Lumen GI on Rog Ally broken in UE5 games

[AldoCalrissian]

Hey guys, so I have been tracking this issue for a little while now and decided to make this post to make everyone aware of it.

I started to notice that UE5 titles on the Rog Ally can look really awful when compared to the exact same settings on any other device (including steam deck) .

I Have narrowed it down to the fact that Lumen global illumination just does not appear to work on the Rog Ally in any UE5 game. (driver bug?) I first noticed it in RoboCop: Rogue City, assumed it was just a bug in that game. Then again in Still wakes the deep. And since then I have been checking out as many UE5 games as I can on the ROG. It seems to Happen in every UE5 game on the Ally, with the exception being the few rare games you can disable Lumen GI in the options. Fortnight you can disable it and Silent Hill 2 remake you can enable full hardware ray-tracing for a pretty expensive fix for example.

This bug happens every time and on every Rog Ally, I have compared my experience with YouTube game play videos of the same levels and they all exhibit the same GI bug in videos dating back to the Rog Ally launch (so its not a new bug). I also discovered it affects the Legion Go too. so more a Z1E/780M issue rather than just a Rog Ally issue.

Anyway here are a few screenshot examples of what the bug looks like in action. It mainly affects indoor areas so its visual impact will vary from game to game and level to level. You can really see how drastically this can alter the appearance of game. and as more and more games are coming out now on UE5 I'm guessing more people will start to notice it. I'm already seeing more and more "lighting looks crap in X game on Ally" posts in various places.

hopefully if more people discover and speak out about this bug it can be fixed in a driver update.

Still Wakes the deep Desktop GPU

Still wakes the deep same settings on rog Ally

Robocop Medium Settings desktop

RoboCop Same Settings - Rog Ally

Wukong desktop medium settings

Wukong same settings Rog Ally

[Legionkin]

need to apologize i thought i was in a thread for the more recently released device.

[TristanRW]

Still could apply if it has the same issue and its a driver issue.

[Legionkin]

guess were gona need a new driver that does not overkill battery life

[AldoCalrissian]

You would think that Asus latest flagship handheld the Ally x being incompatible with one of the most popular game engines (unreal engine 5). Would warrant some kind of response or acknowledgement from ASUS/Mods? no?

[Legionkin]

They often work behind the scene's unless needed speak up.
I have also over reacted in the past.
They are improving things as they go.
A lil like buying a intel gpu, it gets better over time.

[K_Y]

Unfortunately, my life experience tells me that nothing will be fixed, and we will be left alone with our problems. At least, I have long been accustomed to this attitude of service providers or government bodies. They sold us a product, and then it is no longer their problem. In principle, my words are confirmed by the fact that the problem has existed for at least a year, and nothing has been fixed. Of course, one can hope, but I expect that nothing will be fixed.

[Legionkin]

gona stop you right there.
the device is still very new, teething problems will exist.

i do feel asus can slow down a bit and put more time into testing.
you are expecting a lot from a device this light.
and i have over time only seen my rog ally X improve.
this is nothing more than a shader work around that may even be too harsh on the hardware.

i am sure 100% asus are looking into it.
and i would not eat anything linus tech tips or nexus gamers says.. i know who sponsors them XD
clowns sponsor them... give it some time.
drivers may come.

[AldoCalrissian]

This bug applies to the OG Ally Z1 and Z1E also. The OG ally has been out now for over a year and this lumen GI bug has been present since day one.  So sorry no its not just a teething problem. Now Asus may be hard at work on an update they may not. But it would take 30 seconds for them to say "hey we are aware of the issue" 

[AldoCalrissian]

I would also note that lumen GI displays correctly on the steam deck and if you run install Bazzite on the Ally lumen GI works as intended and performance is as expected. So we already know exactly what the hardware is capable of and needn't speculate, your assertion that this is "nothing more than a shader work around that may even be too harsh on the hardware" is pure incorrect speculation.  

[Legionkin]

That is correct.
I am speculating, but i don't thin asus will ignore such a issue.
I have had good support from them.
I have no issue with the steam deck I think it also is a nice device but honestly don't like supporting steam's rude and lazy moderation staff.
if Valve could break your games and device intentionally they would do so in spite.
the only reason i did not take a steam deck is their attitude.