Re: commit 7ffb791423c7 breaks steam game

[Alex Deucher]

On Fri, Mar 14, 2025 at 8:42 PM Balbir Singh <balbirs@xxxxxxxxxx> wrote:
>
> On 3/15/25 01:18, Bert Karwatzki wrote:
> > 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)
> >
>
> Aaah.. this is strange, because the only movement in iomem was for the discrete GPU
>
> From your eariler message
>
>  fee00000-fee00fff : pnp 00:04
>  ff000000-ffffffff : pnp 00:04
>  100000000-fee2fffff : System RAM
> -  3a7e00000-3a89d2f56 : Kernel code
> -  3a8a00000-3a8e31fff : Kernel rodata
> -  3a9000000-3a912a5ff : Kernel data
> -  3a969c000-3a97fffff : Kernel bss
> +  d32200000-d32dd0f56 : Kernel code
> +  d32e00000-d33231fff : Kernel rodata
> +  d33400000-d3352a5ff : Kernel data
> +  d33a9c000-d33bfffff : Kernel bss
>  fee300000-100fffffff : Reserved
>  1010000000-ffffffffff : PCI Bus 0000:00
>    fc00000000-fe0fffffff : PCI Bus 0000:01
> @@ -104,4 +104,4 @@
>        fe30300000-fe303fffff : 0000:04:00.0
>      fe30400000-fe30403fff : 0000:04:00.0
>      fe30404000-fe30404fff : 0000:04:00.0
> -3ffe00000000-3fffffffffff : 0000:03:00.0
> +afe00000000-affffffffff : 0000:03:00.0
>
> I am hoping someone from amd-gfx to chime in with known issues of the driver
> and nokaslr or help debug further.

I'm not aware of any problems with nokalr off hand with AMD GPUs.

Alex