What’s Going Wrong in One UI 8 and 8.5?
Samsung’s One UI 8 bugs are a pair of software issues affecting Galaxy phone gaming in DeX Mode and the look of dark mode in popular apps, causing controllers to partially fail and app themes to appear inconsistent until users apply specific workarounds or install the One UI 8.5 fix on supported devices. One UI 8 introduced a rebuilt DeX Mode, created with Google, that made the desktop-like experience smoother but also triggered a controller problem when the phone’s screen turned off. One UI 8.5 then corrected that gaming issue, but introduced a separate dark mode glitch, especially in Google apps, where black, dark gray, and light gray elements now mix in a distracting way. Together, these problems show how big interface updates can improve features and still introduce new bugs when they are not tested thoroughly across real-world hardware and app combinations.
DeX Mode Controller Bug: What It Is and Who It Affects
On One UI 8, a major bug hits the Galaxy phone gaming controller experience when using DeX Mode on an external display. When the connected phone’s screen shuts off, wireless gamepads such as an Xbox One controller lose their analog sticks, while face buttons and menu keys keep working. This breaks precise movement in games and makes couch gaming far less comfortable, even though keyboard and mouse input remains fine. According to Android Authority, several Galaxy owners have reported the same behavior on Reddit over the past eight months. The issue matters most if you use DeX Mode for emulation, streaming services, or controller-first Android games. Phones that are stuck on One UI 8, or that will only receive One UI 8.5 much later, are the most exposed, because they cannot rely on the native software fix yet.
How to Fix or Work Around the DeX Gaming Glitch
Samsung has acknowledged the controller problem and fixed it in One UI 8.5, where analog sticks now keep working in DeX Mode even when the phone’s display turns off. If your Galaxy device already has One UI 8.5 and the May 2026 security patch, update immediately through Settings > Software update to restore normal gamepad behavior, including for emulation. If your phone is still on One UI 8, you can apply temporary workarounds. The most common is enabling developer options, then turning on the Stay awake toggle so the screen does not sleep while the phone charges; lowering brightness can reduce burn-in risk. Another option is installing a screen-on utility app, such as BleKip, to keep the display alive during gaming sessions. These stopgaps are not ideal, but they allow you to keep using a Galaxy phone gaming controller in DeX until Samsung’s full update reaches your device.
One UI 8.5 Dark Mode Bug: Why Your Apps Look Patchy
After installing One UI 8.5, many users are finding Samsung dark mode broken in unexpected ways. Screenshots of apps show a mix of pure black sections alongside dark gray and light gray interface pieces, creating a patchwork look that defeats the point of a consistent dark theme. Reports are coming from Galaxy S25 owners and others, so the issue is not limited to one model. The bug appears mainly in Google apps and is tied to how Samsung’s new default color palette interacts with Google’s Material You theming. A Reddit user, MohamedEIngar, explains that Samsung’s palette change clashes with how Google styles its apps, causing the odd blend of tones. In one shared customer support chat, a Samsung representative mentions that the company will “update the color to a darker tone in the next update,” though this is not an official public statement.
Workarounds for Broken Dark Mode Until Samsung Ships a Patch
Until an official One UI 8.5 fix arrives, you have a few ways to make dark mode look better. Power users can turn to a forked version of the Shizuku tool, which, as described by community members, can revert the system colors to the pre–One UI 8.5 style so Google apps stop showing mismatched grays. This route requires extra setup and is best for those comfortable with advanced Android tweaking. For everyone else, the easiest workaround is changing your color palette in Settings > Wallpaper and style. Several users report that picking a different palette, or reapplying one, can temporarily smooth out dark mode, even though the result may not be perfect. You can also submit a bug report through the Samsung Members app, which increases the chances that Samsung prioritizes a stable, official dark mode patch in a future update.