Re: commit 7ffb791423c7 breaks steam game

[Bert Karwatzki]

Am Samstag, dem 15.03.2025 um 00:34 +1100 schrieb Balbir Singh:
> On 3/14/25 17:14, Balbir Singh wrote:
> > On 3/14/25 09:22, Bert Karwatzki wrote:
> > > Am Freitag, dem 14.03.2025 um 08:54 +1100 schrieb Balbir Singh:
> > > > On 3/14/25 05:12, Bert Karwatzki wrote:
> > > > > Am Donnerstag, dem 13.03.2025 um 22:47 +1100 schrieb Balbir Singh:
> > > > > >
> > > > > >
> > > > > > Anyway, I think the nokaslr result is interesting, it seems like with nokaslr
> > > > > > even the older kernels have problems with the game
> > > > > >
> > > > > > Could you confirm if with nokaslr
> > > > > >
> > > > > Now I've tested kernel 6.8.12 with nokaslr
> > > > >
> > > > > > 1. Only one single game stellaris is not working?
> > > > > > 2. The entire laptop does not work?
> > > > > > 3. Laptop works and other games work? Just one game is not working as
> > > > > expected?
> > > > >
> > > > >
> > > > > Stellaris is showing the input lag and the entire graphical user interface shows
> > > > > the same input lag as long as stellaris is running.
> > > > > Civilization 6 shows the same input lag as stellaris, probably even worse.
> > > > > Magic the Gathering: Arena (with wine) works normally.
> > > > > Valheim also works normally.
> > > > > Crusader Kings 2 works normally
> > > > > Rogue Heroes: Ruins of Tasos (a Zelda lookalike) works normally.
> > > > > Baldur's Gate I & II and Icewind Dale work normally.
> > > > >
> > > > > Also the input lag is only in the GUI, if I switch to a text console (ctrl + alt
> > > > > + Fn), input works normally even while the affected games are running.
> > > > >
> > > > > Games aside everything else (e.g. compiling kernels) seems to work with nokaslr.
> > > > >
> > > >
> > > > Would it be fair to assume that anything Xorg/Wayland is working fine
> > > > when the game is not running, even with nokaslr?
> > > >
> > > Yes, Xorg (I'm normally using xfce4 as desktop) works fine. I also tested with
> > > gnome using Xwayland, here the buggy behaviour also exists, with the addtion
> > > that mouse position is off, i.e. to click a button in the game you have to click
> > > somewhat above it.
> >
> > So the issue is narrowed down to just the games you've mentioned with nokaslr/patch?
> >
> > >
> > > > +amd-gfx@xxxxxxxxxxxxxxxxxxxxx to see if there are known issues with
> > > > nokaslr and the games you mentioned.
> > > >
> > > >
> > > > Balbir Singh
> > > >
> > > > PS: I came across an interesting link
> > > > https://www.alex-ionescu.com/behind-windows-x64s-44-bit-memory-addressing-limit/
> > > >
> > > > I think SLIST_HEADER is used by wine as well for user space and I am not sure
> > > > if in this situation the game is hitting this scenario, but surprisingly the other
> > > > games are not. This is assuming the game uses wine. I am not sure it's related,
> > > > but the 44 bits caught my attention.
> > >
> > > Stellaris is a native linux game (x86_64), the one game (MTGA) I tested with
> > > wine worked fine.
> > >
> >
> > Thanks for the update! I wonder if there are any game logs. If you can look for any
> > warnings/errors it might be interesting to see where the difference is coming from?
> >
>
> In addition to the above, does radeontop give you any info about what might be
> going on? I am also curious if

This got me to test stellaris and Civ6 using the discrete Graphics card:
03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 23
[Radeon RX 6600/6600 XT/6600M] (rev c3)
 (with DRI_PRIME=1) and here the problems do not occur.

This is the CPU-builtin GPU, which I normally use to play stellaris as graphics
aren't very demanding, here the problems occur when using nokaslr
08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c5)

> nokaslr and pci=nocrs works for you?

pci=nocrs does not change the situation.

> Balbir

Bert Karwatzki