear.
Power management is almost perfect if cpu governor is set to powersave.

At least amdgpu crashes now so kernel doesn't start without nomodeset. Could this be an acpi problem or I should ask kernel firmware developers?

[ggollner (ggollner-linux-kernel-bugs)]

Hi,
amdgpu doesn't crash on my a315-41g-r40x (BIOS V1.08) with
  linux-next-next-20180713 compiled with VGA_SWITCHEROO=N
and with
  kernel parameters: ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

gg71, where have you been till now? :D
Thanks, I will try it.

[bakarichard91 (bakarichard91-linux-kernel-bugs)]

gg71, it works almost perfectly, thanks again. I have been working on this for ca one month. Please write a mail to me if you have any new info.

[Richard Baka (bakarichard91)]

The solution for Acer A315-41G-* notebooks: (USE AT YOUR OWN RISK - PLS be very careful)

1. Load kernel with these parameters: ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2 nomodeset
This is how it can be done (1. answer/first half 1-4): https://askubuntu.com/questions/19486/how-do-i-add-a-kernel-boot-parameter

1/b.(if it is not installed) Install ubuntu and load installed kernel again using the parameters (see 1.)

2. Start a terminal and do these steps:
> cd ~
> mkdir kernelbuild
> cd kernelbuild
> wget -c https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.17.6.tar.xz
> tar -xvf linux-4.17.6.tar.xz
> cd linux-4.17.6
> sudo apt install git build-essential kernel-package fakeroot libncurses5-dev libssl-dev ccache bison flex
> make menuconfig
+> Save,OK,EXIT
> nano .config
+> ctrl+w and search for CONFIG_VGA_SWITCHEROO=y
+> replace y with n (this is not ideal and should be fixed later)
+> ctrl+o, enter
> make -j4 (this will take a while, be patient)
> make modules_install
> sudo make install
> sudo nano /etc/default/grub
+> Edit the correct line and add the parameters: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2"
+>CTRL+O, enter
>sudo update-grub
+> reboot and start the correct kernel

If you install xsensors (sudo apt install xsensors) and start it (xsensors) you can monitor the temperature values of your notebook. (Recommended)

[Richard Baka (bakarichard91)]

Dear Ubuntu maintainers,

couldn't this be fixed by an ubuntu kernel patch? The hardest part is to disable gpu switching at kernel load time. APIC fixing parameters can be hardcoded for these models I think or search for the correct pci controller using a smart script.

This was a hell of an investigation, never again. Thanks for gg71, he/she is a lifesaver.

[AaronMa (mapengyu)]

Hi Richard:

This issue should be related to the buggy BIOS ivrs table.
Kernel panic when found no southbridge device ID.

Could you try boot kernel with "amd_iommu_dump=1 amd_iommu=off" (remove other kernel parameters you tried to solve this issue).

If it works, please attach the dmesg here.
I will try to make a kernel patch to make kernel boot with irq map disabled instead of panic.

[Richard Baka (bakarichard91)]

Hi AaronMa,

thanks for the response. I tried it but it didn't work. I think iommu problem is not the main reason of the kernel hang. Otherwise it can be disabled in BIOS and there is no change.

The main reason is: https://bugzilla.kernel.org/attachment.cgi?id=276587 like you can se on this picture is that IOAPIC[4] and IOAPIC[5] are not in the invrs table so we should search the correct pci controllers using lspci and give them to the kernel.

In this way:
LINUX_DEFAULT="quiet splash ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2"

Kernel can be started even with noapic but two sensors will be missing and the advanced touchpad functions will not work. This is the reason of CONFIG_VGA_SWITCHEROO=n compile time kernel parameter.

There is an another problem: this notebook has two GPUs and amdgpu (or the kernel, I don't know) can not handle this correctly so gpu switching has to be disabled

[Richard Baka (bakarichard91)]

Kernel can be started even with noapic but two sensors will be missing and the advanced touchpad functions will not work.

!!!This line is not here: This is the reason of CONFIG_VGA_SWITCHEROO=n compile time kernel parameter.

There is an another problem: this notebook has two GPUs and amdgpu (or the kernel, I don't know) can not handle this correctly so gpu switching has to be disabled
!!!But here: This is the reason of CONFIG_VGA_SWITCHEROO=n compile time kernel parameter.

