Thank you David, I kept i8042 in RTIRQ_NAME_LIST because it was present in the default configuration of rtirq. I have now removed it from RTIRQ_NAME_LIST, but the situation doesn't seem to have changed. Shared memory: I don't know how to find it, could you please tell me how to check it out? Here is the lspci for the video interface: 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])     Subsystem: ASUSTeK Computer Inc. 4th Gen Core Processor Integrated Graphics Controller     Flags: bus master, fast devsel, latency 0, IRQ 36     Memory at f7400000 (64-bit, non-prefetchable) [size=4M]     Memory at d0000000 (64-bit, prefetchable) [size=256M]     I/O ports at f000 [size=64]     [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]     Capabilities: <access denied>     Kernel driver in use: i915     Kernel modules: i915 01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 850M] (rev a2)     Subsystem: ASUSTeK Computer Inc. GM107M [GeForce GTX 850M]     Flags: bus master, fast devsel, latency 0, IRQ 255     Memory at f6000000 (32-bit, non-prefetchable) [size=16M]     Memory at e0000000 (64-bit, prefetchable) [size=256M]     Memory at f0000000 (64-bit, prefetchable) [size=32M]     I/O ports at e000 [size=128]     Expansion ROM at f7000000 [disabled] [size=512K]     Capabilities: <access denied>     Kernel modules: nouveau Il 23/08/20 06:35, David W. Jones ha scritto: > I don't know about the rest of the settings, but why is i8042 (PS/2 > keyboard/mouse controller) on the RTIRQ_NAME_LIST? > > Does the laptop use shared system memory for video? > > On August 22, 2020 12:29:58 PM HST, Nicola Pandini > &lt;nicola.pandini(a)gmail.com&gt; wrote: > > Hello list! > I have a setup that I use in my live sets made with an ASUS N551 laptops > and a NI Komplete Audio 6, which allows me to play without XRUNS at 64 > frames / period with a modular approach (Qtractor, LinuxSampler, > Yoshimi, SooperLooper, PureData). > The whole thing runs on Debian Stretch with AVLinux 4.9.47-rt37avl2 kernel. > I am quite happy with the performance of this setup, but I started > having XRUNS when I added real-time video management as well. Those > issues made me notice that the system runs without XRUNS only if XOrg is > not stressed much, while it starts producing XRUNS when I play a video, > or when I open the browser, or even when I quickly move or resize a window. > > I would like to understand if the problem is due to an incorrect > configuration of realtime priorities, or to something that I have not > yet managed to trap. > > I currently use these configurations: > > [Xorg] > The video driver is i915. > I read on the internet that: > "If your graphic card was manufactured in 2007 and newer, try > uninstalling the xserver-xorg-video-intel package and use the builtin > modesetting driver (xserver-xorg-core) instead" > Questions: > - I uninstalled xserver-xorg-video-intel, but I still see the i915 > driver: is that correct, or should I see another driver? > > [rtirq] > RTIRQ_NAME_LIST = "snd usb i8042" > RTIRQ_PRIO_HIGH = 90 > RTIRQ_PRIO_DECR = 5 > RTIRQ_PRIO_LOW = 51 > RTIRQ_RESET_ALL = 0 > RTIRQ_NON_THREADED = "rtc snd" > Questions: > - rtc must be in "NON_THREADED", or in "RTIRQ_NAME_LIST"? > - in "RTIRQ_NAME_LIST" can I remove "usb" and put only the item that > manages my USB card? Should it be xhci? > - can i take i8042 off the list? > - is it recommended to use RTIRQ_RESET_ALL = 1 to override all other IRQs? > > [jackd] > jackd -P83 -dalsa -dhw: K6 -r44100 -p64 -n2 -I1 > Questions: > - the priority must be lower than those that are set to the IRQs by rtirq? > > [limits.conf] > @audio - rtprio 99 # maximum realtime priority > @audio - memlock unlimited # maximum locked-in-memory address space (KB) > Questions: > - what is the recommended value of rtprio in 2020? On the internet I > find 90, 95 and 99 > > Can you help me do a checkup of my configuration? > > Thanks! > > ------------------------------------------------------------------------