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I bisected this between >>>>> v6.14-rc5 and next-20250307 and got this as the first bad commit: >>>>> >>>>> 7ffb791423c7c518269a9aad35039ef824a40adb is the first bad commit >>>>> commit 7ffb791423c7c518269a9aad35039ef824a40adb (HEAD) >>>>> Author: Balbir Singh >>>>> Date: Fri Feb 7 10:42:34 2025 +1100 >>>>> >>>>> x86/kaslr: Reduce KASLR entropy on most x86 systems >>>>> >>>>> Reverting commit 7ffb791423c7 in next-20250307 fixes the issue for me. >>>>> >>>> >>>> Thanks for the report! Could you also share the dmesg? Do you have any proprietary >>>> modules loaded? Could you also share the output of /proc/iomem (captured as sudo)? >>>> The lspci output is useful, lspci -vvv (captured with sudo) would help see where >>>> the BAR regions are, specifically before and after the patch. Could you also share >>>> the kernel config? >>>> >>>> I assume your config has CONFIG_PCI_P2PDMA enabled. Did the system ever work with >>>> nokaslr for you? >>>> >>>> I am a little surprised that reducing the entropy causes these issues and having >>>> a larger direct map causes these issues. >>> >>> Hi, Bert >>> >>> I tried to reproduce the issue at my end, but could not. I am new to Steam and my >>> hardware/games are also different. From what I could gather, Steam is a 32 bit >>> application that uses SDL. For my testing I used Xorg, not wayland >>> >>> In addition to the above? >>> >>> 1. Could you confirm if the mouse/keyboard work outside of Steam? >>> 2. Does evtest /dev/input/ show anything? >>> 3. We could run the kernel with nokaslr and see if the issue reproduces? >>> 4. As a test, we could try disabling CONFIG_PCI_P2PDMA in the kernel config, >>> build boot and test, this has the same effect has not having the patch >>> >>> Balbir >>> >> >> 1. The problem is not with steam but specifically with the game stellaris (which >> can be started without steam). As long as stellaris is running there is a ~2s >> delay in keyboard and mouse input (for everything), killing stellaris restores >> input to normal. >> 2 evtest /dev/input/event{1,3,4} (keyboard, touchpad, mouse) seems to show the >> same output whether stellaris is running or not, only if it's running there's >> the mentioned delay. Thanks, so the issue is specific to the game and running it? >> 3. For some weird reason my kernel does not recongnize the nokaslr cmdline >> parameter, so I build a kernel without CONFIG_RANDOMIZE_BASE and this does NOT >> fix the issue. Can you clarify if you're booting with the compressed image bzImage/vmlinuz or with vmlinux? >> 4. Most surprisingly removing CONFIG_PCI_P2PDMA also does NOT fix the issue. >> > > I've done more experimenting regarding 4.: > next-20250307 with "CONFIG_RANDOMIZE_BASE=y" AND "CONFIG_PCI_P2PDMA is not set" > works as expected (i.e. no input lag when stellaris is running) > > next-20250307 with "CONFIG_RANDOMIZE_BASE is not set" AND "CONFIG_PCI_P2PDMA is > not set" also shows the buggy behaviour (i.e. input lag when stellaris is > running) (this was the configuration I tested before) This is an interesting experiment, I am beginning to wonder if the system relies on a reduced direct map for the game to work correctly. Can you also check in this scenario if CONFIG_RANDOMIZE_MEMORY is disabled? Can you please share the dmesg 1. output before and after the changes? 2. Do you see any warnings/errors in journalctl or game specific log files? 3. lspci -vvv output before and after the changes? > > As a sidenote, I've tested several kernel with nokaslr as command line parameter > (6.1.128, 6.8.12, 6.12.17 (the debian sid distributional kernel)) and nokaslr is > not recognized as a command line parameter in any of them > Please see my comment above about booting. How did you check if nokaslr is being recognized, is it via looking up dmesg? Thanks! Balbir Singh