[Richard Baka (bakarichard91)]

AaronMa,

This is the iommu debug:

[ 0.000000] AMD-Vi: Using IVHD type 0x11
[ 0.000000] AMD-Vi: device: 00:00.2 cap: 0040 seg: 0 flags: b0 info 0000
[ 0.000000] AMD-Vi: mmio-addr: 00000000fd900000
[ 0.000000] AMD-Vi: DEV_SELECT_RANGE_START devid: 00:01.0 flags: 00
[ 0.000000] AMD-Vi: DEV_RANGE_END devid: ff:1f.6
[ 0.000000] AMD-Vi: DEV_ALIAS_RANGE devid: ff:00.0 flags: 00 devid_to: 00:14.4
[ 0.000000] AMD-Vi: DEV_RANGE_END devid: ff:1f.7
[ 0.000000] AMD-Vi: DEV_SPECIAL(HPET[0]) devid: 00:14.0
[ 0.000000] AMD-Vi: DEV_SPECIAL(IOAPIC[33]) devid: 00:14.0
[ 0.000000] AMD-Vi: DEV_SPECIAL(IOAPIC[34]) devid: 00:00.1
[ 0.000000] [Firmware Bug]: AMD-Vi: No southbridge IOAPIC found

I will give you the correct iommu "addresses" after dinner :).

[Richard Baka (bakarichard91)]

HOT NEWS!!

CONFIG_VGA_SWITCHEROO=n can be avoided using these kernel parameters amdgpu.runpm=0 radeon.modeset=0.
Further investigation is in progress...

[Richard Baka (bakarichard91)]

This could be the better solution because of the notebook's lowest heating but I'm not sure.

[Richard Baka (bakarichard91)]

Hi all,

After a bit of testing the power management seems to be better but it is far away from perfect. I don't see any anomaly watching temperature sensors (instead of ath10k_hwmon-pci(?!??)) but my notebook is definitely warm if I hold it on my lap.
This is more better on win10, I don't know why.

mosomaci@pc:~$ sensors
k10temp-pci-00c3
Adapter: PCI adapter
Tdie: +55.0°C (high = +70.0°C)
Tctl: +55.0°C

amdgpu-pci-0100
Adapter: PCI adapter
vddgfx: +0.81 V
fan1: N/A
temp1: +50.0°C (crit = +104000.0°C, hyst = -273.1°C)
power1: 1.13 kW (cap = 28.00 W)

ath10k_hwmon-pci-0300
Adapter: PCI adapter
temp1: +91.0°C

amdgpu-pci-0400
Adapter: PCI adapter
vddgfx: N/A
vddnb: N/A
fan1: N/A
temp1: +55.0°C (crit = +80.0°C, hyst = +0.0°C)
power1: N/A

Could our APIC fix not a perfect solution for this problem? I know that the DSDT is totally broken:

[ 0.088280] ACPI: Added _OSI(Module Device)
[ 0.088280] ACPI: Added _OSI(Processor Device)
[ 0.088280] ACPI: Added _OSI(3.0 _SCP Extensions)
[ 0.088280] ACPI: Added _OSI(Processor Aggregator Device)
[ 0.088280] ACPI: Added _OSI(Linux-Dell-Video)
[ 0.092591] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 0.100296] ACPI BIOS Error (bug): Failure creating [\_SB.PCI0.LPC0.EC0._Q46], AE_ALREADY_EXISTS (20180531/dswload2-316)
[ 0.100309] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20180531/psobject-221)
[ 0.100313] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100321] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.LPC0.EC0.UX**], AE_NOT_FOUND (20180531/psargs-330)
[ 0.100326] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100332] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.LPC0.EC0.M000], AE_NOT_FOUND (20180531/psargs-330)
[ 0.100336] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100343] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.LPC0.EC0.M049], AE_NOT_FOUND (20180531/psargs-330)
[ 0.100347] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100353] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.LPC0.EC0.M280], AE_NOT_FOUND (20180531/psargs-330)
[ 0.100357] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100364] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.LPC0.EC0.M009], AE_NOT_FOUND (20180531/psargs-330)
[ 0.100369] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100372] ACPI Error: Skipping While/If block (20180531/psloop-594)
[ 0.100378] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.LPC0.EC0.M000], AE_NOT_FOUND (20180531/psargs-330)
[ 0.100383] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100390] ACPI Error: Cannot release Mutex [QMUX], not acquired (20180531/exmutex-359)
[ 0.100394] ACPI Error: Ignore error and continue table load (20180531/psobject-604)
[ 0.100402] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.GPP2.BCM5], AE_NOT_FOUND (20180531...

