On 2017-07-17 08:21, Stéphane Ancelot wrote:

If you don't manage to achieve realtime, you have some wrong options in
your kernel settings .

I do achieve real-time (stable, low-enough latency), but it doesn't last.


On 2017-07-17 08:31, Piotr Gregor wrote:

Just to clarify: does the laptop works fine with other, non-rt-patched kernel?

Yes.

If yes, couldn't you copy existing config from /boot and make oldconfig based on that? 

I have not done exactly that – I have added the RT patch and
CONFIG_PREEMPT_RT_FULL option (with dependencies) to the package source
from which the original kernel was built.

I can try the 'make oldconfig' with a working non-rt kernel config next
time, but I won't be able to do that in the next week.

You may have to do some tricks to get GUI with reasonable graphics though
but this should give you runnable, stable system.

I use GUI applications, rely on working OpenGL. Graphics is 'reasonable'
as long as the system is stable, but sooner or later it locks-up/crashes.

Here are two of the kernel configs I have tried:

https://gist.github.com/Jajcus/9af258ae55555afb126537e42d697d76


I suspect some firmware/hardware related thing which triggers the problem.


BIOS Information
        Vendor: Insyde Corp.
        Version: V1.25
        Release Date: 03/03/2017

System Information
        Manufacturer: Acer
        Product Name: Aspire E5-575
        Version: V1.25

Base Board Information
        Manufacturer: Acer
        Product Name: Ironman_SK
        Version: V1.25

CPU: Intel(R) Core(TM) i5-6267U CPU @ 2.90GHz

lspci:
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM
Registers (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Iris Graphics 550
(rev 0a)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI
Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP
Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP
Serial IO I2C Controller #0 (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI #1 (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA
Controller [AHCI mode] (rev 21)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root
Port (rev f1)
00:1d.2 PCI bridge: Intel Corporation Device 9d1a (rev f1)
00:1d.3 PCI bridge: Intel Corporation Device 9d1b (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller
(rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
02:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless
Network Adapter (rev 31)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTL8411B PCI Express Card Reader (rev 01)
03:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)


Jacek