[mprotic (mprotic)]

This seems to be finally fixed by 1.15 firmware on Acer A315 41G.

Everything works, can boot without kernel params, suspend and function keys works and powertop is down to ~7W idle (used to be ~14w) with 3+ hours of battery time.

GRUB is slow, but it is just a minor annoyance.

[Pavel (pkzm)]

Confirm that the update to 1.15 has fixed it all, touchpad included. GRUB is indeed slow but no big deal.

[Pavel (pkzm)]

Touchpad again stopped working, "disappeared" from the xinput list on kernel upgrade to 5.0.0-27. Works again when reverted to 5.0.0-25.

[Vladimir (logxx)]

So, how is it, guys? Have you noticed any downsides with 1.15 BIOS in linux? Do you still use ivrs and aspm stuff?

[Ulf Dellbrügge (ulf-dellbruegge)]

So far it has been quite good. Some report a "slow grub". Sometimes I have to reboot because no wifi card detected.

[jackysen422 (jackysen422-linux-kernel-bugs)]

I was trying another kernel parameters and noapic seems to work. It is not needed to disable the whole ACPI "service" https://www.icrwatch.com/
, however I don't know how important apic is. On kernel 4.18 even temperature sensors appear.

[erikjohansson (erikjohansson-linux-kernel-bugs)]

(In reply to jacky from comment #229)
> I was trying another kernel parameters and noapic seems to work. It is not
> needed to disable the whole ACPI "service"
> , however I don't know how important apic is. On kernel 4.18 even
> temperature sensors appear.
You should update your bios to v1.15 after that you don't need any overrides.
After that you can remove the noapic since it isn't needed.
Please don't post spam links.

[Ulf Dellbrügge (ulf-dellbruegge)]

I tested MX Linux for the past weeks and it was stable as a whole, but WLAN, bluetooth and USB often dissapeared for no reason and forced me to reboot.

[at479935 (at479935-linux-kernel-bugs)]

Nice post. I learn something totally new and challenging on blogs I stumbleupon on a daily basis.https://techbaby.pro/err_cache_miss/ It's always exciting to read articles from other writers and use something from their sites.

[Ulf Dellbrügge (ulf-dellbruegge)]

Any experiences with other distributions in the last months? Especially regarding stability? WLAN and Bluetooth work all the time? USB devices always show up when you connect them? I could really use some feedback about your choosen / favorite distribution on this notebook after patch 1.15.
Warm regards
Ulf

[Ulf Dellbrügge (ulf-dellbruegge)]

I found that suspend/hibernate are trouble. But specially KDE/Plasma is problematic. While Manjaro Plasma refuses to work, Manjaro i3 gives Suspend (to Disk, assume) out of the box. Everything else so far is working very good.

Another observation: Monitor flickering occurs when Power is connected and brightness ist 100%. switchinng it 1-2 times darker prevents flickering.

[siyia (siyia)]

I use manjaro + wayland/sway, the only custom things i did are:

1)added my user to video power and input groups
2)disabled some devices from being able to wake the laptop from suspend at /proc/acpi/wakeup

No screen flickering and suspend seems to work

[arlenestewart919 (arlenestewart919-linux-kernel-bugs)]

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[andreagonzalez4254 (andreagonzalez4254-linux-kernel-bugs)]

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[Ecker Sandor (esanya)]

I have a Acer Aspire A315, and I was glad that the BIOS 1.15 fixed the problems with the boot, and the WA kernel parameters were not needed anymore. But now I have I have the next problem:

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1861925

Is this known for you?

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

Btw, the new bios 1.17 is out guys

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

Is someone up to test it?

[eutychios23 (eutychios23-linux-kernel-bugs)]

I did test it, works fine, only issue is that the boot loader and bios menu still being laggy since 1.15v bios, its like there is no graphical acceleration, but after boot evgerything works flawless on any linux.

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

Quite sad, so are there any changes at all?

[eutychios23 (eutychios23-linux-kernel-bugs)]

I noticed faster wake from suspend, but nothing game-changing.

[Ulf Dellbrügge (ulf-dellbruegge)]

There is a chance that this also helps with the resume/suspend bug with kde/plasma. If anyone can test, that would be awesome. I will try myself as soon as possible.

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

Guys, can you tell please how do you update bios? Maybe the sluggishness of bios/grub is caused by one of methods? Cuz some people aren't experiencing it

[eutychios23 (eutychios23-linux-kernel-bugs)]

I booted this https://toolslib.net/downloads/viewdownload/255-winpese-x64/ from a usb drive and loaded the bios from another usb storage to update.

[eutychios23 (eutychios23-linux-kernel-bugs)]

i also used woesb to burn the win10 iso mentioned above in a flash drive

[siyia (siyia)]

If you get screen flickering at 100% backlight add "acpi_backlight=video"
and update-grub it seems to resolve the problem.

[siyia (siyia)]

Ignore my previous comment, the previous parameter fixes the issue but disables manual back-light control, instead use these in grub cmd: "acpi_osi='Windows 2018' acpi_backlight=vendor"
and sudo update-grub.

They fix the issue while retaining control of the back-light via the fn keys.

[eutychios23 (eutychios23-linux-kernel-bugs)]

Hello if you have problems with screen flickering at 100% backlight brightness
Add: acpi_osi='Windows 2018' acpi_backlight=vendor
in grub boot parameters&update-grub&restart
it totally fixes the issue

[erikjohansson (erikjohansson-linux-kernel-bugs)]

There's a new bios (1.18) out

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

How is it?

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

btw, do you also have lowres screen while updating bios? it used 1920*1080 before, but now it's like 800*600

[Ulf Dellbrügge (ulf-dellbruegge)]

I still get freezes when resuming from suspend when using kde and opengl as a compositor, but this is not related to this issure, or is it?

[siyia (siyia)]

For crashes after suspend add: rcu_nocbs=0-N(number of cores -1) and idle=nowait as grub parameters update-grub and reboot you also need 5.4 or higher.

[siyia (siyia)]

For crashes after suspend add: rcu_nocbs=0-N(number of cores -1) and idle=nowait as grub parameters update-grub and reboot you also need kernel 5.4 or higher with latest stable firmware.

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

lol, somehow i can see recent messages in launchpad, but not there...

[vladimir220022 (vladimir220022-linux-kernel-bugs)]

haha, it seems it blinks even not on max brightness while charging (didn't use your workaround).

[eutychios23 (eutychios23-linux-kernel-bugs)]

Add: acpi_osi='Windows 2018' acpi_backlight=vendor

in grub boot parameters&update-grub&restart

and use kernel 5.4,for me it doesnt blink at all i've tested thoroughly.Laptop was always charged while tested though.

[eutychios23 (eutychios23-linux-kernel-bugs)]

Just an update:

If you get freezes in newer debian/ubuntu distros, it is necesarry to downgrade to
bios v1.13, for me it is the most stable bios for this acer-aspire-a315-41g.
It also gets rid of the laggy bios/grub menu. If you need assistance in downgrading
contact me, however if your laptop works perfectly with latest bios there is no need
to risk with this.

[siyia (siyia)]

Just an update:

If you get freezes in newer debian/ubuntu distros, it is necesarry to downgrade to
bios v1.13, for me it is the most stable bios for this acer-aspire-a315-41g.
It also gets rid of the laggy bios/grub menu. If you need assistance in downgrading
contact me, however if your laptop works perfectly with latest bios then there is no need
to risk with this.

[mprotic (mprotic)]

I can confirm that downgrade to bios 1.13 definitively solves freezing problem (was drastic on 1.18) and also grub slowness. After revert to 1.13, everything is now super stable.

Firmware downgrade, though, is not straightforward, here is procedure

https://community.acer.com/en/discussion/599232/a315-41g-1-17-bios-bootloop/p2

Thank you @siyia, f**k you Acer.